Title :
Propagation comparisons at VHF and UHF frequencies
Author :
Zhang, Xiaohu ; Burress, Thomas Weston ; Albers, Keith B. ; Kuhn, William B.
Author_Institution :
Kansas State Univ., Manhattan, KS
Abstract :
This paper presents and compares measured propagation data taken at four unlicensed-band frequencies including 151 MHz, 433 MHz, 902 MHz and 2400 MHz. A custom 10 mW signal source was used as the transmitter, and a spectrum analyzer as the receiver to provide accuracy to within 1 dB and sensitivity to better than -120 dBm. Both monopole and low-gain directional antennas were employed to represent expected use in an Energy Harvesting application. The measurement environment included both indoor and outdoor features. A range of up to 1.5 km at the lower frequencies was achieved. The path-loss exponent was found to be approximately three to five and relatively independent of the operating band. Results confirm that lower frequencies are preferred for low-power applications when omni-directional and low gain antennas are used.
Keywords :
UHF antennas; VHF antennas; directive antennas; energy harvesting; monopole antennas; spectral analysers; UHF frequencies; VHF frequencies; energy harvesting; frequency 151 MHz; frequency 2400 MHz; frequency 433 MHz; frequency 902 MHz; low-gain directional antennas; monopole antennas; omni-directional antennas; path-loss exponent; spectrum analyzer; Antenna measurements; Antennas and propagation; Dipole antennas; Frequency measurement; Radio transmitters; Radiofrequency integrated circuits; Transmitting antennas; UHF circuits; UHF propagation; VHF circuits; Radio; UHF; VHF; antenna; path loss; propagation; transmitter circuit;
Conference_Titel :
Radio and Wireless Symposium, 2009. RWS '09. IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
978-1-4244-2698-0
Electronic_ISBN :
978-1-4244-2699-7
DOI :
10.1109/RWS.2009.4957352