W-band waveguide-packaged InP HEMT reflection grid amplifier

Younkyu Chung, Chun-Tung Cheung, M.P. DeLisio, D.B. Rutledge
2006 IEEE Microwave and Wireless Components Letters  
This letter presents a 79-GHz broadband reflection-type grid amplifier using spatial power combining to combine the power of 64 unit cells. Each unit cell uses a two-stage cascade configuration with InP HEMTs arranged as a differential pair. A broadband orthogonal mode transducer (OMT) separates two orthogonally polarized input and output signals over a 75 to 85 GHz range. In conjunction with the OMT, a mode converter with quadruple-ridged apertures was designed to enhance the field uniformity
more » ... ver the active grid. Measurements show 5-dB small signal gain at 79 GHz and an 800-MHz 3-dB bandwidth. The amplifier generates an output power of 264 mW with little evidence of saturation. Index Terms-Grid amplifier, mode converter, orthogonal mode transducer (OMT), spatial power combining.
doi:10.1109/lmwc.2006.875629 fatcat:blpfzhh4lvff3ossz2wteyoy4u