Title :
Capacitively center-loaded transmission lines for compact E-band 90° couplers
Author :
Haroun, Ibrahim ; Plett, Calvin
Author_Institution :
Commun. Res. Centre Canada, Ottawa, ON, Canada
Abstract :
A compact 80-GHz band (81-86 GHz) 90° coupler using capacitively center-loaded microstrip transmission lines is proposed. The coupler is implemented in a 0.15 μm GaAs pHEMT technology and has longitudinal and transverse arms of the same characteristic impedances of 50-Ω to reduce the effect of manufacturing tolerance and to facilitate the layout. The experimental results demonstrated a phase difference close to 87o and an amplitude imbalance of less than 1 dB over the entire frequency band of interest (81-86 GHz). The measured return loss is less than -11 dB and the isolation is better than 15 dB. The proposed coupler is well suited for low-cost, high performance, ultra high data rate transceivers for E-band wireless communication systems.
Keywords :
III-V semiconductors; coplanar transmission lines; coplanar waveguides; electric impedance; gallium arsenide; high electron mobility transistors; microstrip lines; radio transceivers; waveguide couplers; GaAs; GaAs pHEMT technology; amplitude imbalance; capacitively center-loaded transmission lines; characteristic impedances; compact e-band 90° couplers; e-band wireless communication systems; frequency 80 GHz; frequency 81 GHz to 86 GHz; frequency band; layout facility; manufacturing tolerance; phase difference; size 0.15 mum; ultra high data rate transceivers; Couplers; Loading; Loss measurement; PHEMTs; Power transmission lines; Transmission line measurements; Wireless communication; 60 GHz band; 90-degree coupler; CPW transmission lines; capacitive loading;
Conference_Titel :
Microwave Conference Proceedings (APMC), 2011 Asia-Pacific
Conference_Location :
Melbourne, VIC
Print_ISBN :
978-1-4577-2034-5
