论文信息 - A compact 81–86 GHz branch line coupler using end-loaded transmission lines

A compact 81–86 GHz branch line coupler using end-loaded transmission lines

This paper presents a reduced-size 81-86 GHz branch line coupler using end-loaded transmission lines and implemented in a 0.15-μm GaAs HEMT technology. The fabricated coupler has a size-reduction of 50% in chip-area compared to a conventional branch line coupler. The measured results demonstrated a phase imbalance of 90° at 83 GHz with a phase error of less than +/-1° over the frequency band of interest. Over a frequency range of 81-86 GHz the measurements showed an amplitude imbalance of less than 1.1 dB, a return loss of less than -11 dB, and an isolation close to 15 dB. The obtained results confirm the potential of the proposed branch line coupler for low-cost, high performance, small size GaAs-based System-on-Chip radio transceivers for wireless and radio-over-fiber ultra high speed communication systems.

Ibrahim Haroun

[1] Dong-Hoon Shin,et al. Millimeter Wave Compact Branch Line Coupler Using Metal–Air–Metal Capacitors , 2005 .

[2] Da-Chiang Chang,et al. Experimental Analysis of a 60 GHz Compact EC-CPW Branch-Line Coupler for mm-Wave CMOS Radios , 2010, IEEE Microwave and Wireless Components Letters.

[3] Calvin Plett,et al. A V-band 90-nm CMOS low-noise amplifier with modified CPW transmission lines for UWB systems , 2010 .

[4] B. Gaucher,et al. Modeling and implementation of on-chip millimeter-wave compact branch line couplers in a BiCMOS technology , 2007, 2007 European Microwave Conference.

[5] Masahiro Muraguchi,et al. Reduced-size branch-line and rat-race hybrids for uniplanar MMIC's , 1990 .

[6] Calvin Plett,et al. A V-band 90-nm CMOS low-noise amplifier with modified CPW transmission lines for UWB systems , 2010, 2010 Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems (SiRF).