Airborne UHF frequency band power amplifier
Through ultra-wideband impedance matching and liquid-cooled heat dissipation design, combined with multi-stage wave-limiting filtering technology, the space miniaturization and high efficiency of the onboard UHF band power amplifier is solved, and the high linearity and attack resistance are improved, meeting the strict requirements of the onboard system.
Patent Information
- Application Number
- CN202422254574.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-14
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-09-14
AI Technical Summary
Traditional airborne UHF band power amplifiers cannot meet the requirements of space miniaturization, high power, high efficiency and high linearity at the same time, and cannot adapt to the strict requirements of airborne systems.
The ultra-wideband impedance matching technology is used to combine transmission line transformers and centralized devices, and the integrated design of structure and liquid-cooled heat dissipation. The signal amplification unit adopts a multi-stage wave limiting, filtering and peak-removing overall design, and uses high thermal conductivity ceramic substrate capacitors and ferrite magnetic rings to optimize the RF path design.
It realizes the miniaturization of equipment, improves efficiency and linearity, enhances the attack resistance rate in low-pressure environments, and meets the strict requirements of the airborne system.
Smart Images
Figure CN223080006U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a UHF band power amplifier in the airborne field, belonging to the technical field of amplifiers, and can meet the application requirements of UHF band broadband high-power systems. Background Art
[0002] As the core equipment in the system, the airborne UHF band power amplifier has very strict requirements for space, weight, power consumption, linearity, shock and vibration. It is required to meet the requirements of high power, high efficiency, high linearity and light weight in a limited space at the same time, and the traditional design concept cannot meet the use requirements of the airborne system. Summary of the Utility Model
[0003] The utility model provides an airborne UHF band power amplifier. The power amplifier adopts an ultra-wideband impedance matching technology, combines a transmission line transformer and lumped devices to achieve an ultra-wideband 8-fold impedance transformation ratio. At the same time, the power amplifier adopts an integrated design technology of structure and liquid cooling heat dissipation, and solves the problems of miniaturization, high power, high efficiency and light weight of the airborne power amplifier.
[0004] The utility model is realized through the following technical solutions:
[0005] An airborne UHF band power amplifier, comprising:
[0006] A signal amplification unit 1 for amplifying an input signal;
[0007] A power amplifier control unit 2 for providing a logic control signal to the signal amplification unit; it communicates with the upper computer, receives the upper computer command and reports the working state and fault information of the power amplifier;
[0008] A power amplifier secondary power supply 3 for converting an input voltage into a corresponding output voltage;
[0009] Both the power amplifier control unit 2 and the signal amplification unit 1 are connected to the power amplifier secondary power supply 3 and are powered by the power amplifier secondary power supply 3; the power amplifier control unit 2 and the signal amplification unit 1 are connected to transmit control information to the signal amplification unit.
[0010] Further, the signal amplification unit 1 includes: an amplitude modulation and phase modulation module 4, a drive amplification module 5, a four-way divider 6, a final stage module 7, a four-way combiner 8, a filter 9 and a coupler 10 connected in sequence;
[0011] The amplitude modulation and phase modulation module 4 is connected to an external signal input, the output is connected to the drive amplification module 5, and then enters the four-way divider 6 to divide the signal into four equal parts. The divided signals are amplified in power by four final stage modules 7, and then enter the four-way combiner 8 for signal synthesis. The output is connected to the input of the filter 9, and the output of the filter 9 is connected to the input of the coupler 10.
[0012] Furthermore, the housing and cover plate of the filter are laser-sealed and welded; it is internally provided with a high thermal conductivity ceramic substrate capacitor for filter heat dissipation; the edges of the flat capacitors of the filter are covered with co-fired ceramics, and the RF ground is coated with silicone.
[0013] Furthermore, the transmission line of the four-way combines is loaded with ferrite magnetic rings.
[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0015] 1. In the final stage module of the signal amplification unit of the present utility model, the precise modeling of the power tube large-signal model is used, and a transmission line transformer is used for broadband impedance matching. While keeping the output power unchanged, the volume of the device can be significantly reduced;
[0016] 2. In the filter of the signal amplification unit of the present utility model, a laser-sealed filter is adopted to ensure the airtightness of the device. There is a new type of high thermal conductivity ceramic substrate capacitor inside, which can improve the heat dissipation ability of the filter. Measures such as covering the edges of the flat capacitors with high-field co-fired ceramics and coating the RF ground with silicone are used to increase the dielectric breakdown field strength. Under low-pressure environments, the power resistance ≥ 1500W.
[0017] 3. In the four-way combines of the signal amplification unit of the present utility model, the transmission line is loaded with ferrite magnetic rings, which can greatly increase the magnetic coupling strength, shorten the wavelength of the transmitted signal, and finally achieve high broadband and miniaturization of the four-way combines.
[0018] 4. The signal amplification unit of the present utility model adopts a multi-stage wave limiting, filtering and peak elimination overall design technology. An amplitude limiter is added at the input end of the RF path to reduce the peak power of the input signal; the output power of the drive stage is optimized and limited to avoid generating over-excited output signals; an equalization network is added within the RF passband to improve the gain flatness of the power amplifier; a band-pass filter is added between stages to filter out out-of-band non-linear products generated by the previous stage, which can avoid low-frequency self-oscillation of the power amplifier and prevent voltage breakdown of the final stage power tube. Description of the Drawings
[0019] Figure 1 is the electrical principle block diagram of the present utility model.
[0020] Figure 2 is the electrical principle block diagram of the signal amplification unit of the present utility model. Detailed Embodiments
[0021] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the following further details the present utility model in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.
