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High-power resonant switch

A high-power, switching technology, applied in the radio frequency field, can solve the problems of large RX insertion loss and achieve the effect of reconfigurable frequency

Pending Publication Date: 2021-10-26
南京元络芯科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is unacceptable, even when weighing the acceptable TX return loss (better) vs. RX insertion loss (better), the RX insertion loss results are greater than 0.8dB
[0008] To sum up, the high-power resonant switch in the prior art, the increased quarter-wavelength impedance transmission line will make the RX insertion loss large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A high-power resonant switch of the present invention is based on the original high-power resonant switch, and a matching network is added at TX for optimization. For the specific structure, see Figure 5As shown, the high-power resonant switch includes: a transmitting branch and a receiving branch respectively connected to the ANT port;

[0049] The transmission branch includes a matching network N2, a switch SW1, and a transmission port TX; the transmission port TX is connected to the ANT port after the switch SW1 is connected in series; the electrical node between the transmission port TX and the switch SW1 is connected to the matching network N2 and then grounded;

[0050] The receiving branch includes a matching network N1, a switch SW2 and a receiving port RX; the receiving port RX is connected in series with the matching network N1 and then connected to the ANT port; the electrical node between the receiving port RX and the matching network N1 is connected to the ...

Embodiment 2

[0058] In order to solve the frequency hopping problem, the present invention is based on the form of the matching network N2 being a capacitor, and adds another ground-to-ground capacitor Ctx2 at the ANT-TX path series switch SW3 to form a reconfigurable high-power resonant switch. Its structure is as follows Image 6 shown.

[0059] According to the above analysis, the parallel connection of TX to the ground capacitor Ctx2 brings about a new parallel resonance. According to the parallel resonance formula , the larger the capacitance value C of the capacitor Ctx2 is, the lower the resonant frequency is, so the reconfigurability of the working frequency band can be realized by adjusting the capacitance value of the capacitor Ctx2 at TX. The specific analysis is as follows:

[0060] (a) When ANT-RX is in state: all switches are disconnected (OFF), at this time SW3 is equivalent to a capacitor (small capacitance value), and the capacitance of the newly introduced SW3 connecte...

Embodiment 4

[0067] In Embodiment 4, the matching network N2 includes an inductor Ltx1, an inductor Ltx2, and a switch SW3;

[0068] One end of the inductor Ltx1 is connected between the transmitting port TX and the switch SW1, and the other end of the inductor Ltx1 is grounded;

[0069] One end of the switch SW3 is connected between the transmitting port TX and the switch SW1, and the other end of the switch SW3 is connected in series with the inductor Ltx2 and grounded;

[0070] In the transmitting mode: in the high frequency band working mode, the switch SW1 and SW3 are closed, the switch SW2 is off, and the transmitting branch is turned on; in the low frequency band working mode, the switches SW1, SW2 and SW3 are closed, and the transmitting branch is turned on. Pass;

[0071] In the receiving mode, the switch SW1, the switch SW2, and the switch SW3 are all turned off, and the receiving branch is turned on.

[0072] SW3 can also be placed between SW1 and TX port (embodiment 5 such as...

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Abstract

The invention discloses a high-power resonant switch. The high-power resonant switch comprises a transmitting branch and a receiving branch, wherein the transmitting branch comprises a matching network N2, a switch SW1 and a transmitting port TX, the transmitting port TX is connected in series with a switch SW1 and then is connected with an ANT port, and a matching network N2 is arranged between and connected with the transmitting port TX and the switch SW1. and the receiving branch comprises a matching network N1, a switch SW2 and a receiving port RX, the receiving port RX is connected in series with the matching network N1 and then is connected with the ANT port, and the switch SW2 is arranged between and connected with the receiving port RX and the matching network N1 and then is grounded. According to the invention, when the matching network N2 and ANT-TX are connected in parallel at the TX, the isolation of the TX-RX is increased, so center frequency can be adjusted, the problems that an inductor is matched by using a single capacitor and the bandwidth is too narrow are solved, and reconfigurable frequency is realized. During ANT-RX, the insertion loss of the ANT-RX is reduced.

Description

technical field [0001] The invention belongs to the field of radio frequency technology, and in particular relates to a high-power resonant switch. Background technique [0002] The RF switch is used to switch between receiving and transmitting radio frequency signals and switching between different frequency bands. The RF switch chip usually uses a series-parallel structure to balance its insertion loss and isolation requirements. Its circuit structure is as follows: figure 1 Shown: When ANT-TX is turned on, the ANT-TX series switch is turned on (ON, that is, closed), and the parallel switch is closed (OFF, that is, disconnected); the ANT-RX series switch is closed, and the parallel switch is turned on. At this time, both the TX parallel switch and the RX series switch are subjected to voltage. According to whether the power of ANT-TX and ANT-RX is the same, the switch structure can be designed as a symmetrical or asymmetrical structure. The symmetrical structure means t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/0175H04B1/44
CPCH03K19/017545H04B1/44
Inventor 孙志远王静波
Owner 南京元络芯科技有限公司
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