Journal
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Volume 59, Issue 5, Pages 1460-1471Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2011.2128851
Keywords
Left-handed materials; loop antenna; monopole antenna; reconfigurable antennas; tunable antennas
Funding
- MEC [TEC2006-13248-C04-04/TCM, TEC2009-14525-C02-01]
- European Action COST ASSIST [IC0603]
- Spanish Education Ministry
- [CCG06-UC3M/TIC-0803]
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Tunable left-handed (LH) wire antennas over a ground plane are presented in this paper. These antennas are small and have a wide tuning bandwidth and are matched to 50 Omega within the operation range. Two kinds of antennas have been developed: the monopole antenna and the half-loop antenna over ground plane. In both cases, the antennas are designed, manufactured and measured at fixed frequencies as a first step. After that, a study to replace some LH components with variable capacitors has been carried out for each antenna. Tunability over a wide bandwidth has been achieved. Finally, some prototypes of both antennas have been manufactured and measured. The tunable LH monopole antenna has been measured showing a monopolar radiation pattern with a 28% tuning bandwidth (695-924 MHz). Its radiation efficiency takes values between 50% and 70% within all the tuning bandwidth and the maximum dimension varies only between 0.11 lambda(0) at 695 MHz and 0.15 lambda(0) at 924 MHz. The tunable LH half-loop antenna over a ground plane has a radiation pattern with maximum radiation orthogonal to the ground plane. It has a 1.64:1 measured tuning bandwidth properly matched to 50 Omega (considering vertical bar s(11)vertical bar < -10 dB). Its measured radiation efficiency is always above 54% within the working bandwidth.
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