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Millimeter wave solid-state power combining technology research

Author: WangLei
Tutor: XuJun
School: University of Electronic Science and Technology
Course: Radio Physics
Keywords: Millimeter wave Solid state Power Amplifier Branch waveguide coupler Power divider / combiner
CLC: TN73
Type: Master's thesis
Year: 2011
Downloads: 121
Quote: 1
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Abstract

With the rapid development of satellite communications , electronic warfare systems and phased array radar , the increasingly high demand for the output power of the millimeter-wave systems , large output power means longer communication distance and stronger anti-interference ability . Due to the output power of a single solid-state devices , there is always a certain limit , which requires power synthesis technology . This article studies the waveguide T- junction , 3dB branch waveguide coupler waveguide magic T power divider and the use of the electromagnetic field simulation software CST and HFSS modeling and optimization simulation , and analysis of the advantages and disadvantages of the various power divider comprehensive utilization the waveguides ET knot splitters with low insertion loss and branch waveguide directional coupler high isolation characteristics designed eight-way power divider / combiner network . And , according to the project needs analysis and optimization simulation waveguide - microstrip - probe transition , , waveguides - very finline - microstrip transition . It also discusses the main factors to affect the the Power Amplifier synthesis efficiency . Input of the two-stage driver amplifier module and power combining amplifier module, each amplifier individually finished , attenuation chips are used in the driver stage amplifier AGC and stepping adjustment , the system is designed on the basis of the above work the outputs are added a detector for monitoring the input and output signal power . TGA-4505 high-power MMIC chip production eight-way power combining amplifier , each power chip alone do form a power amplifier module in a cavity inside , and eight-way power divider / combiner network based on the interaction between the various modules exist independently . Last creative design power divider / combiner network topology , the driver stage amplifier module , input output detector circuit is placed in a cavity with a novel structure , maintenance convenient, high reliability , easy to extend . MCU control circuit last used by a unit to achieve a negative pressure protection , automatic gain control , stepper control functions , tested the entire band synthetic power greater than 43.4dBm, the largest synthetic efficiency of up to 90 % , with a very good thermal performance and good engineering application value.

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