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http://dx.doi.org/10.5515/KJKIEES.2008.19.12.1394

Effects of Vibration on Passive Intermodulation Distortion in Mobile Base Station Antennas  

Park, Jin-Sung (Department of Electrical and Electronic Engineering, Yonsei University)
Jung, Soon-Young (SK Telecom)
Lee, Yong-Shik (Department of Electrical and Electronic Engineering, Yonsei University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.19, no.12, 2008 , pp. 1394-1401 More about this Journal
Abstract
This work investigates the effects of vibration on the passive intermodulation distortion characteristics of base station antennas for 800 MHz CDMA mobile communication systems. In general, base station antennas are located at high positions such as on building rooftops or iron towers. Thus the antennas are always affected by random vibrations, coming from various natural environmental factors such as rain and wind, or from living environmental factors such as vehicles and trains passing by. The measured intermodulation distortion characteristics before and after vibration accelerated degradation test show that vibrations are indeed the main cause for the intermodulation distortion performances of such antennas. To minimize the effects of vibrations, a new antenna design isptoposed that has an improved tolerance for vibrations. Experimental results show that the proposed antenna design dramatically reduces the degradation of the intermodulation distortion more than 35 dB.
Keywords
Passive Intermodulation Distortion; Intermodulation Distortion; Antenna; Vibration;
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