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WO1997050145A1 - FILTRES, BANCS DE FILTRES ET MULTIPLEXEURS SUPRACONDUCTEURS DE GRANDE PUISSANCE, A HAUTE TEMPERATURE ET A MODE TM¿0i0? - Google Patents

FILTRES, BANCS DE FILTRES ET MULTIPLEXEURS SUPRACONDUCTEURS DE GRANDE PUISSANCE, A HAUTE TEMPERATURE ET A MODE TM¿0i0? Download PDF

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Publication number
WO1997050145A1
WO1997050145A1 PCT/US1996/010952 US9610952W WO9750145A1 WO 1997050145 A1 WO1997050145 A1 WO 1997050145A1 US 9610952 W US9610952 W US 9610952W WO 9750145 A1 WO9750145 A1 WO 9750145A1
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WO
WIPO (PCT)
Prior art keywords
high temperature
filter
temperature superconductor
resonators
mode
Prior art date
Application number
PCT/US1996/010952
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English (en)
Inventor
Zhi-Yuan Shen
Original Assignee
E.I. Du Pont De Nemours And Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by E.I. Du Pont De Nemours And Company filed Critical E.I. Du Pont De Nemours And Company
Priority to PCT/US1996/010952 priority Critical patent/WO1997050145A1/fr
Publication of WO1997050145A1 publication Critical patent/WO1997050145A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/203—Strip line filters
    • H01P1/20327—Electromagnetic interstage coupling
    • H01P1/20354—Non-comb or non-interdigital filters
    • H01P1/20381—Special shape resonators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/213—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies
    • H01P1/2135—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies using strip line filters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/08—Strip line resonators
    • H01P7/082—Microstripline resonators

