Power amplifier combiner

Abstract

The invention relates to a power amplifier combiner, which belongs to the field of wireless communication and comprises an antenna combining rack, two VHF (very high frequency) power amplifier units, two VHF / UHF (very high frequency / ultra high frequency) power amplifier units and a VHF / UHF combining unit. Wherein the two VHF power amplifier units and the two VHF / UHF power amplifier units are provided with four VHF channels in total, and the four VHF channels are combined and cascaded in a VHF frequency band; the two VHF / UHF power amplifier units are provided with two UHF channels, and the two UHF channels respectively output UHF frequency band signals after power amplification; and the VHF / UHF combining unit combines the UHF frequency band signals after power amplification, and outputs the combined UHF frequency band signals to a UHF antenna interface. According to the power amplifier combiner disclosed by the invention, the size of the combiner is greatly reduced, and the loss of the combiner is reduced; the working frequency band is widened, and more communication devices are supported; the signal amplification and filtering capabilities are increased, the communication capability when multiple devices work at the same time is effectively improved, and a better communication effect is brought.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication, and particularly to a power amplifier combiner. Background Art

[0002] Currently on the market, when solving the problems of multi-device and multi-band communication, a design similar to a passive multi-in-one combiner is usually adopted. The existing combiner can support up to 4 radio frequency signals to work simultaneously, realizing the combination of 4 channels. The existing combiner generally supports the combination of 3 VHF (Very High Frequency) band radio frequency signals and 1 UHF (Ultra High Frequency) band radio frequency signal, or the combination of 2 VHF band radio frequency signals and 1 UHF band radio frequency signal, and cannot meet the combination of more radio frequency signals in multiple bands.

[0003] In addition, the existing combiner usually only has a combining function, and the combiner and the power amplifier are deployed independently, occupying a large space in the communication front end of each communication hub or communication vehicle. Summary of the Invention

[0004] Embodiments of the present invention provide a power amplifier combiner to solve the problems in the prior art, such as large volume, large loss, few working frequency bands, and few supported communication devices of the combiner. The present invention redesigned the combiner, greatly reducing the volume of the combiner and lowering the loss of the combiner; broadening the working frequency band, supporting more communication devices; increasing the signal amplification and filtering capabilities, effectively improving the communication capabilities when multiple devices work simultaneously, and bringing better communication effects.

[0005] Embodiments of the present invention provide a power amplifier combiner, including: An antenna combining rack, two VHF power amplifier units, two VHF / UHF power amplifier units, and one VHF / UHF combining unit; Wherein, the two VHF power amplifier units and the two VHF / UHF power amplifier units are provided with a total of four VHF channels, and the four VHF channels are combined and cascaded in the VHF band; the two VHF / UHF power amplifier units are provided with two UHF channels, and the two UHF channels respectively output UHF band signals after power amplification; and the VHF / UHF combining unit combines the UHF band signals after power amplification and outputs them to the UHF antenna interface.

[0006] Further, the first VHF power amplifier unit in the two VHF power amplifier units amplifies the power of the first VHF band signal and outputs the amplified first VHF band signal to the second VHF power amplifier unit; the second VHF power amplifier unit in the two VHF power amplifier units amplifies the power of the second VHF band signal and outputs the amplified second VHF band signal and the amplified first VHF band signal together to the first VHF / UHF power amplifier unit in the two VHF / UHF power amplifier units; the first VHF / UHF power amplifier unit in the two VHF / UHF power amplifier units amplifies the power of the third VHF band signal and outputs the amplified first VHF band signal, the amplified second VHF band signal, and the amplified third VHF band signal to the second VHF / UHF power amplifier unit in the two VHF / UHF power amplifier units; the second VHF / UHF power amplifier unit in the two VHF / UHF power amplifier units amplifies the power of the fourth VHF band signal and combines and outputs the amplified first VHF band signal, the amplified second VHF band signal, the amplified third VHF band signal, and the amplified fourth VHF band signal to the VHF / UHF combining unit; the first VHF / UHF power amplifier unit amplifies the power of the first UHF band signal and outputs the amplified first UHF band signal to the VHF / UHF combining unit; the second VHF / UHF power amplifier unit amplifies the power of the second UHF band signal and outputs the amplified second UHF band signal to the VHF / UHF combining unit.

[0007] Further, a VHF10W filtering module, a VHF power amplifier module, and a VHF combining module are provided in the VHF power amplifier unit; a VHF / UHF10W filtering module, a VHF / UHF power amplifier module, and a VHF combining module are provided in the VHF / UHF power amplifier unit; wherein, a VHF100W filtering module is further provided in the VHF combining module, and a UHF100W filtering module is further provided in the VHF / UHF combining unit.

[0008] Further, the power amplifier combiner includes the following four filtering modules: VHF10W filtering module; VHF100W filtering module; UHF10W filtering module; UHF100W filtering module; Among them, the VHF 10W filtering module, the VHF 100W filtering module, the UHF 10W filtering module, and the UHF 100W filtering module are frequency hopping filtering modules; and among them, the VHF 100W filtering module is located in the VHF combining module, and the VHF combining module is located in the two VHF power amplifier units and the two VHF / UHF power amplifier units; the UHF 100W filtering module is located in the VHF / UHF combining unit, and among them, the VHF 10W filtering module, the VHF 100W filtering module, the UHF 10W filtering module, and the UHF 100W filtering module are assembled in a three-layer stack, and the three layers include a resonant inductor cavity, a resonant capacitor matrix, and a drive circuit.

