A high-sensitivity L-band radio frequency receiver

Abstract

This utility model relates to the field of wireless communication technology, and in particular to a high-sensitivity L-band radio frequency receiver. It includes a receiver housing encapsulating internal modules, and cover plates respectively disposed at the top and bottom of the receiver housing. An annular electromagnetic sealing strip is provided at the bottom outer side of the cover plate. The cover plate seals the receiver housing via an installation mechanism. A partition is provided inside the receiver housing, dividing the interior into different cavities to reduce mutual interference between internal circuits. The cover plate isolates the internal circuitry from the external electromagnetic environment. Simultaneously, the annular electromagnetic sealing strip fills the gap between the cover plate and the receiver housing, ensuring conductive connection and preventing electromagnetic leakage. This utility model, through multi-dimensional shielding, fully isolates the internal circuitry from the external electromagnetic environment, effectively suppressing local oscillator leakage and digital noise, thereby enhancing receiver sensitivity.

Description

Technical Field

[0001] This utility model relates to the field of wireless communication technology, and in particular to a high-sensitivity L-band radio frequency receiver. Background Technology

[0002] L-band typically refers to radio waves with a frequency range of 1 GHz to 2 GHz. It achieves a good balance between atmospheric attenuation, penetration capability (superior to the higher frequency Ku / Ka band), and antenna size. L-band RF receivers downconvert RF signals from 1675 MHz to 1683 MHz to an intermediate frequency of 60 MHz ± 4 MHz, amplify the intermediate frequency signal, and output it. They generally have gain adjustment function, external control power-off function, and reverse connection protection function for the power supply.

[0003] Since sensitivity is ultimately determined by the total noise figure of the system and the minimum signal-to-noise ratio required, the end caps of current L-band RF receivers are designed to be relatively simple. During assembly, there may be tiny seams between the end cap and the housing, which can easily lead to electromagnetic leakage, resulting in a higher system noise figure and directly affecting the receiving sensitivity of the RF receiver.

[0004] Therefore, in view of the fact that the splicing seams of existing L-band RF receiver housings can easily lead to an increase in the system noise figure and affect the receiving sensitivity, a high-sensitivity L-band RF receiver can be designed. Through multi-dimensional shielding, the internal circuits are fully isolated from the external electromagnetic environment, effectively suppressing local oscillator leakage and digital noise, thereby enhancing the receiver sensitivity. Utility Model Content

[0005] To overcome the problem that most L-band RF receivers have relatively simple end cap designs, and that during assembly, there may be tiny seams between the end cap and the receiver body, which can easily lead to electromagnetic leakage, resulting in a high system noise figure and directly affecting the receiving sensitivity of the RF receiver, this utility model is proposed.

[0006] The technical solution of this utility model is as follows: a high-sensitivity L-band radio frequency receiver, including a receiver housing that encapsulates the internal modules of the receiver, and a cover plate body respectively disposed at the top and bottom of the receiver housing. An annular electromagnetic sealing strip is provided at the bottom outer side of the cover plate body. The cover plate body is used to close the receiver housing by means of an installation mechanism. A partition is provided on the inner side of the receiver housing to divide the inside of the receiver housing into different cavities, thereby reducing mutual interference between internal circuits.

[0007] Preferably, the cover plate body is installed on the receiver housing by setting an installation mechanism, so that the cover plate body seals the receiver housing and isolates the internal circuit of the receiver housing from the external electromagnetic environment. The internal part of the receiver housing is divided into different cavities by a partition, which reduces mutual interference between internal circuits. The gap between the cover plate body and the receiver housing is filled by an annular electromagnetic sealing strip to ensure conductive connection and avoid electromagnetic leakage. This achieves full isolation between the internal circuit and the external electromagnetic environment, effectively suppresses local oscillator leakage and digital noise, and enhances the receiver sensitivity.

[0008] Preferably, the material of the cover body is including but not limited to galvanized steel sheet or aluminum alloy. The cover body isolates the internal circuit from the external electromagnetic environment, and the annular electromagnetic sealing strip reduces the gap between the cover body and the receiver box.

[0009] Preferably, the mounting mechanism includes a mounting groove and an annular fitting groove. Two sets of mounting grooves are symmetrically provided on the top and bottom of the inner side of the receiver housing, and an annular fitting groove is provided on the inner side of the mounting groove.

[0010] Preferably, the cover plate body is embedded in the mounting groove, so that the contact surface between the receiver box and the cover plate body is sufficiently flat. The annular electromagnetic sealing strip is fitted and connected to the annular fitting groove. The annular electromagnetic sealing strip is made of an elastic material with metal mesh or conductive cloth, which can completely fill the annular fitting groove and ensure conductive connection.