Definitions

  • a filter is a frequency selecting device, which allows radiofrequency signals within its passing band to pass through and rejects the radiofrequency signals outside its passing band.
  • Filter banks and multi ⁇ plexers consist of a series of filters in parallel, each having different passing bands to divide or combine radiofrequency signals having different frequencies.
  • Filters are the basic components of filter banks and multiplexers. Filters, filter banks and multiplexers are widely used in electronic systems for selecting and channeling radiofrequency signals.
  • the basic electrical performance requirements of a filter are: defined bandwidth, low in-band insertion loss, high off-band rejection, and sharp skirts.
  • a conventional planar high temperature super ⁇ conductor filter such as described in J. A. Curtis and S. J. Fiedziuszko, "Miniature dual mode microstrip filters," 1991 IEEE MTT-S International Microwave Symposium Digest, Vol. 2, pp. 443-446, June, 1991, and shown in Figures 1 (a) and 1 (b) consists of a series of high temperature superconductor resonators 3 in a two dimensional planar pattern deposited on one side of a substrate 1 with the other side of the substrate coated with high temperature superconductor film as a ground plane.
  • Such planar high temperature superconductor filters are compact, which renders them suitable for making filter banks or multiplexers.
  • the square high temperature superconductor resonator of Figure 1 (a) and Figure 1 (b) is operating at TM 10 mode (herein the first and the second subscripts represent the mode indexes along the x-direction and the y-direction, respectively) with the radiofrequency current distribution described by equation (1) as follows:
  • J x means that the current of the TM 10 mode in the square resonator flows only along the x direction as shown in Figure 1 (a) .
  • the current distribution J x (x) as a function of x and J x (y) as of a function of y are also shown in Figure 1(a) .
  • J x (x) has a peak at x - a/2.
  • the length of the square edge is defined as a.
  • the J x (y) distribution is due to the concentrated magnetic field (H-field) wrap-around at the edges of the high temperature superconductor resonator 3 as shown by arrows 5 in the cross sectional view of Figure 1(b) .
  • the J x (y) function has very sharp peaks, therefore, the ratio R of the peak value to the average value is very large (R is much greater than 10) .
  • the power handling capability is restricted by the maximum current density value, Jmax, determined by the current peaks which must be below the J c (critical current density) of the high temperature superconductor material .
  • the power handling capability is increased by reducing the maximum current density, Jmax r i.e. by reducing the ratio R. Since the sinusoidal distribution of J x (x) has only a small R, and J x (x) distribution is intrinsic due to the standing wave nature of the resonance, attention is naturally focused at the J x (y) distribution which has a very large R value which is not intrinsic.
  • the power handling capability is determined by two factors: (1) the resonators and (2) the coupling circuits.
  • the power handling capability of the coupling circuits can be improved by back-side coupling circuits described in copending commonly assigned patent application Serial No. (Attorney
  • a coupling circuit wherein the improvement comprises substantial confinement of the magnetic field between the patterned high temperature superconductor film and the ground plane at an operating mode of TM 0i0 wherein i is an integer of at least 1.
  • the resonators are in the shape of a circle or a symmetrical polygon. Use of any conventional coupling circuit is appropriate.
  • the present invention further comprises an improved multiplexer comprising
  • each said filter comprising: (i) at least two resonators, each comprising a patterned high temperature superconductor film deposited on one side of a substrate;
  • Figure 1 shows a prior art square high temperature superconductor resonator.
  • Figure 1(a) shows the front view, in which the radiofrequency current distribution (arrows) is depicted. The distribution along the x and y directions is also shown.
  • Figure 1(b) shows a cross sectional view of the resonator, in which the radiofrequency magnetic field distribution (arrows) is depicted.
  • Figure 2 shows the round high temperature super- conductor resonator of the present invention operating at TM 010 mode, which is used as a basic building block for the high power filters of the present invention.
  • Figure 2 (a) shows the front view, in which the radiofrequency current distribution (arrows) and the radiofrequency magnetic field distribution (dashed circles) are depicted.
  • Figure 2(b) shows a cross sectional view of the resonator, in which the radiofrequency magnetic field distribution (arrows) is shown.
  • Figure 3 shows the radiofrequency current (arrows) and radiofrequency magnetic field (dashed circles) distribution patterns and the current density function variation along the radial direction of three modes.
  • Modes TMQ 10 , TM 020 ' and TM 0 3 0 ' are shown in Figure 2(a), Figure 2(b), and Figure 2(c), respectively. These modes can be used in the high power high temperature superconductor filters of the present invention.
  • Figure 4 shows an example of a 2-pole circular shaped TM 010 mode high temperature superconductor filter of the present invention in the microstrip line form with front-side coupling.
  • Figure 4(a), Figure 4(b), and Figure 4(c) show the front view, the back view, and the cross sectional view of the filter circuit, respectively.
  • Figure 5 shows an example of a 2-pole circular shaped TM 010 mode high temperature superconductor filter of the present invention in the microstrip line form with back-side coupling.
  • Figure 5(a), Figure 5(b), and Figure 5(c) show the front view, the back view, and the cross sectional view of the filter circuit, respectively.
  • Figure 6 shows an example of a 2-pole circular shaped TM 010 mode high temperature superconductor filter of the present invention in the microstrip line form with a combination of the front-side coupling and the back-side coupling.