[0009] Further, the resonant inductor in the resonant inductor cavity layer of the UHF 100W filtering module is a silver-plated copper column, and the diameter range is greater than or equal to 7.1 mm and less than or equal to 8.1 mm; the resonant inductor in the resonant inductor cavity of the VHF 100W filtering module is a silver-plated copper wire, and the diameter is greater than or equal to 2.5 mm and less than or equal to 3.5 mm; the resonant inductor in the resonant inductor cavity of the VHF 10W filtering module is a silver-plated copper wire, and the diameter is greater than or equal to 1.2 mm and less than or equal to 1.7 mm.

[0010] Further, the UHF 100W filtering module is an integrated silver-plated copper structure. Among them, the resonant inductor in the resonant inductor cavity is tightly welded to the outer shell of the integrated silver-plated copper structure; the resonant inductor in the VHF 100W filtering module is welded on a metal plate, and the metal plate is tightly connected to the outer shell of the integrated silver-plated copper structure by screws.

[0011] Further, in the VHF 10W filtering module, the VHF 100W filtering module, the UHF 10W filtering module, and the UHF 100W filtering module, the resonant inductor cavity is isolated from the drive circuit by a silver-plated copper plate, and a resonant cavity is formed with the upper part of the filtering module structure. The resonant inductor cavity is integrally silver-plated, and the corners of the resonant inductor cavity are arc-shaped; and the length and width dimensions of the resonant inductor cavity are 1.5 times the length and width dimensions of the resonant inductor; the capacitors in the resonant capacitor matrix are arranged in an arc shape and are connected in series with PIN diodes; the capacitance values of the capacitors are arranged in a binary mode, and the capacitance value of each capacitor is twice that of the previous one.

[0012] Further, in the VHF 100W filtering module, the PIN diodes are welded in a sandwich mode, and the sandwich mode is to be welded to the integrated silver-plated copper structure of the VHF 100W filtering module through a sandwich; in the UHF 100W filtering module, the PIN diodes are welded in a tight mode, and the tight mode is to be tightly welded to the integrated silver-plated copper structure of the UHF 100W filtering module.

[0013] Further, the power amplifier combiner further includes a VHF antenna interface; During transmission, the VHF band signal passes through the antenna combining rack, the VHF channels of the two VHF power amplifier units and / or the two VHF / UHF power amplifier units, and the VHF channel in the VHF / UHF combining unit, and is sent to the VHF antenna interface and transmitted through the antenna; during transmission, the UHF band signal passes through the antenna combining rack, the UHF channels of the two VHF / UHF power amplifier units, and the UHF channel in the VHF / UHF combiner unit, and is sent to the UHF antenna interface and transmitted through the antenna; during reception, when receiving in the VHF band, the VHF band signal received by the antenna is sent into the VHF channel of the VHF / UHF combining unit through the VHF antenna interface and enters at least one of the two VHF power amplifier units and / or the two VHF / UHF power amplifier units, and is split, filtered, and amplified by the low-noise amplifier in at least one of the two VHF power amplifier units and / or the two VHF / UHF power amplifier units and then enters the antenna combining rack and is sent to the radio for demodulation; during reception, when receiving in the UHF band, the UHF band signal received by the antenna is sent into the UHF channel of the VHF / UHF combining unit through the UHF antenna interface and enters at least one of the two VHF / UHF power amplifier units, and is filtered and amplified by the low-noise amplifier in at least one of the two VHF / UHF power amplifier units and then enters the antenna combining rack and is sent to the radio for demodulation.

[0014] Further, the VHF channels of the two VHF power amplifier units and the two VHF / UHF power amplifier units include a first filtering module, a first power amplifier module, and a first combining module; the UHF channels of the two VHF / UHF power amplifier units include a second filter module and a second power amplifier module; the VHF channel in the VHF / UHF combining unit includes a first harmonic filtering module and a first standing wave detection module; the UHF channel in the VHF / UHF combining unit includes a second combining module, a second harmonic filtering module, and a second standing wave detection module.

[0015] The beneficial effects of the present invention are as follows: The duplexer is redesigned, greatly reducing its volume and loss; broadening the operating frequency band to support more communication devices; enhancing the signal power amplification and filtering capabilities, effectively improving the communication ability when multiple devices work simultaneously and bringing better communication effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings are only for the purpose of illustrating specific embodiments and are not considered as a limitation of the present invention. Throughout the drawings, the same reference signs denote the same components. Obviously, the drawings in the following description are only some embodiments described in the embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings based on these drawings.

[0017] Figure 1 is a schematic diagram of the overall structure of the power amplifier duplexer provided by an embodiment of the present invention; Figure 2 is a schematic diagram of the structure of the VHF power amplifier unit of the power amplifier duplexer provided by an embodiment of the present invention; Figure 3 is a schematic diagram of the structure of the VHF / UHF power amplifier unit of the power amplifier duplexer provided by an embodiment of the present invention; Figure 4 is a schematic diagram of the composition of the filter module of the power amplifier duplexer provided by an embodiment of the present invention; Figure 5 is a schematic diagram of the structure of the VHF 100W filter module of the power amplifier duplexer provided by an embodiment of the present invention; Figure 6 is a schematic diagram of the structure of the UHF 100W filter module of the power amplifier duplexer provided by an embodiment of the present invention; Figure 7 is a schematic diagram of the PIN diode soldering of the VHF 100W filter module of the power amplifier duplexer provided by an embodiment of the present invention; Figure 8 is a schematic diagram of the PIN diode soldering of the UHF 100W filter module of the power amplifier duplexer provided by an embodiment of the present invention; Figure 9 is a schematic diagram of the integrated silver-plated copper structure of the UHF 100W filter module of the power amplifier duplexer provided by an embodiment of the present invention; Figure 10 is a schematic diagram of the comparison of the choke coil skeletons of the filters of the power amplifier duplexer provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] In order to provide an implementation solution for power amplification and combining, an embodiment of the present invention provides a power amplifier combiner. The following describes the preferred embodiments of the present invention with reference to the accompanying drawings of the specification. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention. And without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0019] The four-in-one power amplifier combiner is an important part of the vehicle communication platform. The VHF power amplifier unit, the VHF / UHF power amplifier unit, and the VHF / UHF combining unit can all achieve independent plugging and locking. Among them, the antenna combining rack part mainly realizes the conversion and supply of the power required by the whole machine, receives the radio frequency and control signals from the dual-channel communication host unit, analyzes the control signals, issues control instructions to the VHF and UHF band signal power amplification and combining modules, and transmits the band signals to the corresponding power amplifier units. The power amplifier unit realizes the amplification and filtering of the transmitted and received band signals. The four power amplifier units can be cascaded through radio frequency lines to realize the combination of multiple VHF channels and send them to the VHF / UHF combining unit. The two VHF / UHF power amplifier units and the VHF / UHF combining unit jointly realize the combination of two UHF band signals. The VHF / UHF combining unit is also responsible for the realization of the VHF and UHF antenna standing wave detection and open / short circuit protection functions.

