Title :
MEMS-based switched diversity antenna at 2.3 GHz for automotive applications
Author :
Sievenpiper, D. ; Song, H.J. ; Hsu, H.P. ; Tangonan, G. ; Loo, R.Y. ; Schaffner, J.
Author_Institution :
HRL Labs., Malibu, CA, USA
Abstract :
Our previous work is presented on diversity antenna experiments in the 2.3 GHz band, specifically for applications in the automotive environment. We describe the case of two-element position diversity, and we study the effects of the antenna positions on the amount of diversity gain. The presentation consists primarily of measurement data on a moving vehicle, with software post-processing to determine the effects of diversity combining. We present several diversity combining schemes, and describe a switched diversity circuit that we have built to address one of these schemes. An in-house developed SPDT MEMS switch, which has desirable insertion loss and isolation characteristics for the diversity switch, is shown. Also, a discussion on using a switch for the switched diversity antenna is included.
Keywords :
UHF antennas; cellular radio; diversity reception; micromechanical devices; mobile antennas; multipath channels; switching circuits; telecommunication computing; 2.3 GHz; GSM frame structure; SPDT MEMS switch; UHF; antenna positions; automotive environment; diversity combining; diversity gain; insertion loss; isolation characteristics; multipath environment; software post-processing; switched diversity antenna; switched diversity circuit; two-element position diversity; Antenna measurements; Application software; Automotive applications; Automotive engineering; Diversity methods; Diversity reception; Software measurement; Switches; Switching circuits; Vehicles;
Conference_Titel :
Wireless Personal Multimedia Communications, 2002. The 5th International Symposium on
Print_ISBN :
0-7803-7442-8
DOI :
10.1109/WPMC.2002.1088278
