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| 11. |
Technical memorandum. Asymmetric TEM cell impedance calculation |
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IEE Proceedings H (Microwaves, Antennas and Propagation),
Volume 137,
Issue 5,
1990,
Page 318-320
E.Costamagna,
A.Fanni,
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PDF (289KB)
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摘要:
The impedance data presented in Reference 1 for asymmetric line structures, common in TEM cell design, are confirmed using data from numerical procedures for the inversion of the Schwarz-Christoffel (SC) formula. Some aspects of the impedance calculation methods are discussed, in particular those regarding the definition of auxiliary magnetic walls in the analysed geometries.
DOI:10.1049/ip-h-2.1990.0058
出版商:IEE
年代:1990
数据来源: IET
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| 12. |
Technical memorandum. Digital switching of mobile radio transmitter cavity resonators |
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IEE Proceedings H (Microwaves, Antennas and Propagation),
Volume 137,
Issue 5,
1990,
Page 321-324
A.Mahdi,
A.Khanifar,
D.P.Howson,
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PDF (405KB)
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摘要:
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 unloadedQwas optimised for a value greater than 13000 over the bandwidth. This was found to be sufficient for the intended applications. Switching speeds of 1.53μs and 0.8μs have been measured for the turn ‘on’ and turn ‘off’ transients, respectively. Measured and theoretical results show reasonable agreement.
DOI:10.1049/ip-h-2.1990.0059
出版商:IEE
年代:1990
数据来源: IET
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