CN219611733U

CN219611733U - Ka frequency band amplitude limiting low-noise discharging circuit

Info

Publication number: CN219611733U
Application number: CN202321913665.2U
Authority: CN
Inventors: 李智; 谢承华; 罗继成
Original assignee: Innomicro Chengdu Electronics Co Ltd
Current assignee: Chengdu Yuanwang Leixin Electronic Technology Co ltd
Priority date: 2023-07-20
Filing date: 2023-07-20
Publication date: 2023-08-29
Anticipated expiration: 2033-07-20

Abstract

The utility model discloses a Ka frequency band amplitude limiting low-noise discharging circuit which comprises a radio frequency circuit, a power circuit, a signal input end, a signal output end and a power interface. The amplitude limiting low-noise radiation frequency circuit comprises an input waveguide bridge, an amplitude limiter, a low-noise amplifier and an output waveguide bridge, wherein the input waveguide bridge and the output waveguide bridge are all 90-degree 3dB waveguide bridges, and a signal input end, the amplitude limiting low-noise radiation frequency circuit and a signal output end are sequentially connected. The power supply circuit is respectively connected with the power supply interface and the amplitude limiting low-noise radio frequency circuit. The utility model has the characteristics of strong burning resistance, good standing wave and the like, and solves the problem of insufficient burning resistance of the traditional amplitude limiter.

Description

Ka frequency band amplitude limiting low-noise discharging circuit

Technical Field

The utility model relates to the technical field of satellite communication, in particular to a Ka frequency band amplitude limiting low-noise amplifier circuit.

Background

Millimeter waves are widely used in radar and guidance systems, electronic countermeasures, millimeter wave communications, and the like. In recent years, the development of millimeter wave frequency bands is one of the main contents of electronic technology development in the world's mainly developed countries. Compared with microwaves, millimeter waves have short wavelength and high frequency, so that the microwave can provide a very wide bandwidth, has high data transmission capacity, and can provide larger system capacity and special propagation characteristics.

Since the loss of millimeter wave in space transmission is very large (30 Km loss is up to 153.6dB in 38 GHz), the millimeter wave power amplifier is taken as one of the most critical components in the whole millimeter wave system, in order to increase the transmission distance, the output power of the millimeter wave power amplifier is required to be very high, and under the condition that the output power of the millimeter wave power amplifier is continuously improved, the safety requirement of a receiving channel is also higher and higher.

Disclosure of Invention

In order to solve the problems, the utility model provides a Ka frequency band amplitude limiting low-noise amplifying circuit, which reduces the input power of an amplitude limiter by carrying out power division processing on an input large signal, thereby ensuring the safe work of a later-stage low-noise amplifier and improving the port standing wave matching of the amplitude limiting low-noise amplifier.

The utility model discloses a Ka frequency band amplitude limiting low-noise amplifier circuit, which comprises the following specific technical scheme:

the circuit comprises a radio frequency circuit, a power supply circuit, a signal input end, a signal output end and a power supply interface;

the radio frequency circuit comprises a waveguide bridge, a limiter and a low-noise amplifier, wherein the waveguide bridge comprises an input waveguide bridge and an output waveguide bridge;

the signal input end, the radio frequency circuit and the signal output end are sequentially connected in sequence, and the power supply circuit is respectively connected with the power supply interface and the radio frequency circuit;

the two output ends of the input waveguide bridge are respectively connected with the limiter, the limiter is correspondingly and respectively connected with the low-noise amplifier, and the low-noise amplifier is respectively connected with the two input ends of the output waveguide bridge.

Furthermore, one input end of the input waveguide bridge is connected with the signal input end, and the other input end is used as an isolation end to be connected with the absorber;

and one output end of the output waveguide bridge is connected with the signal output end, and the other output end is connected with the absorber as an isolation end.

Further, the absorber is a high-loss magnetic material made of resin and a magnetic material, and is used as a wave absorbing load after being machined.

Further, the wave-absorbing load is of a wedge-shaped structure.

Further, the input waveguide bridge is connected to the limiter through a conversion structure, and the conversion structure is a waveguide-microstrip conversion structure.

Further, the output waveguide bridge is connected with the low-noise amplifier through a conversion structure, and the conversion structure is a microstrip-waveguide conversion structure.

Further, the input waveguide bridge and the output waveguide bridge are each a 90 ° 3dB waveguide bridge.