  • Figure 6(a), Figure 6(b), and Figure 6(c) show the front view, the back view, and the cross sectional view of the filter circuit, respectively.
  • Figure 7 shows a 2-pole circular shaped TM 010 mode high temperature superconductor filter of the present invention with front-side coupling similar to that shown in Figure 4, except radial slots are provided in the high temperature superconductor resonators to suppress interference modes.
  • Figure 7(a), Figure 7(b), and Figure 7 (c) show the front view, the back view, and the cross sectional view of the filter circuit, respectively.
  • Figure 8 shows an example of a TM 010 mode 2-pole high temperature superconductor high power filter of the present invention in the microstrip line form with back-side coupling similar to that shown in Figure 5, except that the two circular shaped high temperature superconductor resonators are replaced by two octagon shaped high temperature superconductor resonators .
  • Figure 8(a), Figure 8(b), and Figure 8(c) show the front view, the back view, and the cross sectional view of the filter circuit, respectively.
  • Figure 9 shows a 2-pole circular shaped TM 010 mode high temperature superconductor filter of the present invention similar to that shown in Tigure 4, except that it is in the strip line form.
  • Figure 9(a), Figure 9(b), and Figure 9(c) show the front view, the back view, and the cross sectional view of the filter circuit, respectively.
  • the purpose of this invention is to build compact planar high temperature superconductor filters with very high power handling capability.
  • Resonators are the main components of filters.
  • the key to increasing the power handling capability of the planar high temperature superconductor filters is to increase the power handling capability of the planar high temperature superconductor resonator. As used herein, the following terms have the stated definitions.
  • “Substantial” means greater than 90%, preferably greater than 95%, most preferably greater than 98%.
  • Symmetrical polygon means a polygon of at least six sides wherein all sides are of equal length and all angles are equal .
  • the circular shaped high temperature superconductor resonator 12 is deposited on the front surface of a substrate 10 as shown in Figure 2(a) .
  • Figure 2(b) the back side of substrate 10 is coated with high temperature superconductor thin film 11 serving as the ground plane of the resonator 12.
  • the TM 010 mode current 13 is shown in Figure 2(a) by the arrows.
  • the H-field 14 magnetic field distribution
  • the TM 010 mode is not the only one which provides high power handling capability and can be used in the present invention.
  • a circular shaped resonator there is a series of modes having a circular H-field confined between the resonator and the ground plane and without the wrap-around H-field which causes sharp current peaks which are suitable for use in the present invention.
  • the first subscript of 0 represents the mode index in the azimuthal direction.
  • the third subscript 0 represents the mode index in the axial direction perpendicular to the surface of the resonator.
  • 10 is the substrate
  • 12 is the resonator comprising a high temperature super- conductor circular pattern
  • 13 (white arrows) depicts the current distribution
  • 14 dashex-field distribution
  • the distribution functions of current density J p and the H-field H* along the radial direction, p, for the TM 010 ,- TM 020 , and TM 030 modes are the Bessel functions, J x (p), J 2 (p), and J 3 (p), respectively, which are shown in the curves below the corresponding resonators in Figures 3 (a) , 3(b) and 3(c), respectively. All of these modes have the same previously described feature, i.e. the circular H-field is confined within the circle and there is no wrap-around H-field and no sharp current peaks at the edge.
  • f 0 ⁇ is the resonant frequency of the TM 0 io mode
  • c is the speed of light in free space
  • D is the diameter of the circular resonator
  • r L is the ith root of the Bessel function J ⁇ (r i ) as shown in equation (2.b) .
  • the resonant frequency, f 0 A increases monotonically with increasing mode index, i.
  • the diameter, D, of the circular resonator increases monotonically with increasing mode index, i. Therefore, for low frequency compact filters, the lowest TM 0i0 mode, i.e. the TM 010 mode, is preferred due to its small size.
  • selecting a higher mode such as TM 020 ' or TM 03 0 nas tne advantage of avoiding small sized patterns and having strict manufacturing tolerances.
  • This invention also comprises a high temperature superconductor filter operating at TM 0i ⁇ mode (i - 1, 2, 3, • • • ) having a symmetrical polygon shaped resonator with the number of sides, n, being at least six, preferably greater than about eight. Symmetry means that all the side lengths are equal and all the angles in the polygon are equal.
  • TM 0i ⁇ mode i - 1, 2, 3, • • •
  • n symmetrical polygon shaped resonator with the number of sides, n, being at least six, preferably greater than about eight. Symmetry means that all the side lengths are equal and all the angles in the polygon are equal.
  • Such symmetrical polygonal high temperature superconductor resonators have features similar to the circular one previously described.
  • the resonant frequencies of such TM 0i0 symmetrical polygon resonators can also be approximately calculated by using equations (2.a) and (2.b), where in this case, D is the distance between
  • the TM 0i0 mode (i - 1 , 2 , 3, • • • ) symmetrical polygon shaped resonators also can be used as components of the high power high temperature super ⁇ conductor filters, filter banks, and multiplexers of the present invention.
  • Both the microstrip line form and the strip line form high temperature superconductor resonators can be used in the high power high temperature superconductor filters, filter banks, and multiplexers.
  • Figure 4 shows an embodiment of the high power high temperature superconductor filter of the present invention in the microstrip line form.