[0022] An airborne UHF-band power amplifier, characterized in that it includes: a signal amplification unit 1, a power amplifier control unit 2, and a power amplifier secondary power supply 3. The signal amplification unit amplifies the input RF small signal to the large signal required by the power amplifier. The power amplifier control unit 2 uses optical fiber communication, can receive commands from the upper computer, report the working status and fault information of the power amplifier, and implement the protection function of the power amplifier. The power amplifier power supply 3 converts the input DC33V voltage into DC28V, DC15V, and DC5V required for operation.
[0023] The signal amplification unit described in the present utility model is characterized in that it includes an amplitude modulation and phase modulation module 4, a drive amplification module 5, a four-way splitter 6, a final stage module 7, a four-way combiner 8, a filter 9, and a coupler 10. The amplitude modulation and phase modulation module 4 is connected to the external signal input, and the output is connected to the drive amplification module 5. Then, after entering the four-way splitter 6, the signal is divided into four equal parts. The divided signals enter four final stage modules 7 for power amplification, and then enter the four-way combiner 8 for signal synthesis. After synthesis, the signal passes through the filter 9 to increase out-of-band harmonic suppression, and then the power is output after passing through the coupler 10.
[0024] Its application in the field of electronic jamming has the following indicators: operating frequency band: 225 MHz to 500 MHz, continuous wave output power ≥ 800 W, operating efficiency ≥ 40%, harmonic suppression ≥ 20 dB, input / output voltage standing wave ratio ≤ 2:1, spurious suppression ≥ 60 dB.
[0025] Refer to Figures 1 to 2 , the signal amplification unit 1, the power amplifier control unit 2, and the power amplifier power supply 3 of the present utility model. Figure 1 is the electrical principle block diagram of the present utility model, and the embodiment is connected according to Figure 1 the connection line. The signal amplification unit amplifies the input RF small signal to the large signal required by the power amplifier. The power amplifier control unit 2 sends logical control signals to the signal amplification unit, implements the protection function of the power amplifier, has the ability to communicate with the upper computer, can receive commands from the upper computer, and report the working status and fault information of the power amplifier. The power amplifier power supply 3 converts the input DC33V voltage into DC28V, DC15V, and DC5V required for operation.
[0026] The signal amplification unit of the present utility model includes an amplitude modulation and phase modulation module 4, a drive amplification module 5, a four-way splitter 6, a final stage module 7, a four-way combiner 8, a filter 9, and a coupler 10. Figure 2 is the electrical principle block diagram of the signal amplification unit of the present utility model, and the embodiment is connected according to Figure 2Connection circuit. The small signal input from the outside first passes through the amplitude modulation and phase modulation module 4 to adjust the amplitude and phase consistency in the middle of the power amplifier. Then the signal enters the drive amplification module 5 for the first amplification. The amplified signal is divided into four equal parts through the four-way splitter 6, and then enters the 4-channel final stage module 7 for further amplification. The four amplified signals are power-combined through the four-way combiner 8. The combined signal is filtered by the high-power filter 9 and then output after passing through the coupler 10. The coupled signal is divided into two paths. One path is given to the power amplifier control unit for power control, and the other path is directly output to the mission system for calibration.
[0027] The brief working principle of the present utility model:
[0028] The input radio frequency signal is power-amplified through the signal amplification unit. The power amplifier control unit provides power amplifier control, protection, and communication functions. The power amplifier power supply converts the input DC 33V into the DC voltage required by the power amplifier.
[0029] The installation structure of the present utility model is as follows:
[0030] The power amplifier is internally equipped with a cold plate, and the rest of the components are all designed modularly. The main heat-generating components are screwed on both sides of the cold plate, and the modules are connected by cables. Through the layered design, the heat generated during the operation of the power amplifier can be timely exported, which can not only improve the reliability of the equipment but also greatly reduce the volume of the equipment.
[0031] It should be noted that the above is only a preferred application example of the present utility model and is not used to limit the protection scope of the present utility model. All technical solutions using equivalent substitution or equivalent transformation forms are within the protection scope of the present utility model.
Claims
1. An airborne UHF band power amplifier, characterized in that, Comprising: A signal amplification unit (1) for amplifying an input signal; A power amplifier control unit (2) that provides a logic control signal to the signal amplification unit; It communicates with a host computer, receives host computer commands, and reports the working status and fault information of the power amplifier; A secondary power supply (3) of the power amplifier that converts an input voltage into a corresponding output voltage; Both the power amplifier control unit (2) and the signal amplification unit (1) are connected to the secondary power supply (3) of the power amplifier and are powered by the secondary power supply (3) of the power amplifier; the power amplifier control unit (2) and the signal amplification unit (1) are connected to transmit control information to the signal amplification unit.
2. The airborne UHF band power amplifier according to claim 1, characterized in that, The signal amplification unit (1) includes: an amplitude modulation and phase modulation module (4), a drive amplification module (5), a four-way splitter (6), a final stage module (7), a four-way combiner (8), a filter (9), and a coupler (10) connected in sequence; The amplitude modulation and phase modulation module (4) is connected to an external signal input, and its output is connected to the drive amplification module (5). Then, it enters the four-way splitter (6) to divide the signal into four equal parts. The divided signals are amplified in power by four final stage modules (7), and then enter the four-way combiner (8) for signal synthesis. The output is connected to the input of the filter (9), and the output of the filter (9) is connected to the input of the coupler (10).
3. The airborne UHF band power amplifier according to claim 2, characterized in that, The box body and the cover plate of the filter are laser-sealed and welded; a ceramic substrate capacitor with a high thermal conductivity coefficient for heat dissipation of the filter is provided inside; the edges of the planar capacitors of the filter are covered by co-fired ceramics, and the RF ground is coated with silicone.
4. The airborne UHF band power amplifier according to claim 2, characterized in that Ferrite magnetic rings are loaded on the transmission lines of the four-way combiner.