Title :
Active tuning and miniaturization of microstrip antennas
Author :
Bhuiyan, Ekram H. ; Park, Yong-Hee ; El-Ghazaly, Samir ; Nair, Vijay ; Goronkin, Herb
Author_Institution :
ATMEL Corp., San Jose, CA, USA
Abstract :
The objective of this paper is to introduce two aspects of printed planar antennas, miniaturization and tuning of the resonant frequency. When varactor diodes are used as capacitive loads for the antenna, it allows reducing the size of the antenna with an added feature of tunability. By varying the biasing voltage of the varactors, resonant frequency can be varied over wide range. The positions of the varactors also have influence on the resonant characteristics of the patch antenna. Various characteristics of patch antenna such as resonant frequency, input impedance, current distribution, cross polarization and radiation pattern for different varactor positions are studied using the full-wave finite difference time domain (FDTD) approach. Varactors are characterized by their equivalent circuits and incorporated as lumped elements in the FDTD method.
Keywords :
antenna radiation patterns; capacitance; current distribution; electric impedance; electromagnetic wave polarisation; equivalent circuits; finite difference time-domain analysis; microstrip antennas; tuning; varactors; active tuning; biasing voltage; capacitive loads; cross polarization; current distribution; equivalent circuits; finite difference time domain method; full-wave FDTD approach; input impedance; lumped elements; microstrip antenna miniaturization; printed planar antennas; radiation pattern; resonant frequency tuning; varactor diodes; Diodes; Finite difference methods; Loaded antennas; Microstrip antennas; Patch antennas; Planar arrays; Resonant frequency; Tuning; Varactors; Voltage;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2002. IEEE
Print_ISBN :
0-7803-7330-8
DOI :
10.1109/APS.2002.1016914
