JPS61281605A - phased array antenna - Google Patents

Abstract

PURPOSE:To fix efficiently the antenna by arranging a board of a circularly polarized excitation hybrid ring circuit to the rear side of a conductor plate beneath each antenna element and fixing the hybrid ring board through a hole provided at the center. CONSTITUTION:The antenna element 1 if fixed to a mounting conductor 3 by a fixing bolt 6 and a nut 4 and a circularly polarized two-point exciting hybrid ring circuit board 2 is fixed. Since the entire rear side is used grounding in the hybrid ring circuit in general, the rear side of the board is fixed so as to be in contact with the mounting conductor thereby grounding the antenna element and the hybrid ring circuit at the same time. Since new bolt or nut for circuit board fixing tool is not required for the hybrid ring circuit board, the number of components is halved so as to realize economy and light weight.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a rotationally symmetrical microstrip antenna constituting a planar or spherical phased array antenna;
The present invention relates to a hybrid ring circuit directly below each antenna element, and particularly to a phased array antenna suitable for circularly polarized wave excitation with two-point feeding.

[Conventional technology]

Each antenna element of a conventional phased array antenna using a hybrid ring circuit was configured separately from the hybrid ring circuit.

(Problems to be Solved by the Invention) Since each antenna element and hybrid ring circuit are configured separately, it is necessary to consider the grounding method of the hybrid ring circuit board, and considering the space occupied by the hybrid ring circuit, the antenna system It had drawbacks such as being heavier and larger.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide efficient fixation of a hybrid ring circuit for circularly polarized wave excitation for each antenna element of a phased array antenna.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention arranges a board of an ivalid ring circuit for circularly polarized wave excitation on the back side of a conductor plate directly under each antenna element, and connects the antenna element through a hole provided in the center. Through the grounding post connected to the center,
The antenna was configured to fix the hybrid ring board using a ground post.

[Effect]

The hybrid ring circuit has no circuit elements at all in the center of the circuit, and it is possible to work to fix it in the center.
Since the conductor that fixes the antenna element is grounded, it can also be used for grounding the hybrid ring circuit, so there is no need to separately consider how to fix the hybrid ring circuit, and moreover, efficient fixation can be achieved. .

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

10 to 3 are shown to facilitate understanding of the embodiment; FIG. 1 is a perspective view showing the attachment of the antenna element to the mounting conductor; FIG. 2 is a sketch of the antenna element;
FIG. 3 is a front view thereof.

These symbols are the same as the numbers shown in the following examples, so their explanation will be omitted.

FIG. 5 and FIG. 6 are diagrams showing an embodiment of the present invention.

The antenna element 1 is fixed to the mounting conductor 3 using the fixing bottle 6 and the nut 4, and at the same time, the hybrid ring circuit board 2 for two-point circularly polarized wave excitation is fixed. The hybrid ring circuit is fixed at the center of the circuit as shown in FIG. 4, and the input end 22 is connected to a connector 26. Further, the terminal end 23 is grounded through a chip resistor 27, and the output ends 24 and 25 are connected to respective power supply transmission lines with bonding wires 29. Two straight lines 13.1 that are perpendicular to each other at the center of the antenna element are transmitted in two directions with a 90" phase difference by this hybrid ring circuit.
Circularly polarized waves can be generated by supplying power at two points equidistant from the center of the antenna. The distance from the center is related to the impedance of the antenna element and is determined so as to match the feed system.

Hybrid ring circuits are generally used with the back metal surface grounded, so by fixing the back surface 8 of the board (the surface without the circuit pattern) in contact with the mounting conductor, you can ground the antenna element and ground the hybrid ring circuit. Grounding is also possible at the same time. Furthermore, as shown in FIGS. 4 and 6, by making the hybrid ring circuit board circular, it is possible to ground the peripheral edge of the circuit board and fix the circuit board at the same time even with a spherical mounting conductor. FIG. 7 shows one type of phased array antenna in which an antenna element is fixed to a spherical mounting conductor.

According to the present invention, there is no need for new circuit board fixing jigs, fixing bolts, nuts, etc. for the hybrid ring circuit board, and the number of parts can be reduced by half, resulting in economicalization and The effect is that the weight can be reduced by that amount.

Furthermore, the hybrid is located closest to the antenna element.

The existence of a ring circuit makes it possible to minimize the length of the transmission line for two-point excitation of one circularly polarized wave.

Furthermore, since the antenna element and the hybrid ring circuit have an integrated structure, space can be used effectively, and the overall size of the phased array antenna can be expected to be reduced.

[Brief explanation of drawings]

FIG. 1 is a diagram of how the antenna element is attached to the mounting conductor. 2 and 3 are antenna elements; the former is a sketch, the latter is a front view, and FIG. 4 is an installation diagram of a hybrid ring circuit board for two-point circularly polarized wave excitation according to an embodiment of the present invention. 5 and 6 are also diagrams of how the antenna element is attached to the mounting conductor, and FIG. 7 is a phased array antenna similarly arranged on a spherical surface. 1... Antenna element, 11... Feeding point, 12...
Fixed hole. 13.14... Straight lines orthogonal at the center of the antenna element. 2... Hybrid ring circuit board, 21... Hybrid ring circuit pattern, 22... Input end, 23
...2 reflectionless termination, 24...output end (+90'),
25... Output end, 26... Input connector, 27.
...Chip resistor, 28...Earth area, 29...Bonding wire, 3...Mounting conductor, 31...Flat mounting conductor, 32...Spherical mounting conductor, 4...Fixing nut, 5... Power supply transmission line, 6... Fixing bolt, 7
... Support for antenna element, 8. Conductor on back side of hybrid ring circuit, 9. Dielectric material at center of hybrid ring circuit board, 10. Hole for power supply transmission line. Ryo 1 Figure 12 Figure 1FJ3 Figure 4 Figure % 5 Figure 6

Claims (1)

[Claims] 1. In a phased array antenna consisting of a plurality of rotationally symmetrical microstrip antennas arranged on a flat or spherical conductor plate, a hybrid ring circuit for circularly polarized wave excitation is installed on the back side of the conductor plate directly below each antenna element. A phased array antenna characterized in that a substrate is arranged, a ground post connected to the center of the antenna element is penetrated through a hole provided in the center of the hybrid ring, and the hybrid ring substrate is fixed by the ground post.