CN202551031U - NFC (near field communication) terminal capable of increasing NFC communication distance - Google Patents

Abstract

The utility model discloses an NFC (near field communication) terminal capable of increasing the NFC communication distance. The NFC terminal comprises an NFC chip, a duplexer, an NFC antenna, a simulated single-pole double-throw switch, a power amplifier and a baseband chip. A signal transmitting end of the NFC chip is connected with a moving contact of the simulated single-pole double-throw switch, a first fixed contact of the simulated single-pole double-throw switch is connected with a first signal end of the duplexer, and a second fixed contact of the simulated single-pole double-throw switch is connected with the first signal end of the duplexer through the power amplifier. A signal receiving end of the NFC chip is connected with a second signal end of the duplexer, a third signal end of the duplexer is connected with the NFC antenna, and a control end of the simulated single-pole double-throw switch and an enabling control end of the power amplifier are both connected with the baseband chip. The baseband chip is used for controlling on and off states of the simulated single-pole double-throw switch to correspondingly control on and off of the power amplifier, so that users can freely select proper NFC communication distance according to operating environments.

Description

A kind of NFC terminal that increases NFC communication distance

technical field

The utility model relates to the technical field of NFC communication, in particular to an NFC terminal which increases the distance of NFC communication.

Background technique

As shown in FIG. 1 , it is a structural block diagram of an existing NFC terminal, which includes an NFC chip 101 , a duplexer 102 , an NFC antenna 103 and a baseband chip 104 . The signal transmitting end 1 of the NFC chip 101 is connected to the first signal end 1' of the duplexer 102, the signal receiving end 2 of the NFC chip 101 is connected to the second signal end 2' of the duplexer 102, and the third signal of the duplexer 102 Terminal 3' is connected to the NFC antenna 103. The signal transmitted by the NFC chip is coupled and fed to the NFC antenna 103 by the duplexer 102, and is transmitted through the NFC antenna 103. The signal received by the NFC antenna 103 is transmitted to the signal receiving end of the NFC chip 101 through the duplexer 102, and the baseband chip performs this The signal is processed.

At present, NFC (near-field communication) functions are more and more used in mobile phones. NFC applications are mainly divided into: card simulation (that is, NFC terminal as a read device) and point-to-point (that is, point-to-point communication between two NFC terminals). In both applications, the communication distance of NFC is only about 5cm. This communication distance cannot meet some special application requirements. For example, when two mobile phones use the NFC function to exchange business cards, or when two mobile phones use the NFC function for Bluetooth pairing, the two mobile phones need to be placed very close together, otherwise the above cannot be achieved. function, which brings inconvenience to users. Therefore, how to increase the communication distance of the NFC terminal has become an urgent distance problem in this field.

Utility model content

In view of the shortcomings of the above-mentioned prior art, the purpose of this utility model is to provide an NFC terminal with increased NFC communication distance, so as to solve the problem of short communication distance of the existing NFC terminal.

In order to achieve the above object, the utility model has taken the following technical solutions:

An NFC terminal that increases the NFC communication distance, which includes an NFC chip, a duplexer, an NFC antenna, an analog single-pole double-throw switch, a power amplifier for amplifying the signal transmitted by the NFC chip, and a device for controlling the analog single-pole double-throw switch conduction state, and correspondingly control the baseband chip that the power amplifier is turned on and off according to the conduction state of the analog single-pole double-throw switch;

The signal transmitting end of the NFC chip is connected to the movable contact of the analog single-pole double-throw switch, and the first fixed contact of the analog single-pole double-throw switch is connected to the first signal end of the duplexer; The fixed contact is connected to the first signal end of the duplexer through the power amplifier;

The signal receiving end of the NFC chip is connected to the second signal end of the duplexer, and the third signal end of the duplexer is connected to the NFC antenna;

The control terminal of the analog single-pole double-throw switch is connected to the first GPIO port of the baseband chip, and the enable control terminal of the power amplifier is connected to the second GPIO port of the baseband chip; the NFC chip is connected to the baseband chip.

The aforementioned NFC terminal for increasing the NFC communication distance further includes a radio frequency transceiver module and a radio frequency antenna, and the radio frequency antenna, radio frequency transceiver module, and baseband chip are sequentially connected.

In the aforementioned NFC terminal for increasing the NFC communication distance, the power amplifier is a power amplifier with a gain of 5dbm.

