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High-frequency interference preventive RF antenna impedance match circuit and design method thereof

A technology for preventing high-frequency interference and matching circuits. It is applied to antennas, impedance networks, electrical components, etc., and can solve problems such as affecting communication quality, reserving more, and signal interference, ensuring matching performance and suppressing high-frequency noise. Scatter and improve performance

Active Publication Date: 2015-11-18
FUJIAN LANDI COMML EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned antennas solve the problem of signal interference between different communication modes to a certain extent, it causes more space to be reserved in the structural design; at the same time, since the current handheld devices are getting smaller and smaller, even two antennas If they are far away, there may be mutual interference, which will affect the quality of communication

Method used

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  • High-frequency interference preventive RF antenna impedance match circuit and design method thereof
  • High-frequency interference preventive RF antenna impedance match circuit and design method thereof
  • High-frequency interference preventive RF antenna impedance match circuit and design method thereof

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Embodiment 1

[0025] Please refer to image 3 , Embodiment 1 of the present invention is: a RF antenna impedance matching circuit for preventing high-frequency interference, including a first port A and a second port B, which are respectively connected to the RFID module and the RF antenna; the ports A and B respectively include two A symmetrical connection line, the first port A includes a connection line A+ and a connection line A-, and the second port B includes a connection line B+ and a connection line B-. Take the connection line A+ to the connection line B+ as an example: the connection between the connection line A+ and the connection line B+ is connected through a series inductor L; one end of the inductor L is connected to the connection line A+ and the parallel capacitor Cp is connected to the ground line GND; the other end of the inductor L is connected to Connect wire B+ and parallel capacitor C 1 To the ground wire GND; In addition, the capacitor C connected in series through...

Embodiment 2

[0030] In this embodiment, the parameter design method of the impedance matching circuit in the first embodiment will be further described by taking the RF frequency of 13.53 MHz and suppressing the high frequency of 900 MHz as an example.

[0031] According to the above working principle, the capacitance C of the present invention 2 The parameters are determined according to the frequency of the high-frequency spurs that need to be suppressed, and the capacitor C 1 The parameters are based on the impedance of the RFID antenna to be matched, that is to say, the capacitance C and the capacitance C in the original circuit 2 parameters are determined. The following details the capacitance C 1 、C 2 The parameter calculation method.

[0032] First need to determine the capacitance C 2 parameters. In practical application L 2 often C 2 parasitic parameters, so L 2 The parameter is very small, according to the existing technology level, optional L 2 The inductance value is ...

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Abstract

The invention discloses a high-frequency interference preventive RF antenna impedance match circuit and a design method thereof. The circuit comprises a first port A and a second port B, the first port A and the second port B are connected with an RFID module and an RF antenna respectively, the first port A comprises a connecting line A+ and a connecting line A-, the second port B comprises a connecting line B+ and a connecting line B-, an inductor L is connected between the connecting line A+ and the connecting line B+, a capacitor C1 is connected between the connecting line B+ and a ground wire GND, a capacitor C2 and an inductor L2 are connected in series between the connecting line B+ and the ground wire GND, and a circuit between the connecting line A- and the connecting line B- is symmetrical with that between the connecting line A+ and the connecting line B+ by taking the ground line GND as the center. A coupling capacitor of a traditional impedance match circuit is replaced by the capacitor C1 and the capacitor C2 in parallel connection, the capacitance of the capacitors can be selected reasonably, the matching performance of the circuit itself is ensured, high-frequency stray of specific frequency beyond the work frequency range can be inhibited, and the performance of wireless communication is improved.

Description

technical field [0001] The invention relates to the field of antennas, in particular to an RF antenna impedance matching circuit for preventing high-frequency interference and a design method thereof. Background technique [0002] With the development of communication technology, there are more and more communication methods with different working frequencies such as GPRS / CDMA / 3G. At the same time, with the change of people's consumption concept, credit card consumption has accounted for a considerable proportion, and the application of hand-held payment POS is becoming more and more widespread, and the small space of hand-held payment POS machines usually contains both GPRS system and RFID system. Antennas of respective frequency bands need to be installed, and signals of different frequency bands are coupled through antennas to cause interference during operation. [0003] At present, the RF antenna matching circuit for the 13.56MHz frequency band often only performs impe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q23/00
CPCH01Q23/00H03H11/00
Inventor 涂锂程蒋锦扬吴钦钦
Owner FUJIAN LANDI COMML EQUIP CO LTD