CN201260151Y

CN201260151Y - RF power amplifier for Dvor system

Info

Publication number: CN201260151Y
Application number: CNU2008201419807U
Authority: CN
Inventors: 张宝军; 崔同茂
Original assignee: Tianjin 764 Communication and Navigation Technology Corp
Current assignee: Tianjin 764 Communication and Navigation Technology Corp
Priority date: 2008-09-19
Filing date: 2008-09-19
Publication date: 2009-06-17
Anticipated expiration: 2018-09-19

Abstract

The utility model relates to an RF power amplifier used in a Dvor system, which comprises two radio-frequency power amplification circuits, distribution matching circuits and composition matching circuits, wherein two paths of output ends of the distribution matching circuits are respectively connected with the input ends of both of the radio-frequency power amplification circuits, and the output ends of both of the radio-frequency power amplification circuits are respectively connected with both of the input ends of the composition matching circuits. The utility model has the advantages of simple circuit structure, smaller volume, stability and practicality, thereby improving the reliability of a transmitter and obviously improving the technical targets of the transmitter of the Dvor system. The utility model meets the requirements of different power levels for users. The work frequency is from 105 MHz to 120 MHz, the normal work power is 100 W, and the largest output power is 150W (the largest modulation degree of modulated waves is 70 percent); distortion is smaller than or equal to 3%; and the utility model has over-temperature protection and unbalance protection.

Description

The RF power amplifier of Dvor system

Technical field

The utility model relates to a kind of aviation field, particularly a kind of RF power amplifier that is applied in the Dvor system in civil aviaton's navigation.

Background technology

The RF power amplifier of Dvor (the Doppler's very high frequency(VHF) omni-directional beacon) system of existing civil aviaton navigation application, be that the 1970s and 1980s is from external introduction always, because it is of long duration, equipment is backward relatively, its technology adopts multichannel power synthetic technique (four tunnel) more, distribution/synthesizer is used more, and has used a large amount of discrete components, and the circuit volume is big, power consumption is big; And lumped-parameter element is all used in impedance matching, and reliability is low, cost is high, circuit is complicated, makes RF power amplifier job insecurity, and technical indicator is low; The amplifier operate as normal power of this mode is 50W, and maximum power is 100W, and power is relatively low.

Summary of the invention

In view of the deficiency that prior art exists, the utility model provides employing two-way power synthetic technique, uses microstrip line to carry out Circuit Matching, makes circuit reduction, stable, practical, the RF power amplifier of Dvor system reliably.

The technical scheme that the utility model is taked for achieving the above object is: the RF power amplifier of Dvor system, it is characterized in that comprising two RF power amplification circuits, distribute match circuit and synthetic match circuit, the two-way output of described distribution match circuit is connected with two RF power amplification circuit inputs respectively, and the output of two RF power amplification circuits is connected with two inputs of synthetic match circuit respectively

The beneficial effects of the utility model are: circuit structure is simplified, volume reduces simultaneously, and stable practical, thereby the transmitter reliability is improved, Dvor system transmitter its technical index is had clear improvement and improve, satisfied the needs of user in the different capacity grade.

Technical indicator is: operating frequency: 105MHz-120MHz, operate as normal power are 100W, and Maximum Power Output is 150W (amplitude-modulated wave, a maximum percentage modulation 70%); Distortion is smaller or equal to 3%; Overheat protector is arranged, unbalance protection.

Description of drawings

Fig. 1 is that circuit of the present utility model connects block diagram and as Figure of abstract.

Embodiment

As shown in Figure 1, the RF power amplifier of Dvor system, comprise two RF power amplification circuit I, 2, distribute match circuit and synthetic match circuit, distribute the two-way output of match circuit to be connected with RF power amplification circuit I, 2 inputs respectively, RF power amplification circuit I, 2 output are connected with two inputs of synthetic match circuit respectively.Wherein RF1, RF2 amplifying circuit are the identical amplifying circuits of two-way, are to adopt BLF247 radio frequency amplifier tube, carry out designing impedance matching by microstrip line and form, and make its power requirement can satisfy the requirement of current use system.

The utility model adopts the two-way power synthetic technique, uses microstrip line to carry out the circuit impedance coupling; The calculating of microstrip line and printed board material, dielectric constant, the thickness of printed board, the input and output impedance, and the place operating frequency is relevant; Calculate length, the width of required microstrip line according to above-mentioned parameter, thereby finish the impedance matching of amplifying circuit, adopt microstrip line to carry out impedance matching here, reduced the volume of circuit, simplified by resolution element and mated the complexity of bringing to circuit.Power synthetic technique is to use the self-control transformer, this transformer is that the application coaxial cable is made characteristic impedance and amplifying circuit is exported, the suitable line transformer of sending-end impedance, in the transmission line principle of high band, go into the distribution of 4:1 and 1:4 and the line transformer that synthesizes; This line transformer is 4:1 and 1:4 with respect to impedance, and is 1:2 and 2:1 for power, thereby realizes the distribution of power and synthetic; Make circuit reliable and stable by above enforcement, improved the index of transmitter and the index of complete machine.

Operation principle is as follows: input is the carrier radio frequency signal from modulator 108MHz-118MHz, size is about 3W, through distributing match circuit to be divided into equal two paths of signals, enter RF1, RF2 amplifying circuit respectively, amplification through RF1, RF2, obtain the two paths of signals of 50W respectively, this two paths of signals enters synthetic match circuit respectively, thereby the synthetic radio-frequency carrier signal that obtains the needed 100W power grade of Doppler VHF omnirange system has satisfied Doppler VHF omnirange system complete machine needs.

Claims

1. the RF power amplifier of a Dvor system, it is characterized in that, comprise two RF power amplification circuits (1,2), distribute match circuit and synthetic match circuit, the two-way output of described distribution match circuit is connected with RF power amplification circuit (1,2) input respectively, and the output of RF power amplification circuit (1,2) is connected with two inputs of synthetic match circuit respectively.