CN219611780U

CN219611780U - Antenna matching circuit structure for emergency help seeking

Info

Publication number: CN219611780U
Application number: CN202320250165.9U
Authority: CN
Inventors: 吕强; 刘金全; 王捷; 杨立业; 王新蕾; 许建辉; 田方; 宋博
Original assignee: Beijing Guodian Gaoke Technology Co ltd
Current assignee: Beijing Guodian Gaoke Technology Co ltd
Priority date: 2023-02-09
Filing date: 2023-02-09
Publication date: 2023-08-29
Anticipated expiration: 2033-02-09

Abstract

The utility model relates to the technical field of antennas, in particular to an antenna matching circuit structure for emergency help seeking. The utility model relates to an antenna matching circuit structure for emergency help, which comprises an antenna, a transmitting circuit, a receiving and transmitting circuit, a radio frequency switch and a receiving and transmitting control circuit, wherein the output end of the receiving and transmitting control circuit is electrically connected with the radio frequency switch; a band-pass filter is electrically connected between the radio frequency switch and the antenna; the antenna and the transmitting circuit are electrically connected with a first inductor; the radio frequency switch and the transceiver circuit are electrically connected with a second capacitor, so that 160M transmission and 400M receiving and transmitting share a pair of antennas, and the antenna not only has an AIS distress signal transmitting function, but also has a satellite communication function. The utility model has simple circuit, low cost and good effect.

Description

Antenna matching circuit structure for emergency help seeking

Technical Field

The utility model relates to the technical field of antennas, in particular to an antenna matching circuit structure for emergency help seeking.

Background

The AIS distress device has the transmitting power of 162MHz, does not have a satellite communication function, and can only transmit distress signals to surrounding ships and shore-based receivers. The emergency distress terminal based on the sky-start low-orbit satellite constellation has the transmitting and receiving frequency of 400MHz, does not have the AIS distress signal transmitting function, and can only transmit distress information to satellites. Both of which cannot be obtained.

Therefore, in order to enable two transmitters to use the same antenna, the utility model provides an antenna matching circuit structure for emergency help seeking, so that the antenna can reach the output gain of qualified wireless signals under different frequencies.

Disclosure of Invention

The utility model aims to at least solve one of the technical problems in the prior art and provides an antenna matching circuit structure for emergency help seeking.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: the antenna matching circuit structure for emergency help comprises an antenna, a transmitting circuit, a receiving and transmitting circuit, a radio frequency switch and a receiving and transmitting control circuit, wherein the output end of the receiving and transmitting control circuit is electrically connected with the radio frequency switch; a band-pass filter is electrically connected between the radio frequency switch and the antenna; the antenna and the transmitting circuit are electrically connected with a first inductor; and the radio frequency switch and the receiving and transmitting circuit are electrically connected with a second capacitor.

Further, the antenna is a tape antenna.

Further, the tape antenna may be 195mm in length.

Further, the transmitting circuit includes a 162MHz transmitter; the transceiver circuit includes a 400MHz transceiver.

Further, a first inductor is connected in parallel with the band pass filter.

Further, the first inductance is 150nH.

Further, the band-pass filter is formed by connecting a second inductor and a first capacitor in series.

Further, the second inductance is 68nH; the first capacitance is 2pF.

The utility model has the beneficial effects that: as can be seen from the above description of the present utility model, compared with the prior art, the antenna matching circuit structure for emergency help-seeking of the present utility model includes an antenna, a transmitting circuit, a receiving and transmitting circuit, a radio frequency switch, and a receiving and transmitting control circuit, wherein an output end of the receiving and transmitting control circuit is electrically connected with the radio frequency switch; a band-pass filter is electrically connected between the radio frequency switch and the antenna; the antenna and the transmitting circuit are electrically connected with a first inductor; the radio frequency switch and the transceiver circuit are electrically connected with a second capacitor, so that 160M transmission and 400M receiving and transmitting share a pair of antennas, and the antenna not only has an AIS distress signal transmitting function, but also has a satellite communication function. The utility model has simple circuit, low cost and good effect.

Drawings

Fig. 1 is a schematic structural diagram of an antenna matching circuit structure for emergency help in a preferred embodiment of the present utility model.

Reference numerals: 1. an antenna; 2. a transmitting circuit; 3. a transceiver circuit; 4. a radio frequency switch; 5. and a transmission/reception control circuit.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1, the preferred embodiment of the utility model is an antenna matching circuit structure for emergency help, which comprises an antenna 1, a transmitting circuit 2, a receiving and transmitting circuit 3, a radio frequency switch 4 and a receiving and transmitting control circuit 5, wherein the output end of the receiving and transmitting control circuit 5 is electrically connected with the radio frequency switch 4; a band-pass filter is electrically connected between the radio frequency switch 4 and the antenna 1; the antenna 1 and the transmitting circuit 2 are electrically connected with a first inductor L1; the radio frequency switch 4 and the transceiver circuit 3 are electrically connected with a second capacitor C2, wherein the transmitting circuit 2 comprises a 162MHz transmitter; the transceiver circuit 3 comprises a 400MHz transceiver, so that 160M transmitting and 400M receiving and transmitting share a pair of antennas, and the antenna not only has an AIS distress signal transmitting function, but also has a satellite communication function. The utility model has simple circuit, low cost and good effect