  • FIG. 4(a) shows the front view, in which 22a, 22b are the two TM 010 high temperature superconductor resonators deposited on substrate 20.
  • the input and output coupling circuits comprise two branched high temperature superconducting transmission lines, and include: high temperature superconductor center transmission lines 23a for the input and 23b for the output, and extended branched center transmission lines 24a and 24b for the input and output, respectively.
  • 24a and 24b are configured in an arc shape, which matches the circumferential edges of the resonators 22a and 22b.
  • the arc shape spreads the electromagnetic fields over a large area for high power handling and also for exciting the azimuthally symmetrical electromagnetic fields more uniformly for the TM 010 mode.
  • the interconnecting coupling circuit for coupling between resonators is transmission line 25 which in this particular case is configured in a double arc form for the same reasons.
  • the coupling strength of these circuits can be adjusted by varying the length and width of the branched lines, and the gap distance between the resonator and the branched line.
  • the back side of substrate 20 is coated with high temperature superconductor thin film 21 as the ground plane of the filter as shown in the back view in Figure 4 (b) , and the cross sectional view in Figure 4(c), of the circuit.
  • Figure 5 shows another embodiment of the high power high temperature superconductor filter of the present invention in the microstrip line form.
  • it is a 2-pole filter consisting of 2 circular shaped high temperature superconductor resonators with coupling circuits located on the back side of the substrate, which is the side opposite of the resonators.
  • Figure 5(a) shows the front view, in which two TM 010 mode high temperature superconductor circular shaped resonators 32a and 32b are deposited on the front surface of a substrate 30.
  • the back side of substrate 30 is coated with high temperature superconductor thin film 31 serving as the ground plane for the filter as shown in the cross sectional view given in Figure 5 (c) .
  • the coupling circuits are located on the back side of substrate 30 as shown in Figure 5(b) .
  • the coupling circuits are in the coplanar line form.
  • the input and output coupling circuits include: the center transmission lines 34 and 34a, the branched center transmission lines 35 and 35a, and the discontinuities 33 and 33a in the thin film of ground plane 31 around the perimeter of the transmission lines.
  • the branched center transmission lines 35 and 35a have three sections with different angles to match the circumferential edges of the resonators which have been projected onto the back of the substrate 30 as indicated by the dashed circles in Figure 5 (b) .
  • the reason for such a configuration is to spread the electromagnetic fields in a large area for increasing the power handling capability, and also for more uniformly exciting the azimuthal symmetrical TM 010 mode.
  • the discontinuities 33 and 33a are adjacent to or overlap the projection of the resonator shape to provide overlap of the electromagnetic fields of the resonators and the coupling circuits to maximize coupling strength.
  • the interconnecting coupling circuit for coupling between resonators is also in the coplanar line form, and includes the center transmission line 37 and the discontinuity 36 in the film of the ground plane around the perimeter of line 37 as shown in Figure 5 (b) .
  • the coupling strength can be adjusted by varying the location, shape, and the dimensions of the coupling circuit parts: 33, 33a, 34, 34a, 35, 35a, 36, and 37.
  • Figure 6 shows yet another embodiment of the high power high temperature superconductor filter of the present invention in the microstrip line form.
  • it is a 2-pole filter with 2 circular shaped high temperature superconductor resonators on the front side of the substrate and a hybrid coupling circuit.
  • hybrid coupling circuit is used herein to mean a coupling circuit which is partially located on the front side of the substrate and partially located on the back side of the substrate.
  • Figure 6(a) shows the front view, in which there are two high temperature superconductor circular shaped TM Q I Q resonators 42a and 42b, and a double arc shaped high temperature superconductor interconnecting coupling circuit 46, which couples between the two resonators, deposited on the front surface of the substrate 40.
  • the back side of 40 is coated with high temperature superconductor thin film 41 as shown in Figure 6(c), which serves as the ground plane of the filter.
  • the input and output coupling circuits are on the back side of the substrate 40 as shown in Figure 6(b), and include the following parts: the high temperature superconducting center transmission lines 44 and 44a, the branched high temperature super ⁇ conducting center transmission lines 45 and 45a, and the discontinuities 43 and 43a in the film of the ground plane around the perimeter of the transmission lines.
  • the branched center lines 45 and 45a have three sections with different angles to match the projection of the circumferential edges of the resonators, said projection indicated by the dashed circles in Figure 6(b) .
  • the reasons for such a configuration are to spread the electromagnetic fields in a large area for increasing the power handling capability, and also for more uniformly exciting the azimuthal symmetrical TM 010 mode.
  • the coupling strength can be adjusted by varying the location, shape, and the dimensions of the coupling circuit parts: 43, 43a, 44, 44a, 45, 45a, and 46.
  • the discontinuities 43 and 43a are adjacent to or overlap the projections of the resonator edges to maximize coupling.
  • the high power high temperature superconductor filters of the present invention are not limited to the TM 010 mode alone. Any TM 0i0 mode with i « an integer of at least one can be used. For a given resonator, the TM 0i0 mode with a greater mode index i has a higher resonant frequency than that of the mode with a smaller mode index i.
  • Figure 7 shows an example, which is the same filter as shown in Figure 4 except that there are radial slots in the circular shaped high temperature superconductor resonators for suppressing the unwanted interfering modes.
