Title :
A 23–37 GHz Miniature MMIC Subharmonic Mixer
Author :
Lin, Che-Hung ; Lai, Yu-Ann ; Chiu, Jui-Chieh ; Wang, Yeong-Her
Author_Institution :
Nat. Cheng-Kung Univ., Tainan
Abstract :
A novel configuration of subharmonic mixer using an anti-parallel diode pair is presented for operating over the 23-37 GHz band. The monolithic microwave integrated circuit is implemented by GaAs 0.15 mum PHEMT technology with the compact size of 0.85 times 0.85 mm2. This mixer employs a directional coupler, LC low-pass filter, and a short stub for isolating three ports corresponding to radio frequency (RF), local oscillation (LO) input, and intermediate frequency (IF) output ports. The directional coupler also provides impedance transformation between the diode pair, RF, and LO ports. This makes the subharmonic mixer more compact and flexible. The best conversion loss of the subharmonic mixer is 9.4 dB, and the LO-to-RF and LO-to-IF isolations are better than 22 and 31 dB, respectively.
Keywords :
HEMT integrated circuits; III-V semiconductors; MMIC mixers; directional couplers; gallium arsenide; low-pass filters; GaAs - Interface; GaAs PHEMT technology; LC low-pass filter; antiparallel diode pair; directional coupler; frequency 23 GHz to 37 GHz; loss 9.4 dB; miniature MMIC subharmonic mixer; monolithic microwave integrated circuit mixer; short stub; Diodes; Directional couplers; Gallium arsenide; Integrated circuit technology; MMICs; Microwave integrated circuits; Mixers; Monolithic integrated circuits; PHEMTs; Radio frequency; Directional coupler; PHEMT; monolithic microwave integrated circuit (MMIC); subharmonic mixer;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2007.903460