As a preferred embodiment of the utility model, it may also have the following additional technical features: antenna 1 is a tape antenna, which is 195mm long. Namely, the radio frequency circuit needs to meet the requirement that the transmission of 162MHz and the receiving and transmitting of 400MHz share a pair of tape antenna with the length of 195mm, thereby realizing half-duplex operation. Because of being limited by the size of the product, the adopted antenna is a tape antenna, the impedance at the frequency point of 400MHz is about 50Ω, and the impedance of the antenna at the frequency point of 162MHz is about 3-150jΩ.

In this embodiment, a first inductor L1 is connected in parallel with the band-pass filter, where the first inductor L1 is 150nH; the band-pass filter is formed by connecting a second inductor L2 and a first capacitor C1 in series, wherein the second inductor L2 is 68nH; the first capacitor C1 is 2pF.

Specifically, the L1 (150 nH) of the utility model is 160MHz transmission matching inductance; l2 and C1 are connected in series to form a 400MHz receiving-transmitting matching circuit.

When the 160MHz transmitting circuit is turned on, the radio frequency switch is switched to RF1 (suspended);

when the 400MHz transceiver circuit is turned on, the radio frequency switch is switched to RF2, and the antenna is connected with the 400MHz transceiver through the radio frequency switch after passing through C1 and L2.

If the radio frequency switch is directly shunted, when the radio frequency switch is used for 162MHz transmission, the impedance of the radio frequency switch to the ground is connected to the antenna in parallel, although the impedance of the radio frequency switch to the ground is larger, the impedance of the antenna is larger, the radiation impedance of the antenna is very small, the impedance of the radio frequency switch to the ground is unstable, so that the impedance of the radio frequency switch to the ground after being connected in parallel is greatly uncertain, great transmitting loss is caused, and subsequent matching is difficult.

Therefore, when designing, can not let 162MHz signal pass through the switch, 162MHz this way directly passes 150nH inductance, its equivalent inductance is about 153j when 162MHz, get into 162MHz matching circuit after eliminating the reactance of antenna, and the radio frequency switch cuts on unsettled pin when 162MHz is launched, test finds that even the switch hangs the inside of time switch to the earth impedance still can play the influence to 162MHz antenna, so add a band-pass filter of high Q value by L2 and C1 series connection between switch and antenna, L2=68 nH, C1=2pF, series resonance frequency is about 431MHzHz, this band-pass filter fine separation 162MHz signal, still guarantee 400MHz signal's smooth passage when receiving.

When the 400MHz transceiver circuit works, the inductance of L1 at 400MHz frequency is 377 omega, and the impedance of 162MHz transmitting circuit has negligible effect on 400MHz signal after L1 is connected in series.

In summary, the circuit of the utility model adopts the simplest mode of inductance and LC resonance circuit, so that 162MHz transmission and 400MHz receiving and transmitting share one pair of antennas.

The above additional technical features can be freely combined and superimposed by a person skilled in the art without conflict.

It will be understood that the utility model has been described in terms of several embodiments, and that various changes and equivalents may be made to these features and embodiments by those skilled in the art without departing from the spirit and scope of the utility model. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the utility model without departing from the essential scope thereof. Therefore, it is intended that the utility model not be limited to the particular embodiment disclosed, but that the utility model will include all embodiments falling within the scope of the appended claims.

Claims

1. An antenna matching circuit structure for emergency help seeking, which is characterized in that: the antenna comprises an antenna, a transmitting circuit, a receiving and transmitting circuit, a radio frequency switch and a receiving and transmitting control circuit, wherein the output end of the receiving and transmitting control circuit is electrically connected with the radio frequency switch; a band-pass filter is electrically connected between the radio frequency switch and the antenna; the antenna and the transmitting circuit are electrically connected with a first inductor; and the radio frequency switch and the receiving and transmitting circuit are electrically connected with a second capacitor.

2. The antenna matching circuit configuration for emergency help according to claim 1, wherein: the antenna is a tape antenna.

3. The antenna matching circuit configuration for emergency help according to claim 2, wherein: the length of the tape antenna is 195mm.

4. The antenna matching circuit configuration for emergency help according to claim 1, wherein: the transmitting circuit includes a 162MHz transmitter; the transceiver circuit includes a 400MHz transceiver.

5. The antenna matching circuit configuration for emergency help according to claim 1, wherein: the first inductor is connected in parallel with the band-pass filter.

6. The antenna matching circuit configuration for emergency call-for-help of claim 5, wherein: the first inductance is 150nH.

7. The antenna matching circuit configuration for emergency call-for-help of claim 5, wherein: the band-pass filter is formed by connecting a second inductor and a first capacitor in series.

8. The antenna matching circuit configuration for emergency call-for-help of claim 7, wherein: the second inductance is 68nH; the first capacitance is 2pF.