Title :
Quasi-optical HEMT and MESFET self-oscillating mixers
Author :
Hwang, Vincent D. ; Itoh, Tatsuo
Author_Institution :
Dept. of Electr. & Comput. Eng., Texas Univ., Austin, TX, USA
Abstract :
Planar quasi-optical receivers that compactly integrate a coupled slot antenna and a HEMT or MESFET balanced self-oscillating mixer and on the same substrate for applications in microwave and millimeter-wave receiver arrays are discussed. Both the HEMT and the MESFET circuit are designed and demonstrated at X-band. The HEMT circuit exhibits an isotropic conversion gain of 4.5 dB and a noise figure of 6.5 dB. The isotropic conversion gain of the HEMT circuit is 7.5 dB higher than the mixer diode circuit previously reported.<>
Keywords :
Schottky gate field effect transistors; field effect transistor circuits; high electron mobility transistors; microstrip antennas; microwave antenna arrays; mixers (circuits); receivers; solid-state microwave circuits; 4.5 dB; 6.5 dB; 7.5 dB; EHF; HEMT; MESFET; SHF; X-band; balanced mixer; coupled slot antenna; isotropic conversion gain; microwave receiver arrays; millimeter-wave receiver arrays; planar quasioptical-receivers; self-oscillating mixers; Coupling circuits; Diodes; Gain; HEMTs; MESFET circuits; Microwave antenna arrays; Millimeter wave circuits; Noise figure; Receiving antennas; Slot antennas;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
