DocumentCode :
734689
Title :
Impact of neutralization on isolation in co-planar and back-to-back antennas
Author :
Venkatasubramanian, Sathya N. ; Linsheng Li ; Icheln, Clemens ; Ferrero, Fabien ; Luxey, Cyril ; Haneda, Katsuyuki
Author_Institution :
Dept. of Radio Sci. & Eng., Sch. of Electr. Eng., Aalto Univ., Espoo, Finland
fYear :
2015
fDate :
13-17 April 2015
Firstpage :
1
Lastpage :
5
Abstract :
The concept of neutralization or RF cancellation is a promising technique for isolation improvement between two closely spaced antennas. In this contribution, the neutralization technique is studied for increasing the isolation between two closely spaced dual-polarized patch antennas and between dual-polarized back-to-back patch antennas at 2.6GHz. The back-to-back antennas are proposed for in-band full-duplex relaying, where the antennas have to be isolated such that self-interference from its own transmission is cancelled with additional analog and digital cancellation. Off-the-shelf components are used and achievable isolation levels and realized isolation bandwidth are measured. Measurements show that isolation levels of 75 dB across a 5MHz band can be achieved between patch antennas on opposite sides of a back-to-back antenna using off-the-shelf power dividers/combiners and phase shifters connected between the feeds of the two antennas. When power is sampled directly from the second port of the dual-polarized antenna instead of using separate couplers, the realized isolation bandwidth is much smaller. Results show that neutralization can be used to improve antenna isolation in back-to-back antennas for enabling in-band full-duplex operation but the operational bandwidth is still limited.
Keywords :
antenna feeds; antenna radiation patterns; coplanar waveguide components; electromagnetic wave polarisation; microstrip antenna arrays; microstrip components; microwave phase shifters; planar antenna arrays; power combiners; power dividers; relay networks (telecommunication); RF cancellation; closely spaced dual-polarized patch antenna; coplanar antenna isolation improvement; dual-polarized back-to-back patch antenna feed; frequency 2.6 GHz; frequency 5 MHz; in-band full-duplex relaying; neutralization impact; off-the-shelf power combiner; off-the-shelf power divider; phase shifter; Antenna feeds; Antenna measurements; Gold; Ports (Computers); antenna isolation; in-band full-duplex; mutual coupling;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Antennas and Propagation (EuCAP), 2015 9th European Conference on
Conference_Location :
Lisbon
Type :
conf
Filename :
7228462
Link To Document :
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