基于柔性基片集成波导技术的Ka波段功率放大器的设计和制作

DESIGN AND FABRICATION OF Ka-BAND BROADBAND COMBINED POWER AMPLIFIER BASED ON FLEXIBLE SUBSTRATE INTEGRATED WAVEGUIDE TECHNOLOGY

设计、制作并测试了一个Ka波段八路合成宽带功率放大器.测试结果表明在26.5GHz上最大输出功率约为4.2W(连续波),在26.4GHz上最大合成效率约为72.5%,在25.1～28.4GHz范围内合成效率大于60%.这种功率放大器的基本组成单元是一对含对称尖劈过渡结构的柔性基片集成波导(FSIW).将一组该单元上的对称尖劈沿波导窄壁分别插入相应的输入和输出矩形金属波导,就可在波导内实现宽带、高效率的功率分配和功率合成.结果表明这项技术可方便地用于宽带毫米波固态功率放大器设计.

An eight-way power amplifier at Ka-band was designed, fabricated and measured. Measured results show that the maximum combined output power is 4.2W （continuous wave） at 26.5GHz. The power combining efficiency is higher than 60% over the interested frequency range （25.1～28.4GHz） and it can reach to 72.5% at 26.4GHz. The foundational cell of this amplifier is a double antipodal flexible substrate integrated waveguide （FSIW） including symmetrical dove-tail taper transition structure. A number of dove-tail tapers of these cells are stacked together and plugged along narrow wall into a couple of normal waveguides, a broadband power divider/combiner is then simply implemented with low insertion loss. The results demonstrate that this technique can be applied in broadband power combining amplifiers at millimeter-wave frequencies.