[0020] An embodiment of the present invention provides a power amplifier combiner, as Figure 1 shown. The power amplifier combiner may include an antenna combining rack unit, a power amplifier (i.e., power amplification) unit, a combining unit, and an antenna unit, where: The antenna combining rack unit includes a control interface module, a radio frequency distribution module, and a power supply module.

[0021] The power amplifier unit includes two VHF power amplifier units and two VHF / UHF power amplifier units, and the combining unit is a VHF / UHF combining unit.

[0022] It should be noted that the power amplifier in the text is power amplification.

[0023] Figure 1 The power amplifier combiner 100 shown is interconnected with the communication host to realize the amplification and filtering functions of 4 VHF band signals and 2 UHF signals. The power amplifier combiner is interconnected with the UV antenna unit, amplifies multiple band signals and combines them to be transmitted through 1 UV antenna, and distributes the band signals with different frequencies received by 1 UV antenna to different channels. For the sake of simplicity, V in the accompanying drawings represents VHF, and U represents UHF.

[0024] The antenna combiners rack (including shock mounts) 111 completes the functions of radio control, RF access, filtering of the input power supply and voltage conversion, as well as the control function of the power amplification and combining module.

[0025] The VHF power amplifier units 101, 102, the VHF / UHF power amplifier units 103 and 104 together contain 4 VHF channels. The 4 VHF channels are combined and cascaded in the VHF band, and then output to the VHF antenna interface through the VHF / UHF combiner unit 105. The VHF / UHF power amplifier units 103 and 104 contain 2 UHF channels. The 2 UHF channels are cascaded in the UHF band, but the power amplifier units do not combine the UHF band signals. The 2 UHF channels are output to the VHF / UHF combiner unit for channel combination in the UHF band, and then output to the UHF antenna interface.

[0026] In the transmit mode: The input of the VHF power amplifier unit 101 is the first VHF band signal (i.e., the VHF band RF signal) from the antenna combiners rack. The output of the VHF power amplifier unit 101 is the input to the combining port of the VHF power amplifier unit 102. The VHF power amplifier unit 101 amplifies the power of the first VHF band signal input from the RF distribution module, and the power-amplified first VHF band signal is combined and input to the VHF power amplifier unit 102 through the first VHF channel.

[0027] The input of the VHF power amplifier unit 102 is the second VHF band signal from the antenna combiners rack and the power-amplified first VHF band signal from the VHF power amplifier unit 101. The VHF power amplifier unit 102 amplifies the power of the second VHF band signal input from the RF distribution module, and the power-amplified second VHF band signal is combined and output to the VHF / UHF power amplifier unit 103 through the second VHF channel; if there is a first VHF band signal, the power-amplified first VHF signal received from the VHF power amplifier unit 101 is also combined and output to the VHF / UHF power amplifier unit 103 through the second VHF channel.

[0028] The input of the VHF / UHF power amplifier unit 103 is the third VHF band signal and / or the first UHF band signal (i.e., the UHF band RF signal) from the RF distribution module of the antenna combiners rack, and the input from the VHF power amplifier unit 2. The VHF / UHF power amplifier unit 103 amplifies the power of the third VHF band signal input from the RF distribution module, and the power-amplified third VHF band signal is combined and output to the VHF / UHF power amplifier unit 104 through the third VHF channel; if there is a first VHF band signal and / or a second VHF band signal, the power-amplified second VHF band signal and / or the first VHF band signal received from the VHF power amplifier unit 102 are also combined and output to the VHF / UHF power amplifier unit 104 through the third VHF channel. The VHF / UHF power amplifier unit 103 also amplifies the power of the first UHF band signal input from the RF distribution module, and the power-amplified first UHF band signal is output to the VHF / UHF combiner unit 105 through the UHF channel UPA1 for combination.

[0029] The input of the VHF / UHF power amplifier unit 104 is the fourth VHF band signal and / or the second UHF band signal from the RF distribution module of the antenna combiners rack, and the input from the VHF / UHF power amplifier unit 103. The VHF / UHF power amplifier unit 104 amplifies the power of the fourth VHF band signal input from the RF distribution module. The power-amplified fourth VHF band signal is combined with the VHF band signal input through the third VHF channel from the VHF / UHF power amplifier unit 103 and output to the combiner unit 105 through the fourth VHF channel. If there is a first VHF band signal and / or a second VHF band signal and / or a third VHF band signal, the power-amplified third VHF band signal and / or the second VHF band signal and / or the first VHF band signal received from the VHF power amplifier unit 103 are also output to the VHF / UHF combiner unit 105 through the fourth VHF channel.

