Effect of cooling on the probe system sensitivity for low signal strength RFI problems

Author

Guang-Hua Li ; Wei Huang ; Pommerenke, David

Author_Institution

EMC Lab., Missouri Univ. of Sci. & Technol., Rolla, MO, USA

fYear

2013

fDate

5-9 Aug. 2013

Firstpage

134

Lastpage

137

Abstract

Only highly sensitive probe systems can detect the weak field strengths that cause radio-frequency-interference (RFI) problems typically found within cell phones. The sensitivity of the probe systems depends on the probe factor and on the noise floor. The effect of cooling by liquid nitrogen on the received signal strength and the noise floor of three resonant probe systems has been investigated. They operate at the GSM, GPS, and WiFi frequency bands. Cooling increases the Q-factor of these resonant probes, increases the received signal, and lowers the noise floor. The sensitivity of the system, defined as the signal strength at which the Signal-to-Noise Ratio is equal to 0 dB improves by 3-6 dB.

Keywords

Q-factor; mobile handsets; radiofrequency interference; GPS frequency bands; GSM frequency bands; Q-factor; WiFi frequency bands; cell phones; highly-sensitive probe systems; liquid nitrogen cooling effect; low-signal strength RFI problems; noise floor; probe factor; probe system sensitivity; radiofrequency interference problem; received signal strength; resonant probe systems; signal-to-noise ratio; weak field strength detection; GSM; Global Positioning System; IEEE 802.11 Standards; Magnetic field measurement; Noise; Probes; Q-factor; Quality factor; radio-frequency interference (RFI); resonant magnetic field probe; signal-to-noise ratio;

fLanguage

English

Publisher

ieee

Conference_Titel

Electromagnetic Compatibility (EMC), 2013 IEEE International Symposium on

Conference_Location

Denver, CO

ISSN

2158-110X

Print_ISBN

978-1-4799-0408-2

Type

conf

DOI

10.1109/ISEMC.2013.6670396

Filename

6670396