[0011] Preferably, the cover plate body has multiple openings on its surface, and fasteners are installed and fixed to the cover plate body through some of the openings. A magnetic ring body is embedded inside the openings to suppress high-frequency common-mode noise.

[0012] Preferably, the inner walls of the two sets of cover plates are coated with microwave absorbing coatings. The microwave absorbing coatings absorb the resonant energy reflected from the receiver housing cavity, reduce the Q value, prevent noise from forming standing waves at certain frequency points and thus enhance it, and suppress local oscillator leakage and digital noise.

[0013] The beneficial effects of this utility model are:

[0014] When using the receiver, assemble each module into the receiver housing. Divide the receiver housing into different cavities using partitions to reduce internal circuit interference. Then, install the cover plate onto the receiver housing, sealing both ends and isolating the internal circuitry from the external electromagnetic environment. Simultaneously, fill the gap between the cover plate and the receiver housing with an annular electromagnetic sealing strip to ensure conductive connection and prevent electromagnetic leakage. This addresses the issue that most L-band RF receiver housing end covers are relatively simple, and during assembly, minute seams may exist between the end cover and the housing, easily leading to electromagnetic leakage, resulting in a high system noise figure and directly affecting the receiver's sensitivity. This enhances the receiver's sensitivity. Attached Figure Description

[0015] Figure 1 The diagram shown is a three-dimensional structural schematic of a high-sensitivity L-band radio frequency receiver according to this utility model.

[0016] Figure 2 The diagram shown is a three-dimensional schematic of a split-type high-sensitivity L-band radio frequency receiver according to this utility model.

[0017] Figure 3 The diagram shown is a three-dimensional structural diagram of the receiver housing of a high-sensitivity L-band radio frequency receiver according to this utility model.

[0018] Figure 4 The diagram shows a three-dimensional structure of the cover plate body and the microwave absorbing coating of a high-sensitivity L-band radio frequency receiver according to this utility model.

[0019] Figure 5 The diagram shows a three-dimensional structure of the magnetic ring body and the cover plate body of a high-sensitivity L-band radio frequency receiver according to this utility model.

[0020] Explanation of reference numerals in the attached drawings: 1. Receiver housing; 2. Cover plate body; 201. Mounting groove; 202. Opening; 203. Magnetic ring body; 204. Microwave absorbing coating; 3. Annular electromagnetic sealing strip; 301. Annular fitting groove; 4. Partition. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Please see Figure 1 and Figure 2This utility model provides an embodiment: a high-sensitivity L-band radio frequency receiver, including a receiver housing 1 that encapsulates the internal modules of the receiver, and a cover plate body 2 respectively disposed at the top and bottom of the receiver housing 1. The material of the cover plate body 2 includes, but is not limited to, galvanized steel plate or aluminum alloy. The cover plate body 2 isolates the internal circuit from the external electromagnetic environment. An annular electromagnetic sealing strip 3 is provided at the bottom outer side of the cover plate body 2 to reduce the gap between the cover plate body 2 and the receiver housing 1. The cover plate body 2 seals the receiver housing 1 through an installation mechanism. A partition 4 is provided on the inner side of the receiver housing 1 to divide the inside of the receiver housing 1 into different cavities, reduce mutual interference between internal circuits, and reduce the effective noise figure of the entire system.

[0023] Please see Figure 3 In this embodiment, the mounting mechanism includes a mounting groove 201 and an annular fitting groove 301. Two sets of mounting grooves 201 are symmetrically formed at the top and bottom of the inner side of the receiver housing 1. An annular fitting groove 301 is formed on the inner side of each mounting groove 201. The cover plate body 2 is embedded within the mounting groove 201, ensuring a sufficiently flat contact surface between the receiver housing 1 and the cover plate body 2. An annular electromagnetic sealing strip 3 is fitted and connected to the annular fitting groove 301. The annular electromagnetic sealing strip 3 is made of an elastic material with a metal mesh or conductive cloth. The material composition allows the annular fitting groove 301 to be completely filled, ensuring conductive connection. When assembling the cover plate body 2, the installation position of the cover plate body 2 is determined by the installation groove 201, and the cover plate body 2 is completely embedded into the installation groove 201 to ensure that the contact surface between the receiver box 1 and the cover plate body 2 is sufficiently flat, reducing gaps. At the same time, the annular electromagnetic sealing strip 3 is embedded in the annular fitting groove 301, and the material properties of the annular electromagnetic sealing strip 3 are used to completely fill the annular fitting groove 301, ensuring conductive connection while reducing gaps.