[0030] Generally speaking, if the signal from the RF distribution module includes a UHF band signal, the first UHF band signal is power-amplified in the VHF / UHF power amplifier unit 103, and after power amplification, it is output to the combiner unit 105 through the UHF channel UPA1 for combination in the combiner unit; the second UHF band signal is power-amplified in the VHF / UHF power amplifier unit 104, and after power amplification, it is output to the combiner unit 105 through the UHF channel UPA2 for combination in the combiner unit 105. There is no order requirement for the first and second UHF band signals mentioned here.

[0031] Through the VHF combining cascade between the above two VHF power amplifier units and two VHF / UHF power amplifier units, it is possible to simultaneously support the power amplification and combining of four VHF band signals; through the UHF cascade between the two VHF / UHF power amplifier units, the power amplification of two UHF band signals can be achieved, and the combining of UHF band signals is achieved through the combining unit. Such a design broadens the working frequency band with a more streamlined hardware structure, supports more communication devices, and reduces the volume of the overall combiner.

[0032] The VHF channels (also known as VHF paths) of the VHF power amplifier unit and the VHF / UHF power amplifier unit include a filtering module, a power amplifier module, and a combining module; the UHF channels (also known as UHF paths) of the VHF / UHF power amplifier unit include a filter module and a power amplifier module; the VHF paths in the VHF / UHF combining unit include a harmonic filtering module and a standing wave detection module; the UHF paths in the VHF / UHF combining unit include a combining module, a harmonic filtering module, and a standing wave detection module.

[0033] Specifically, the VHF channels of the two VHF power amplifier units and the two VHF / UHF power amplifier units include a first filtering module, a first power amplifier module, and a first combining module; the UHF channels of the two VHF / UHF power amplifier units include a second filter module and a second power amplifier module; the VHF channels in the VHF / UHF combining unit include a first harmonic filtering module and a first standing wave detection module; the UHF channels in the VHF / UHF combining unit include a second combining module, a second harmonic filtering module, and a second standing wave detection module.

[0034] In one implementation, When transmitting in the VHF band, the VHF band signal passes through the antenna combining rack, the VHF paths of the VHF power amplifier unit and / or the VHF / UHF power amplifier unit, and the VHF paths (channels) in the VHF / UHF combining unit, and is sent to the VHF antenna interface and transmitted through the antenna; the power amplifier unit mentioned here can be any one or more of the two VHF power amplifier units and the two VHF / UHF power amplifier units, depending on the actual situation.

[0035] When transmitting in the UHF band, the UHF band signal passes through the antenna combining rack, the UHF paths of the VHF / UHF power amplifier unit, and the UHF paths in the VHF / UHF combiner unit, and is sent to the UHF antenna interface and transmitted through the antenna; the power amplifier unit mentioned here can be any one or more of the two VHF / UHF power amplifier units, depending on the actual situation.

[0036] When receiving in the VHF band, the VHF band signal received by the antenna is sent to the VHF path of the VHF / UHF combiner unit via the VHF antenna interface and enters the VHF power amplifier unit and / or VHF / UHF power amplifier unit. After being branched, filtered, and amplified by the combiner module in the power amplifier unit, it enters the antenna combiner rack and is then sent to the radio station for demodulation; the power amplifier unit mentioned here can be any one or more of the two VHF power amplifier units and the two VHF / UHF power amplifier units, and is used according to actual conditions.

[0037] When receiving in the UHF band, the UHF signal received by the antenna is sent to the UHF path of the VHF / UHF combiner unit through the UHF antenna interface and enters the VHF / UHF power amplifier unit. After being filtered and amplified by the low noise amplifier, it enters the antenna combiner rack and is sent to the radio for demodulation. The power amplifier unit mentioned here can be any one or more of the two VHF / UHF power amplifier units, depending on the actual situation. Figure 2 and Figure 3 It is a schematic diagram of the structure of the VHF power amplifier unit 200 and the VHF / UHF power amplifier unit 300.

[0038] like Figure 2 As shown, the VHF power amplifier unit at least includes a VHF radio frequency switching module 201, a VHF 10W filter module 202, a VHF power amplifier module 203, and a VHF combining module 204, and also includes an external interface module 205 and a switching module 206. The VHF power amplifier unit 200 is used in conjunction with the antenna combining rack 111 to realize independent fixed frequency and frequency hopping transceiver of each VHF power amplifier unit channel; it can realize the combining function of 2 to 4 VHF channels, that is, it can have independent fixed frequency and frequency hopping transceiver of 2 to 4 VHF channels.

[0039] The functions of each module of the VHF power amplifier unit are as follows: 1) VHF RF switching module 201 a) In the transmitting state, the RF switch is switched to realize the transmission signal from the 10W filter module to the power amplifier and then to the VHF combiner module 204; b) Complete the power detection of the transmission power at the power amplifier end and provide the detection value for the power closed loop; c) In the receiving state, the RF switch is used to achieve low-noise amplification of the received signal when single-receiving to improve the receiving index, and the receiving end is connected to a 10W filter module when multiple transmissions and multiple receptions are performed to improve the multiple transmission and multiple reception performance.

[0040] 2) VHF10W filter module 202 a) In the transmitting state, the VHF10W filter module 202 is connected to filter the transmitting signal, improve the harmonic index and broadband noise index of the whole machine, and enhance the multi-transmit and multi-receive performance; b) In the receiving state, when the whole device transmits multiple VHF band signals, the isolation between the transmitting channel and the receiving channel is improved, thereby filtering out the influence of the transmitting channel on the receiving channel.

[0041] 3) VHF amplifier module 203 When in the transmitting state, the input power signal is amplified so that the transmitting power index of the whole machine is met.

[0042] 4) VHF combiner module 204 a) When transmitting and receiving are realized, one VHF band signal is coupled and distributed through bridge 208 (VHF band bridge) into two VHF band signals with the same amplitude, 3 dB lower than the input and a phase difference of 90 degrees.

