Open AccessPolarization‐Diversity Cross‐Shaped Patch Antenna for Satellite‐DMB Systems
Author(s) -
Lim JongHyuk,
Back GyuTae,
Yun TaeYeoul
Publication year - 2010
Publication title -
etri journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 46
eISSN - 2233-7326
pISSN - 1225-6463
DOI - 10.4218/etrij.10.0109.0280
Subject(s) - optics , circular polarization , polarization (electrochemistry) , pin diode , patch antenna , diode , microstrip antenna , axial ratio , linear polarization , physics , electrical engineering , optoelectronics , antenna (radio) , engineering , microstrip , laser , chemistry
A small reconfigurable patch antenna is proposed to achieve polarization diversity for digital multimedia broadcasting systems at 2.6 GHz. To obtain polarization diversity, a pair of on‐slit PIN diodes is inserted in each diagonal of a cross‐shaped patch. Thus, four PIN‐diodes on these slits are utilized to change the connection of the slits and thus achieve polarization. Bias circuits for the diodes are allocated in the cutting corner of the cross‐shaped patch to minimize the antenna size. The antenna produces left‐hand circular polarization, right‐hand circular polarization, or linear polarization, depending on the PIN‐diode status. Analysis of circular polarization operation is explicated. Measurements show a gain of about 1.5 dB, a cross polarization of about −20 dB, and an axial ratio of about 2.5 dB.