In the aforementioned NFC terminal for increasing the NFC communication distance, the NFC terminal is a mobile phone.

Compared with the prior art, the NFC terminal that increases the NFC communication distance provided by the utility model includes an NFC chip, a duplexer, an NFC antenna, an analog single-pole double-throw switch, a power amplifier for signal amplification, and a baseband chip, which is controlled by the baseband chip Simulate the conduction state of the SPDT switch, and control the power amplifier on and off according to the conduction state of the simulated SPDT switch; that is, when the baseband chip controls the movable contact of the simulated SPDT switch to connect to the first fixed contact , and at the same time control the power amplifier to turn off, at this time, the NFC communication distance of the NFC terminal will not be increased; when the baseband chip controls the movable contact of the analog SPDT switch to connect to the second fixed contact, at the same time control the power amplifier to turn on, at this time the power amplifier will be The signal emitted by the NFC chip is amplified to increase the NFC communication distance of the NFC terminal, so that users can freely choose a suitable NFC communication distance according to the usage environment.

Description of drawings

FIG. 1 is a structural block diagram of an existing NFC terminal.

Fig. 2 is a structural block diagram of an NFC terminal that increases the NFC communication distance of the present invention.

Detailed ways

The utility model provides an NFC terminal that increases the NFC communication distance. In order to make the purpose, technical solution and effect of the utility model clearer and clearer, the utility model will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Please refer to FIG. 2 , which is a structural block diagram of an NFC terminal for increasing the NFC communication distance of the present invention. As shown in the figure, the NFC terminal provided by the present invention includes an NFC chip 110 , a duplexer 120 , an NFC antenna 130 , an analog SPDT switch 140 , a power amplifier 150 and a baseband chip 160 .

Wherein, the NFC chip 110 includes a signal transmitting terminal 1 and a signal receiving terminal 2 for transmitting and receiving signals respectively. The power amplifier 150 is used to amplify the signal transmitted by the NFC chip 110 and send it to the duplexer 120 .

The duplexer 120 is used to isolate the transmitted and received signals to ensure that the reception and transmission can work normally at the same time. It includes three signal terminals, namely: the first signal terminal 1', the second signal terminal 2' and the second signal terminal. Three signal terminals 3', the first signal terminal 1' is used to receive the signal transmitted by the NFC chip 110, the second signal terminal 2' is used to send the signal of the NFC antenna 130 to the signal receiving terminal 2 of the NFC chip 110, and the third signal Terminal 3 ′ is used for sending and receiving signals, that is, sending signals from the NFC chip 110 to the NFC antenna 130 and receiving signals from the NFC antenna 130 .

The baseband chip 160 is used to control the conduction state of the analog SPDT switch 140 , and control the power amplifier 150 to turn on and off according to the conduction state of the analog SPDT switch 140 .

In the embodiment of the present invention, the signal transmitting end 1 of the NFC chip 110 is connected to the movable contact a of the simulated single-pole double-throw switch 140, and the first fixed contact b of the simulated single-pole double-throw switch 140 is connected to the first fixed contact b of the duplexer 120. A signal terminal 1 ′, the second fixed contact c of the simulated SPDT switch 140 is connected to the first signal terminal 1 ′ of the duplexer 120 through the power amplifier 150 . In this embodiment, the signal transmission link from the signal transmission terminal 1 of the NFC chip 110 to the first signal terminal 1' of the duplexer 120 is the signal transmission link of the NFC chip 110, and the transmission link is changed to Two paths, one path passes through the power amplifier 150 to amplify the signal to extend the NFC communication distance, and the other path passes through the power amplifier 150, and its communication distance is the normal communication distance.

The signal receiving end 2 of the NFC chip 110 is connected to the second signal end 2' of the duplexer 120, and the third signal end 3' of the duplexer 120 is connected to the NFC antenna 130; the NFC chip 110 is connected to the baseband chip 160, and the baseband The chip 160 controls the NFC chip 110 to transmit signals or processes signals received by the NFC chip 110 . In this embodiment, the receiving link from the signal receiving end 2 of the NFC chip 110 to the second signal end 2' of the duplexer 120 is the receiving link of the NFC chip 110 to receive the signal from the NFC antenna 130 .

