Title :
A quasi-optical subharmonically-pumped receiver using separately biased Schottky diode pairs
Author :
Trong-Huang Lee ; Chen-Yu Chi ; East, J.R. ; Rebeiz, G.M. ; Haddad, G.I.
Author_Institution :
NASA/Center for Nat. Space Terahertz Technol., Michigan Univ., Ann Arbor, MI, USA
Abstract :
A novel quasi-optical planar subharmonically pumped receiver including a log-periodic antenna and an anti-parallel Schottky diode pair with independent bias is presented. The antenna and Schottky diode pair have a 20 /spl mu/m and 2.5 /spl mu/m wide split, respectively, for biasing considerations and an overlay capacitor for RF coupling. Millimeter-wave measurements at 91 GHz show that, at /spl plusmn/0.4 V bias, the separately biased subharmonic mixer requires 2-3 times less LO power than the zero-biased subharmonic mixer for the same 8 dB (SSB) conversion loss. At 180 GHz a similar LO power requirement reduction has been achieved, with a minimum conversion loss of 9.7 dB and noise temperature of 1850 K (DS8).<>
Keywords :
Schottky-barrier diodes; flip-chip devices; hybrid integrated circuits; microwave integrated circuits; mixers (circuits); 180 GHz; 2.5 micron; 20 micron; 8 dB; 9.7 dB; 91 GHz; anti-parallel Schottky diode pair; log-periodic antenna; millimeter-wave measurements; minimum conversion loss; mm-wave integrated circuits; noise temperature; overlay capacitor; quasi-optical subharmonically-pumped receiver; separately biased Schottky diode pairs; Amplitude modulation; Capacitors; Log periodic antennas; Millimeter wave measurements; Noise reduction; Radio frequency; Schottky diodes; Temperature;
Conference_Titel :
Microwave Symposium Digest, 1994., IEEE MTT-S International
Conference_Location :
San Diego, CA, USA
Print_ISBN :
0-7803-1778-5
DOI :
10.1109/MWSYM.1994.335239