[0043] b) After passing through the VHF100W filter module 207, the two VHF band signals with the same amplitude and a phase difference of 90 degrees are coupled through the bridge 208 (VHF band bridge) to synthesize a VHF band signal with an amplitude 3dB higher than the input. Thus, the combining function of multiple VHF power amplifier units is realized through the reflection performance of the two ports of the bridge 208 in the combining module.

[0044] 5) Switching module 206 a) realizing the power supply input of the VHF power amplifier unit 200, and sending each voltage signal of the power module of the antenna combiner rack 111 to each module for use; b) Implementing the control input of the VHF power amplifier unit 200, and sending various control signals of the control module of the antenna combiner rack 111 to various modules for use.

[0045] 6) External interface module 205 a) Realize the output of RF input signal, antenna output and combined input of RF amplified signal; b) Realize the light control display of the module to read the working status of the equipment like Figure 3 As shown, the VHF / UHF power amplifier unit 300 includes a VHF / UHF10W filter module 301, a VHF / UHF power amplifier module 302, a VHF combiner module 303, an external interface module 304 and a switching module 305; wherein the VHF combiner module 303 also includes a VHF100W filter module 306.

[0046] The VHF / UHF power amplifier unit 300 is used in conjunction with the power amplifier antenna combiner rack 111, and has VHF channels and UHF channels that can independently receive and transmit at fixed frequencies and frequency hopping; it can realize the combining function of 2-4 VHF channels, that is, it can have independent fixed frequency and frequency hopping transmission and reception of 2V-4V channels. Different from the VHF channel, the combining of the UHF channel is not involved in the VHF / UHF power amplifier unit 300, and the unit only needs to realize the filtering and amplification of the receiving and transmitting signals.

[0047] The functions of each module of VHF / UHF amplifier unit 300 are as follows: 1) VHF / UHF RF switching module 308 Compared with the VHF radio frequency switching module 201, a UHF band radio frequency switch is newly added; The LNA used in the VHF RF switching module 201 is TQP3M9018, which has a frequency coverage of 20-4000 MHz and is suitable for use in the UHF band. Therefore, the LNA circuit in the VHF / UHF RF switching module 308 does not need to be redesigned; Furthermore, the UHF band also has the function of short-circuiting the 10W filter to optimize the dual-receiving indicators of the UHF band.

[0048] 2) VHF / UHF 10W filter module 301 a) Compared with the VHF 10W filter module 202, new 108-174M, 225-390M, 390-678M frequency hopping 10W filters are added; b) Compared with the VHF10W filter module 202, the newly added filter uses a single-pole four-throw RF switch to merge the input and output ports, and the number of module ports is consistent with that of the VHF10W filter module 202.

[0049] 3) VHF / UHF amplifier module 302 a) The VHF power amplifier module 203 contains only one 30-88MHz power amplifier element, and the VHF / UHF power amplifier module 302 will be designed with two power amplifier elements operating in the 30-512MHz and 512-678MHz frequency bands respectively; b) Although the segmented design of the power amplifier increases the cost and the number of switches in the RF switching module, it can make the power amplifier gain flatter and the port matching better, which is beneficial to improving the performance of the whole machine and reducing power consumption.

[0050] 4) VHF combiner module 303 It is completely consistent with the VHF combining module 204 in the VHF power amplifier unit 200 .

[0051] 5) Transfer module 305 a) Implement the power supply input of the VHF / UHF power amplifier unit 300, and send each voltage signal of the power supply module of the antenna combiners rack 111 to each module for use; b) Implement the control input of the VHF / UHF power amplifier unit 300, and send each control signal of the control module of the antenna combiners rack 111 to each module for use.

[0052] 6) External interface module 304 Implement the input and output of signals in each frequency band.

[0053] The VHF power amplifier units 101 and 102, and the VHF / UHF power amplifier units 103 and 104 all combine the VHF band signals. The UHF band signals are only power amplified in the VHF / UHF power amplifier units 103 and 104, and are combined only in the combiner unit outside the power amplifier unit. Therefore, both the VHF and VHF / UHF power amplifier units contain VHF combiner modules and do not contain UHF combiner modules.

[0054] In one embodiment, the filters are deployed in cavities. Each cavity is composed of a cover plate and a cavity body. The outer side of the cross-section of the cavity body is rectangular, and the inner side of the cross-section of the cavity body is a rounded rectangle; on the inner wall of the cavity, wave-absorbing materials can be arranged outside each filter of the filtering module to reduce the interference between filters; a silver-plated copper mesh can be arranged on the outer wall of the cavity to cover the gap between the cover plate and the filter cavity body.

[0055] Figure 4 Shown is a schematic diagram of the basic composition of the filtering module.

[0056] Generally speaking, the power amplifier combiner contains four types of filtering modules (filters): VHF 10W filtering module; VHF 100W filtering module; UHF 10W filtering module; UHF 100W filtering module; All these four types of filtering modules use frequency-hopping filters.

[0057] The 10W filtering module is used for power amplification, and the 100W filtering module is used for combining. The VHF 10W filtering module and the UHF 10W filtering module are provided in the VHF power amplifier unit and the VHF / UHF power amplifier unit. Only the VHF 100W filtering module is provided in the VHF combiner module included in both types of power amplifier units. The VHF 100W filtering module is located in the VHF combiner module and the VHF combiner module is located in the two VHF power amplifier units and the two VHF / UHF power amplifier units. The UHF 100W filtering module is located in the VHF / UHF combiner unit.

[0058] Such asFigure 4 As shown, the above four filtering modules are assembled in a three - layer stack. The three layers include a resonant inductor cavity 401, a resonant capacitor matrix 402, and a drive circuit 403.

