DocumentCode :
1555548
Title :
Digital switching of mobile radio transmitter cavity resonators
Author :
Mahdi, A. ; Khanifar, A. ; Howson, D.P.
Author_Institution :
Dept. of Electr. Eng., Bradford Univ., UK
Volume :
137
Issue :
5
fYear :
1990
fDate :
10/1/1990 12:00:00 AM
Firstpage :
321
Lastpage :
324
Abstract :
The design of a digitally switched mobile radio transmitter cavity resonator operating at 909 MHz is presented. By using only two loop transitions between the cavity and two switchable TEM coaxial resonators mounted external to the cavity, a total of ten different frequencies has been selected over a bandwidth of 2.5 MHz. Cavity unloaded Q was optimised for a value greater than 13000 over the bandwidth. This was found to be sufficient for the intended applications. Switching speeds of 1.53 mu s and 0.8 mu s have been measured for the turn ´on´ and turn ´off´ transients, respectively. Measured and theoretical results show reasonable agreement.
Keywords :
Q-factor; cavity resonators; mobile radio systems; radio transmitters; switching; 0.8 mus; 1.53 mus; 2.5 MHz; 900 MHz; Q-factor; TEM coaxial resonators; UHF; base station; digital switching; mobile radio transmitter cavity resonator; turn-off transients; turn-on transients;
fLanguage :
English
Journal_Title :
Microwaves, Antennas and Propagation, IEE Proceedings H
Publisher :
iet
ISSN :
0950-107X
Type :
jour
Filename :
58837
Link To Document :
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