  • Figure 7(a), Figure 7(b), and Figure 7(c) show the front view, the back view, and the cross sectional view, respectively, of the high power high temperature superconductor filter of the present invention. All of the parts: 20, 21, 22a, 22b, 23a, . 23b, 24a, 24b, and 25 are the same as described for Figure 4, except that as shown in Figure 7 (a) there are radial direction slots 28a and 28b in the high temperature superconductor resonators 22a, and 22b, respectively.
  • All the TM 0i0 modes (i «* 1, 2 , 3, ...) high temperature superconductor filters of the present invention can use this means to suppress the adverse effects of interfering modes.
  • Radial slots are positioned parallel to the current of the desired operating mode and perpendicular to the current of any undesired or interfering mode.
  • Similar operating modes exist in the symmetrical polygon shaped resonators. As the number of edges increases, the shape of a symmetrical polygon approaches that of a circle. Therefore, it can be expected that the symmetrical polygon resonators having a number of edges or sides n greater than about 6 (n > 6) will have the TM 0i0 modes with attractive features similar to those of the circular shaped resonators.
  • FIG. 8 shows an embodiment of such a symmetrical polygon shaped high temperature superconductor filter. In this particular case, it is a 2-pole symmetrical octagon shaped high temperature superconductor filter having coupling on the back side of the substrate.
  • Figure 8(a), Figure 8(b), and Figure 8(c) show the front view, the back view, and the cross sectional view of the filter, respectively.
  • Figure 8 (b) shows the coplanar coupling circuits in this particular case located on the back side of the substrate coated with thin film 51 and include the following parts: the center transmission lines, 54 and 54a, branched center transmission lines, 55 and 55a, and discontinuities 53 and 53a in the film 51 of the ground plane around the perimeter of the transmission lines, for the input and output coupling circuits; and center transmission line 57, and discontinuity 56 in the film of the ground plane around line 57 for the interconnecting coupling circuits for coupling between resonators .
  • the shape of the branched center lines 55 and 55a match the shape of the projection of the edges of the symmetrical octagon resonators as shown by the dashed lines.
  • the discontinuities 53 and 53a are adjacent to or overlap the projection of the resonator shape to maximize coupling.
  • the coupling can be either front-side coupled, back-side coupled, or the combination of front-side and back-side couplings designated hybrid coupling.
  • the TM 0i0 m °de U - 1» 2, 3, • • • ) high power high temperature superconductor filters of the present invention can be in the microstrip line form (i.e. the signal-ground form) with only one ground plane, or can also be in the strip line form (i.e. the ground-signal- ground form) with two ground planes.
  • Figure 9 shows a filter of the present invention in strip line form. In this particular case, it is a TM 010 mode 2-pole high temperature superconductor filter similar to the one shown in Figure 4 except that this one is in the strip line form with two ground planes.
  • Figure 9(c) shows the cross sectional view, in which there are two substrates 60a and 60b, and two ground planes 61a and 61b.
  • the filter's resonators and circuits as shown in Figure 9(a) are sandwiched between these two substrates, 60a and 60b, with the high temperature superconductor ground planes 61a and 61b facing outwards.
  • Figure 9(b) shows either of the two high temperature superconductor ground planes 61a or 61b.
  • the filter consists of two circular shaped high temperature superconductor resonators 62a and 62b; and the coupling circuits including the following parts: the input and output high temperature superconductor transmission center lines 63a and 63b; branched center high temperature superconductor transmission lines 64a and 64b; and the interconnecting coupling line 65 for coupling between the resonators.
  • These high temperature superconductor circuits shown in Figure 9(a) can be either deposited on one of the substrates such as 60a or preferably can be two mirror image circuits deposited on both substrates 60a and 60b.
  • the high power TM oi0 mode (i «* 1, 2, 3, ⁇ • • ) high temperature superconductor filter of the present invention can be in a "stand alone" form, such as shown in Figure 4, Figure 5, Figure 6, Figure 7, and Figure 8, and can also be used as the components for high temperature superconductor filter banks and multiplexers.
  • Such a multiplexer of the present invention comprises an improved high temperature superconducting filter of the type having (a) at least two resonators, each comprising a patterned high temperature superconductor film deposited on one side of a substrate;
  • the TM 0i0 mode (i « 1, 2, 3, • • • ) high temperature superconductor filter of the present invention handles very high power levels due to the elimination of the wrap-around H-field which causes very sharp current peaks.
  • the TM 0i0 mode (i - 1, 2, 3, • • • ) high temperature superconductor filter of the present invention comprises any number of such resonators determined by the number of poles of the filter.
  • the coupling circuits for the filters preferably spread the electromagnetic fields over a large area and are evenly distributed along the edges of the resonators or the projection of the edges of the resonators when back side coupling is employed.
  • the coupling circuits can be located on the same substrate surface as the resonators, can be located on the back side of the substrate, opposite the side with the resonators, or can be a combination of both.
  • the filters, filter banks, and multiplexers of the present invention are useful in microwave communication satellites, and in electronic systems for selecting and channeling radiofrequency signals, in particular in telecommunication systems.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Superconductor Devices And Manufacturing Methods Thereof (AREA)