[0059] Resonant inductor cavity 401: It includes two main resonant inductors of a double - tuned circuit and a cavity surrounding the inductors. The cavity is insulated from the drive circuit by a silver - plated copper plate, forms a resonant cavity with the upper part of the filter module structure. The resonant inductor cavity is entirely silver - plated, and the corners of the resonant inductor cavity are arc - shaped; and the length and width dimensions of the resonant inductor cavity are 1.5 times the length and width dimensions of the inductor.

[0060] Resonant capacitor matrix 402: The resonant capacitor matrix is mainly composed of PIN diodes and capacitors. The capacitors are arranged in an arc shape and are connected in series with the PIN diodes; by turning on or off the PIN diodes, the corresponding capacitors can be connected in or out. The capacitance values of the capacitors are arranged in a binary pattern, and the capacitance value of each path of capacitors is twice that of the previous one. In this way, the number of capacitors can be reduced as much as possible, the volume of the filter can be reduced, and thus the size of the entire combiner can be reduced.

[0061] Drive circuit 403: A switching circuit that provides a conduction voltage and a cut - off voltage for the PIN diodes of the capacitor matrix, thereby turning on or off the PIN diodes.

[0062] The three - layer stack assembly of the above four filtering modules can also be that the resonant inductor cavity 401, the resonant capacitor matrix cavity 402, and the drive circuit cavity 403 are stacked in sequence. Among them, a resonant inductor is provided in the resonant inductor cavity 401, a resonant capacitor matrix is provided in the resonant capacitor matrix cavity 402, and a drive circuit is provided in the drive circuit cavity 403.

[0063] Figure 5 It is a schematic structural diagram of a VHF 100W filter (filter module) 500.

[0064] The VHF 100W filter module 500 covers 30 MHz - 88 MHz. This operating frequency band determines that the inductance value of the resonant inductor is relatively large, the size of the inductor is on the larger side, and the Q value of the inductor is relatively low. The VHF 100W resonant inductor 502 uses silver-plated copper wire with a diameter greater than or equal to 2.5 mm and less than or equal to 3.5 mm, preferably 3 mm. Using silver-plated copper wire for the inductor can play a role in heat dissipation. To further solve the heat dissipation problem, the inductor is welded to a thick metal plate 503, and the metal plate 503 is tightly connected to the overall copper structure by screws to dissipate heat from the inductor. Preferably, the metal plate 503 can be a silver-plated copper plate. The overall copper structure is the external structure of the filter module, and the overall copper structure can be an integrally silver-plated copper structure. Compared with the conventional mode of welding the inductor on the printed circuit board, the inductor dissipates heat through the silver-plated copper plate 503, and the heat dissipation efficiency is greatly improved, with a significant effect on improving the operating temperature and reliability. At the same time, compared with the printed circuit board, the electromagnetic shielding effect of the silver-plated copper plate is also significantly improved, reducing the electromagnetic radiation intensity of the resonant inductor cavity 501. In the embodiment of the present invention, the resonant inductor in the VHF 10W filter module resonant inductor cavity is also silver-plated copper wire with a diameter greater than or equal to 1.2 mm and less than or equal to 1.7 mm, preferably 1.5 mm.

[0065] As Figure 5 shown, the VHF 100W filter module 500 adopts a three-layer stacked assembly, and the resonant inductor cavity 501, the resonant capacitor matrix 504, and the drive circuit 505 are stacked in sequence. The three-layer stacked assembly of the VHF 100W filter module 500 can also be that the resonant inductor cavity 501, the resonant capacitor matrix cavity 504, and the drive circuit cavity 505 are stacked in sequence, where a resonant inductor is provided in the resonant inductor cavity 501, a resonant capacitor matrix is provided in the resonant capacitor matrix cavity 504, and a drive circuit is provided in the drive circuit cavity 505.

[0066] Figure 6 is a schematic structural diagram of the UHF 100W filter (filter module) 600.

[0067] The UHF 100W filter module 600 has a frequency coverage of 225 MHz - 678 MHz. Its operating frequency is relatively high, and the distributed parameters of the lumped-parameter filter capacitors and the PIN diode matrix are large, so the main resonant inductance value needs to be extremely small. At the same time, the power capacity of this filter is large, so the resistance value of the resonant inductor should be small and the Q value should be very high. Conventional wound inductors, even those wound with silver-plated copper wire, cannot meet the requirements simultaneously. The resonant inductor 603 in the embodiment of the present invention uses thick silver-plated copper columns with a diameter range of about 7.1 mm to 8.1 mm. There are two silver-plated copper columns in the resonant inductor cavity 604 to achieve a double-tuned circuit. The coupling between the two inductors is achieved by using a silver-plated wire to bridge across.

[0068] As Figure 6As shown, the UHF 100W filtering module 600 also adopts a three-layer stacked assembly. The resonant inductor cavity 604, the resonant capacitor matrix 602, and the drive circuit 601 are stacked in sequence. Among them, the resonant inductor cavity 604 can be a silver-plated resonant inductor cavity. The drive circuit 601 is located in the drive circuit cavity, and the resonant capacitor matrix 602 is located in the resonant capacitor matrix cavity. The three-layer stacked assembly can also be that the resonant inductor cavity 604, the resonant capacitor matrix cavity 602, and the drive circuit cavity 601 are stacked in sequence. Among them, a resonant inductor is arranged in the resonant inductor cavity 604, a resonant capacitor matrix is arranged in the resonant capacitor matrix cavity 602, and a drive circuit is arranged in the drive circuit cavity 601. The stacked assembly not only makes the spatial layout reasonable and improves the volume utilization rate; at the same time, the entire module structure adopts an integrated silver-plated copper structure design, with excellent heat dissipation performance, low loss, and good electromagnetic shielding performance. The silver-plated copper column of the resonant inductor is directly welded to the entire copper structure housing, which can further improve the heat dissipation performance.

