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On the efficiency of frequency reconfigurable high-Q antennas for 4G standards

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3 Author(s)
Del Barrio, S.C. ; Dept. of Electron. Syst., Aalborg Univ., Aalborg, Denmark ; Pelosi, M. ; Pedersen, G.F.

In the actual context of reducing antenna size and operating in multiple bands tunable antennas are investigated. Moreover, high-Q and low-Q tunable antennas are compared with respect to their efficiency. The loss issue that tunable high-Q antennas present is addressed. Using a variable capacitor as a tuning mechanism, simulations and measurements of a self-resonating antenna show the mismatch and the radiation efficiencies of the high-Q and the low-Q antennas. The investigated frequencies are in the low band of the 4G standard. Measurements are conducted for different tuning stages and the study shows that the high-Q design performs worse than the low-Q one. A 1.4 dB degradation in total efficiency is observed for a high-Q antenna in a tunable system.

Published in:

Electronics Letters  (Volume:48 ,  Issue: 16 )

Date of Publication:

August 2 2012

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