Abstract

Cette invention concerne des filtres, des bancs de filtres, ainsi que des multiplexeurs supraconducteurs, de grande puissance et à haute température. Ces éléments possèdent des résonateurs plats, supraconducteurs, à haute température, en forme de cercle ou de polygone symétrique, et à mode TM0i0 (i = 1, 2, 3, ...). Ce système permet d'éliminer le champ H enveloppant, ainsi que les crêtes de courant très brusques au niveau du bord d'un résonateur.
PCT/US1996/010952 1996-06-27 1996-06-27 FILTRES, BANCS DE FILTRES ET MULTIPLEXEURS SUPRACONDUCTEURS DE GRANDE PUISSANCE, A HAUTE TEMPERATURE ET A MODE TM¿0i0? WO1997050145A1 (fr)

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PCT/US1996/010952 WO1997050145A1 (fr) 1996-06-27 1996-06-27 FILTRES, BANCS DE FILTRES ET MULTIPLEXEURS SUPRACONDUCTEURS DE GRANDE PUISSANCE, A HAUTE TEMPERATURE ET A MODE TM¿0i0?

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PCT/US1996/010952 WO1997050145A1 (fr) 1996-06-27 1996-06-27 FILTRES, BANCS DE FILTRES ET MULTIPLEXEURS SUPRACONDUCTEURS DE GRANDE PUISSANCE, A HAUTE TEMPERATURE ET A MODE TM¿0i0?

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4238747A (en) * 1979-08-10 1980-12-09 The United States Of America As Represented By The Secretary Of The Air Force Mode filter apparatus
US5281934A (en) * 1992-04-09 1994-01-25 Trw Inc. Common input junction, multioctave printed microwave multiplexer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4238747A (en) * 1979-08-10 1980-12-09 The United States Of America As Represented By The Secretary Of The Air Force Mode filter apparatus
US5281934A (en) * 1992-04-09 1994-01-25 Trw Inc. Common input junction, multioctave printed microwave multiplexer

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
A.K. SHARMA ET AL.: "Spectral domain analysis of a hexagonal microstrip resonator", IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, vol. 30, no. 5, May 1982 (1982-05-01), NEW YORK US, pages 825 - 828, XP002025824 *
A.M. KHILLA: "Ring and disk resonator CAD model", MICROWAVE JOURNAL, vol. 27, no. 11, November 1984 (1984-11-01), DEDHAM US, pages 91 - 105, XP002025823 *
Y. NAGAI ET AL.: "Properties of disk resonators and end-coupled disk filters with superconducting films", JAPANESE JOURNAL OF APPLIED PHYSICS, vol. 32, no. 12a, December 1993 (1993-12-01), TOKYO JP, pages 5527 - 5531, XP002025822 *
Z.-Y. SHEN ET AL.: "High-power HTS planar filters with novel back-side coupling", IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, vol. 44, no. 6, 10 June 1996 (1996-06-10), NEW YORK US, pages 984 - 986, XP000588990 *

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