[0069] In the capacitor matrix, due to the existence of the on-resistance when the PIN diode is conducting, it has always been the main heat generation point of the filtering module. Therefore, it is particularly important to dissipate the heat of the PIN diode well. In the embodiments of the present invention: a) In the VHF 100W filtering module, the PIN diode adopts a sandwich welding mode, sandwiching the PIN diode between the silver-plated copper plate and the printed circuit board. Figure 7 is a schematic diagram of the PIN diode welding in the VHF 100W filtering module. As Figure 7 shown, both ends of the PIN diode are respectively welded to the silver-plated copper plate 701, and the silver-plated copper plate 701 is then fixed to the entire structure (housing) by screws. In this way, the heat of the PIN diode can be conducted to the entire module structure and dissipated. The structure here is an overall copper structure, for example, it can be an integrated silver-plated copper structure. Figure 7 In it, 701 is the silver-plated copper plate, 702 is the PIN diode welding position, and 703 is the resonant capacitor printed circuit board.

[0070] b) In the UHF 100W filtering module, the PIN diode adopts a mode of directly welding to the overall copper structure. One end of the PIN diode is welded to the structural part, and the other end is welded to the printed circuit board. The overall copper structure is the structure outside the filtering module, and in one embodiment, it is an integrated silver-plated copper structure. Figure 8 is a schematic diagram of the PIN diode welding in the UHF 100W filtering module. Figure 8 In it, 801 is the integrated copper structure, 802 is the PIN diode welded to the structure, and 803 is the resonant capacitor printed circuit board. Figure 9 The following shows a schematic diagram of the integrated silver-plated copper structure of the UHF 100W filtering module. As Figure 9As shown in the figure, the integrated silver-plated copper structure is provided with a step, which is 1 PIN tube body position higher than the printed circuit board, just fitting the size of the entire PIN tube, so as to make the structure more compact, further reduce the volume of the combiner, and is beneficial to heat dissipation.

[0071] Optionally, in order to further enhance the heat dissipation effect, an inductor slot can be set on the printed circuit board. The inductor is vertically installed in the inductor slot of the printed circuit board, and heat-conducting pads are used to cover the upper and lower ends of the inductor. Then, a copper plate is covered and attached to the heat-conducting pads. The heat-conducting pads are made of soft materials, so as to conduct all the heat of the inductor out of the filter module to the external structure. The external structure is equipped with a fan for real-time heat dissipation.

[0072] Figure 10 It is a comparison schematic diagram of the choke coil skeleton of the filter.

[0073] The choke coil of the filter has high requirements for the Q value. Otherwise, it will increase the insertion loss of the filter module and generate a large amount of heat on the choke coil, resulting in the burnout of the choke coil.

[0074] In the choke coil design of the filter module according to the embodiment of the present invention, a polytetrafluoroethylene skeleton is used for winding. The inductor wound with the polytetrafluoroethylene skeleton has a quite high Q value compared with other magnetic cores, which is basically equivalent to that of an air-core coil. The inductance of the choke coil is often relatively large, especially for the VHF filter module, and the choke coil is basically above 10 uH. The choke coil is wound with a polytetrafluoroethylene skeleton, so as to achieve the technical effect of a small volume of the choke coil.

[0075] In addition, compared with the conventional circular skeleton, the square skeleton is used for winding in this device. Since the volume of the filter module is limited, the square skeleton has more advantages and a higher space utilization rate. The comparison schematic diagram of the circular skeleton and the square skeleton is as Figure 10 shown. The circular skeleton is on the left and the square skeleton is on the right. With the same lateral diameter of the skeleton, the space utilization rate of the square skeleton is much higher.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. Any changes or replacements that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A power amplifier combiner, characterized in that, Including: An antenna combiners rack, two VHF power amplifier units, two VHF / UHF power amplifier units, and one VHF / UHF combiner unit; Among them, the two VHF power amplifier units and the two VHF / UHF power amplifier units are provided with a total of four VHF channels, and the four VHF channels are combined and cascaded in the VHF frequency band; the two VHF / UHF power amplifier units are provided with two UHF channels, and the two UHF channels respectively output the UHF frequency band signals after power amplification; And The VHF / UHF combiner unit combines the UHF frequency band signals after power amplification and outputs them to the UHF antenna interface.

2. The power amplifier combiner according to claim 1, characterized in that, The first VHF power amplifier unit among the two VHF power amplifier units amplifies the power of the first VHF frequency band signal and outputs the amplified first VHF frequency band signal to the second VHF power amplifier unit; The second VHF power amplifier unit among the two VHF power amplifier units amplifies the power of the second VHF frequency band signal and outputs the amplified second VHF frequency band signal and the amplified first VHF frequency band signal together to the first VHF / UHF power amplifier unit among the two VHF / UHF power amplifier units; The first VHF / UHF power amplifier unit among the two VHF / UHF power amplifier units amplifies the power of the third VHF frequency band signal and outputs the amplified first VHF frequency band signal, the amplified second VHF frequency band signal, and the amplified third VHF frequency band signal to the second VHF / UHF power amplifier unit among the two VHF / UHF power amplifier units; The second VHF / UHF power amplifier unit among the two VHF / UHF power amplifier units amplifies the power of the fourth VHF frequency band signal and combines and outputs the amplified first VHF frequency band signal, the amplified second VHF frequency band signal, the amplified third VHF frequency band signal, and the amplified fourth VHF frequency band signal to the VHF / UHF combiner unit; The first VHF / UHF power amplifier unit amplifies the power of the first UHF frequency band signal and outputs the amplified first UHF frequency band signal to the VHF / UHF combiner unit; The second VHF / UHF power amplifier unit amplifies the power of the second UHF frequency band signal and outputs the amplified second UHF frequency band signal to the VHF / UHF combiner unit.