The beneficial effects of the utility model are as follows:

the input waveguide bridge is used for carrying out power division processing on the input large signal, and the output waveguide bridge is used for carrying out two-way limiting amplification and combining output, so that the input power of the limiter is reduced, the safe work of the low-noise amplifier at the later stage is ensured, the burning-out resistance is high, the port standing wave matching of the limiting low-noise amplifier is improved, and the standing wave is good.

Drawings

Fig. 1 is a schematic diagram of the overall circuit configuration.

Fig. 2 is a schematic diagram of the overall connection of the waveguide bridge, the wave-absorbing load and the switching structure.

Reference numerals illustrate: 1-waveguide bridge, 2-wave-absorbing load and 3-conversion structure.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the embodiments of the present utility model, it should be noted that, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship conventionally put in use of the product of the present utility model as understood by those skilled in the art, merely for convenience of describing the present utility model and simplifying the description, and is not indicative or implying that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for understanding as indicating or implying a relative importance.

In the description of the embodiments of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may 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.

Example 1

The embodiment 1 of the utility model discloses a Ka frequency band amplitude limiting low-noise amplifier circuit, which is shown in fig. 1, and specifically comprises the following steps:

the device comprises a radio frequency circuit, a power circuit, a signal input end, a signal output end and a power interface;

the radio frequency circuit comprises a waveguide bridge 1, a limiter and a low-noise amplifier, wherein the waveguide bridge comprises an input waveguide bridge and an output waveguide bridge;

in this embodiment, an input end of the input waveguide bridge is connected to the signal input end, and the other input end is connected to the absorber as an isolation end;

In this embodiment, the input waveguide bridge and the output waveguide bridge are both 90 ° 3dB waveguide bridges.

As shown in fig. 2, in this embodiment, the absorber is a high-loss magnetic material made of resin and magnetic material, and is used as the wave-absorbing load 2 after machining;

in this embodiment, the wave-absorbing load 2 has a wedge structure.

In this embodiment, two output ends of the input waveguide bridge are respectively connected with the limiter;

performing power processing on the signal input by the signal input end through the input waveguide bridge so as to reduce the amplitude of the signal entering the limiter and perform good impedance matching on the input port; and the output waveguide bridge is used for realizing the combination of two paths of limiting amplification and simultaneously carrying out quantized impedance matching on the output port.

The limiter can realize limiting output of the inputted large signal, thereby protecting the subsequent devices.

The limiter is correspondingly and respectively connected with the low-noise amplifier, and the low-noise amplifier is respectively connected with two input ends of the output waveguide bridge;

and amplifying the input radio frequency signal with low noise through the low noise amplifier.

In this embodiment, the input waveguide bridge is connected to the limiter through a switching structure 3; the conversion structure 3 is a waveguide-microstrip conversion structure;

and the transition from the waveguide to the microstrip is realized through the waveguide-microstrip conversion structure.

The output waveguide bridge is connected with the low-noise amplifier through a conversion structure 3; the conversion structure 3 is a microstrip-waveguide conversion structure;

and the transition from the microstrip to the waveguide is realized through the microstrip-waveguide conversion structure.

Based on the circuit structure of the embodiment, low insertion loss is realized at the bandwidth of 33 GHz-37 GHz: 0.1dB (typical value), low standing wave: 1.08.

the foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present utility model.

Claims

1. The Ka frequency band amplitude limiting low-noise amplifier circuit is characterized by comprising a radio frequency circuit, a power circuit, a signal input end, a signal output end and a power interface;

2. The Ka band limiting low noise amplifier circuit of claim 1, wherein one input terminal of said input waveguide bridge is connected to said signal input terminal and the other input terminal is connected as an isolation terminal to an absorber;

3. The Ka-band limited low noise amplifier circuit according to claim 2, wherein the absorber is a high-loss magnetic material made of resin and a magnetic material, and is used as a wave-absorbing load.

4. The Ka-band limited low noise amplifier circuit according to claim 3, wherein said wave-absorbing load is a wedge structure.

5. The Ka band clipping low-noise amplifier circuit of claim 1 wherein the input waveguide bridge is connected to the clipping device by a transition structure, the transition structure being a waveguide-microstrip transition structure.

6. The Ka band limiting low noise amplifier circuit of claim 1, wherein said output waveguide bridge is connected to said low noise amplifier by a transition structure, said transition structure being a microstrip-waveguide transition structure.

7. The Ka band limiting low noise amplifier circuit according to any one of claims 1-6, wherein said input waveguide bridge and said output waveguide bridge are each 90 ° 3dB bridges.