The control terminal e of the analog SPDT switch 140 is connected to the first GPIO port GIPO1 of the baseband chip 160, and the baseband chip 160 sends a control signal to control the conduction state of the analog SPDT switch 140, and the enabling control of the power amplifier 150 Terminal EN is connected to the second GPIO port GIPO2 of the baseband chip 160. When the baseband chip 160 controls the conduction state of the analog SPDT switch 140, it controls the power amplifier 150 to be turned on and off accordingly. The control principle will be described in detail later. .

In the embodiment of the utility model, the NFC terminal also includes a radio frequency transceiver module 170 and a radio frequency antenna 180, the radio frequency antenna 180, the radio frequency transceiver module 170, and the baseband chip 160 are connected in sequence, and the baseband chip 160 processes the signal of the radio frequency transceiver module 170.

In a specific implementation, the NFC terminal is a mobile phone, the power amplifier 150 is a power amplifier 150 with a gain of 5dbm, the center frequency of the power amplifier 150 is 13.56MHz, and its working frequency is 13.553MHz~13.567MHz. These parameters are the working frequency and working bandwidth of NFC in the NFC standard.

The working principle of the present utility model is described in detail below taking the NFC terminal as the mobile phone as an application example:

When the user is in use, the conduction state of the simulated SPDT switch 140 can be set through the mobile phone menu. For example, there are two options "increase NFC communication distance" and "do not increase NFC communication distance" in the mobile phone menu. When the user selects " When increasing the NFC communication distance", the baseband chip 160 controls the movable contact a of the analog SPDT switch 140 to be connected to the second fixed contact c, and simultaneously controls the power amplifier 150 to open, so that the power amplifier 150 starts to work, because the power amplifier 150 has 5dbm gain increases the NFC communication distance. Similarly, when the user selects "do not increase the NFC communication distance", the baseband chip 160 controls the movable contact a of the analog SPDT switch 140 to be connected to the first fixed contact b, and simultaneously controls the power amplifier 150 to close, so that the power amplifier 150 Stop working, at this time, because the power amplifier 150 is not connected, the communication distance of NFC returns to normal.

In summary, the NFC terminal that increases the NFC communication distance provided by the utility model controls the conduction state of the simulated SPDT switch through the baseband chip, and controls the power amplifier to be turned on and off according to the conduction state of the simulated SPDT switch ; That is, when the baseband chip controls the movable contact of the analog SPDT switch to connect to the first fixed contact, the power amplifier is controlled to be closed at the same time, and the NFC communication distance of the NFC terminal is not increased at this time; when the baseband chip controls the analog SPDT switch When the movable contact is connected to the second fixed contact, the power amplifier is controlled to turn on at the same time. At this time, the power amplifier amplifies the signal emitted by the NFC chip and increases the NFC communication distance of the NFC terminal, so that the user can freely choose the appropriate NFC communication according to the use environment. distance.

It can be understood that those skilled in the art can make equivalent replacements or changes according to the technical solution of the utility model and its utility model concept, and all these changes or replacements should belong to the appended claims of the utility model protected range.

Claims (4)

1. A kind of NFC terminal that increases NFC communication distance, is characterized in that, comprises NFC chip, duplexer, NFC antenna, analog single-pole double-throw switch, is used for the power amplifier of the signal amplifying that NFC chip transmits and is used for controlling analog The conduction state of the single-pole double-throw switch, and the baseband chip that controls the power amplifier to be turned on and off according to the conduction state of the simulated single-pole double-throw switch; The signal transmitting end of the NFC chip is connected to the movable contact of the analog single-pole double-throw switch, and the first fixed contact of the analog single-pole double-throw switch is connected to the first signal end of the duplexer; The fixed contact is connected to the first signal end of the duplexer through the power amplifier; The signal receiving end of the NFC chip is connected to the second signal end of the duplexer, and the third signal end of the duplexer is connected to the NFC antenna; The control terminal of the analog single-pole double-throw switch is connected to the first GPIO port of the baseband chip, and the enable control terminal of the power amplifier is connected to the second GPIO port of the baseband chip; the NFC chip is connected to the baseband chip. 2. The NFC terminal increasing the NFC communication distance according to claim 1, further comprising a radio frequency transceiver module and a radio frequency antenna, and the radio frequency antenna, radio frequency transceiver module, and baseband chip are connected in sequence. 3. The NFC terminal for increasing the NFC communication distance according to claim 1, wherein the power amplifier is a power amplifier with a gain of 5dbm. 4. The NFC terminal for increasing the NFC communication distance according to claims 1 to 3, wherein the NFC terminal is a mobile phone.

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