3. The power amplifier combiner according to claim 1, characterized in that, The VHF power amplifier unit is provided with a VHF 10W filter module, a VHF power amplifier module, and a VHF combiner module; The VHF / UHF power amplifier unit is provided with a VHF / UHF 10W filter module, a VHF / UHF power amplifier module, and a VHF combiner module; Among them, a VHF 100W filter module is further provided in the VHF combiner module, and a UHF 100W filter module is further provided in the VHF / UHF combiner unit.

4. The power amplifier combiner according to claim 3, characterized in that, The power amplifier combiner includes the following four filter modules: VHF 10W filter module; VHF 100W filter module; UHF 10W filter module; UHF 100W filter module; Among them, the VHF 10W filtering module, the VHF 100W filtering module, the UHF 10W filtering module, and the UHF 100W filtering module are frequency-hopping filtering modules; and among them The VHF 100W filtering module is located in the VHF combining module, and the VHF combining module is located in the two VHF power amplifier units and the two VHF / UHF power amplifier units; The UHF 100W filtering module is located in the VHF / UHF combining unit; and among them The VHF 10W filtering module, the VHF 100W filtering module, the UHF 10W filtering module, and the UHF 100W filtering module are assembled in a three-layer stack. The three layers include a resonant inductor cavity, a resonant capacitor matrix, and a drive circuit.

5. The power amplifier combiner according to claim 4, characterized in that, The resonant inductor in the resonant inductor cavity of the UHF 100W filtering module is a silver-plated copper column with a diameter range greater than or equal to 7.1 mm and less than or equal to 8.1 mm; the resonant inductor in the resonant inductor cavity of the VHF 100W filtering module is a silver-plated copper wire with a diameter greater than or equal to 2.5 mm and less than or equal to 3.5 mm; the resonant inductor in the resonant inductor cavity of the VHF 10W filtering module is a silver-plated copper wire with a diameter greater than or equal to 1.2 mm and less than or equal to 1.7 mm.

6. The power amplifier combiner according to claim 5, characterized in that, The UHF 100W filtering module is an integrated silver-plated copper structure. Among them, the resonant inductor in the resonant inductor cavity is tightly welded to the outer shell of the integrated silver-plated copper structure; The resonant inductor in the VHF 100W filtering module is welded on a metal plate, and the metal plate is tightly connected to the outer shell of the integrated silver-plated copper structure by screws.

7. The power amplifier combiner according to claim 4, characterized in that, In the VHF 10W filtering module, the VHF 100W filtering module, the UHF 10W filtering module, and the UHF 100W filtering module, the resonant inductor cavity is isolated from the drive circuit by a silver-plated copper plate, forming a resonant cavity with the upper part of the filtering module structure. The resonant inductor cavity is integrally silver-plated, and the corners of the resonant inductor cavity are arc-shaped; and the length and width dimensions of the resonant inductor cavity are 1.5 times the length and width dimensions of the resonant inductor respectively; The capacitors in the resonant capacitor matrix are arranged in an arc shape and are connected in series with PIN diodes; the capacitance values of the capacitors are arranged in a binary pattern, and the capacitance value of each capacitor is twice that of the previous one.

8. The power amplifier combiner according to claim 4, characterized in that, In the VHF 100W filtering module, the PIN diodes are welded in a sandwich mode, and the sandwich mode is to be welded to the integrated silver-plated copper structure of the VHF 100W filtering module through a sandwich; In the UHF 100W filtering module, the PIN diodes are welded in a tight mode, and the tight mode is to be tightly welded to the integrated silver-plated copper structure of the UHF 100W filtering module.

9. The power amplifier combiner according to claim 1, wherein The power amplifier combiner further includes a VHF antenna interface; During transmission, the VHF-band signal passes through the antenna combining rack, the VHF channels of the two VHF power amplifier units and / or the two VHF / UHF power amplifier units, and the VHF channel in the VHF / UHF combining unit, and is sent to the VHF antenna interface and transmitted through the antenna. During transmission, the UHF-band signal passes through the antenna combining rack, the UHF channels of the two VHF / UHF power amplifier units, and the UHF channel in the VHF / UHF combiner unit, and is sent to the UHF antenna interface and transmitted through the antenna. During reception, when receiving in the VHF band, the VHF-band signal received by the antenna is sent through the VHF antenna interface into the VHF channel of the VHF / UHF combining unit and enters at least one of the two VHF power amplifier units and / or the two VHF / UHF power amplifier units. After being split, filtered, and amplified by the low-noise amplifier in at least one of the two VHF power amplifier units and / or the two VHF / UHF power amplifier units, it enters the antenna combining rack and then is sent to the radio for demodulation. During reception, when receiving in the UHF band, the UHF-band signal received by the antenna is sent through the UHF antenna interface into the UHF channel of the VHF / UHF combining unit and enters at least one of the two VHF / UHF power amplifier units. After being filtered and amplified by the low-noise amplifier in at least one of the two VHF / UHF power amplifier units, it enters the antenna combining rack and then is sent to the radio for demodulation.

10. The power amplifier combiner according to claim 9, wherein The VHF channels of the two VHF power amplifier units and the two VHF / UHF power amplifier units include a first filtering module, a first power amplifier module, and a first combining module. The UHF channels of the two VHF / UHF power amplifier units include a second filter module and a second power amplifier module. The VHF channel in the VHF / UHF combining unit includes a first harmonic filtering module and a first standing wave detection module. The UHF channel in the VHF / UHF combining unit includes a second combining module, a second harmonic filtering module, and a second standing wave detection module.

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