Title :
Slot-antenna with switchable polarization
Author :
Fries, Matthias K. ; Gräni, Mischa ; Vahldieck, Rädiger
Author_Institution :
Lab. for Electromagn. Fields & Microwave Electron., Swiss Fed. Inst. of Technol., Zurich, Switzerland
Abstract :
Antennas in modern wireless communication systems are required to operate with different polarizations in order to adapt the system to various transmission environments. A novel PIN-diode switched planar slot-loop antenna is introduced which allows switching between linear and circular polarization with a single antenna element. A further advantage of this solution is its uniplanar structure which makes it easy to implement PIN-diodes. The antenna is designed for the 2.45 GHz range and achieves excellent performance with both types of polarization at the same frequency. Simulation and experimental results are shown for a uniplanar antenna with polarization switched between RHCP and LHCP and between circular and linear polarization. The EM simulation of the structure is done with ENSEMBLE from Ansoft. The non-ideal characteristics of the diodes are taken into account in the simulation.
Keywords :
UHF antennas; antenna radiation patterns; electromagnetic wave polarisation; loop antennas; microstrip antennas; p-i-n diodes; slot antennas; 2.45 GHz; Ansoft ENSEMBLE; PIN-diode; circular polarization; linear polarization; loop antenna; planar antenna; printed antenna; radiation pattern; slot-antenna; switchable polarization; uniplanar antenna; Circuits; Communication switching; Diodes; Frequency; Joining processes; Patch antennas; Polarization; Slot antennas; Slotline; Switches;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2002. IEEE
Print_ISBN :
0-7803-7330-8
DOI :
10.1109/APS.2002.1016117
