W-band waveguide-packaged InP HEMT reflection grid amplifier |
| |
| Authors: | Younkyu Chung Chun-Tung Cheung DeLisio M.P. Rutledge D.B. |
| |
| Affiliation: | California Inst. of Technol., Pasadena, CA, USA; |
| |
| Abstract: | 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 85GHz range. In conjunction with the OMT, a mode converter with quadruple-ridged apertures was designed to enhance the field uniformity over the active grid. Measurements show 5-dB small signal gain at 79GHz and an 800-MHz 3-dB bandwidth. The amplifier generates an output power of 264mW with little evidence of saturation. |
| |
| Keywords: | |
|
|