[0024] Please see Figure 4 and Figure 5 In this embodiment, the surface of the cover plate body 2 has multiple sets of openings 202. Fasteners are installed and fixed to the cover plate body 2 through some of the openings 202. A magnetic ring body 203 is embedded inside the opening 202. The magnetic ring body 203 suppresses high-frequency common-mode noise. The inner walls of the two sets of cover plate bodies 2 are respectively coated with microwave absorbing coatings 204. The microwave absorbing coatings 204 absorb the resonant energy reflected from the receiver housing 1 cavity, reduce the Q value, prevent noise from forming standing waves at certain frequency points and thus enhance it, and suppress local oscillator leakage and digital noise.

[0025] When assembling the receiver, each module is assembled into the receiver housing 1. The interior of the receiver housing 1 is divided into different cavities by the partition 4 to reduce mutual interference between internal circuits.

[0026] Subsequently, the cover plate body 2 is fully embedded into the mounting groove 201. At the same time, the annular electromagnetic sealing strip 3 is simultaneously embedded into the annular fitting groove 301 to ensure that the contact surface between the receiver housing 1 and the cover plate body 2 is sufficiently flat, reducing gaps. The material properties of the annular electromagnetic sealing strip 3 are used to completely fill the annular fitting groove 301, ensuring conductive connection while reducing gaps. Part of the circuit is passed through the corresponding opening 202, and then the fasteners are screwed into the corresponding openings 202 in sequence to complete the assembly of the cover plate body 2. At the same time, the magnetic ring body 203 suppresses high-frequency common-mode noise at the opening 202. In addition, the microwave absorbing coating 204 on the inner wall of the cover plate body 2 absorbs the resonant energy reflected in the cavity of the receiver housing 1, reducing the Q value, preventing noise from forming standing waves at certain frequency points and increasing, and suppressing local oscillator leakage and digital noise.

[0027] Through the above steps, the cover body 2 is installed on the receiver housing 1 by setting up the installation mechanism, so that the cover body 2 seals the receiver housing 1 and isolates the internal circuit of the receiver housing 1 from the external electromagnetic environment. The partition 4 divides the inside of the receiver housing 1 into different cavities, reducing mutual interference between internal circuits. The annular electromagnetic sealing strip 3 fills the gap between the cover body 2 and the receiver housing 1 to ensure conductive connection and avoid electromagnetic leakage. Thus, the internal circuit is fully isolated from the external electromagnetic environment, effectively suppressing local oscillator leakage and digital noise.

[0028] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A high-sensitivity L-band radio frequency receiver comprising a receiver box (1) in which the internal modules of the receiver are housed, characterized in that: It also includes a cover plate body (2) respectively set at the top and bottom of the receiver box (1). The outer bottom of the cover plate body (2) is provided with an annular electromagnetic sealing strip (3). The cover plate body (2) is used to close the receiver box (1) through the installation mechanism. A partition (4) is provided on the inner side of the receiver box (1). The partition (4) divides the inside of the receiver box (1) into different cavities to reduce mutual interference of internal circuits.

2. A high sensitivity L-band radio frequency receiver as claimed in claim 1, characterized in that: The material of the cover body (2) includes, but is not limited to, galvanized steel plate or aluminum alloy. The internal circuit is isolated from the external electromagnetic environment by the cover body (2), and the gap between the cover body (2) and the receiver box (1) is reduced by the use of the annular electromagnetic sealing strip (3).

3. A high sensitivity L-band radio frequency receiver as claimed in claim 1, characterized in that: The mounting mechanism includes a mounting groove (201) and an annular fitting groove (301). Two sets of mounting grooves (201) are symmetrically opened at the top and bottom of the inner side of the receiver box (1). An annular fitting groove (301) is opened on the inner side of the mounting groove (201).

4. A high sensitivity L-band radio frequency receiver as claimed in claim 3, characterized in that: The cover plate body (2) is embedded in the mounting groove (201), so that the contact surface between the receiver box (1) and the cover plate body (2) is flat enough. The annular electromagnetic sealing strip (3) is fitted and connected to the annular fitting groove (301). The annular electromagnetic sealing strip (3) is made of an elastic material with metal mesh or conductive cloth, which can completely fill the annular fitting groove (301) to ensure conductive connection.

5. A high sensitivity L-band radio frequency receiver as claimed in claim 1, characterized in that: The cover plate body (2) has multiple openings (202) on its surface. Fasteners are installed and fixed to the cover plate body (2) through some of the openings (202). A magnetic ring body (203) is embedded inside the opening (202) to suppress high-frequency common-mode noise.

6. A high sensitivity L-band radio frequency receiver as claimed in claim 1, characterized in that: The inner walls of the two sets of cover plates (2) are coated with microwave absorbing coatings (204). The microwave absorbing coatings (204) absorb the resonant energy reflected from the receiver box (1) cavity, reduce the Q value, prevent noise from forming standing waves at certain frequency points and increasing, and suppress local oscillator leakage and digital noise.

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