Title :
A millimeter-wave tunable transformer-based dual-antenna duplexer with 50 dB isolation
Author :
Chuang Lu ; Matters-Kammerer, Marion K. ; Mahmoudi, R. ; Baltus, Peter G. M.
Author_Institution :
Mixed-Signal Microelectron. Group, Eindhoven Univ. of Technol., Eindhoven, Netherlands
Abstract :
This paper presents a 30 GHz tunable transformer-based duplexer with dual-antenna configuration. By using orthogonal linearly-polarized antennas and the transformer-based duplexer, the transmitter and receiver duplexes the two antennas with orthogonal circularly-polarized signals. Furthermore, magnetic tuning is introduced to improve isolation in case of practical imbalances. Measurement results demonstrate an isolation of > 50 dB by the duplexer for 1 GHz bandwidth. The achieved noise figure (NF) is 4 dB and insertion loss in the TX path is 3.1 dB. The tunable duplexer occupies an active area of 0.25 mm × 0.25 mm.
Keywords :
microwave antennas; millimetre wave antennas; radio receivers; radio transmitters; transformers; bandwidth 1 GHz; dual-antenna duplexer; frequency 30 GHz; loss 3.1 dB; magnetic tuning; millimeter-wave tunable transformer; noise figure 4 dB; orthogonal circularly-polarized signals; orthogonal linearly-polarized antennas; receiver duplex; transmitter duplex; tunable transformer-based duplexer; Circuit faults; Coils; Directive antennas; Gain; Noise measurement; Tuning; Duplexer; Isolation; Magnetic Tuning; Millimeter-Wave; Transformer;
Conference_Titel :
Custom Integrated Circuits Conference (CICC), 2014 IEEE Proceedings of the
Conference_Location :
San Jose, CA
DOI :
10.1109/CICC.2014.6946040