Investigations in the vast 30,000-to 300,000-mc frequency range is proving that it can accommo date many of the communications services, especially where there is need for high-gain, high-directional antennas, and large bandwidth.
Certain wave-guide boundary value problems can be formulated in terms of lumped-constant circuits and distributed-constant transmission lines. Equivalent circuit voltages and currents can be introduced as measures of the transverse electric and magnetic fields. Making use of these concepts and Schwinger's integral equation method, the susceptance of a thin circular iris in circular cylindrical wave guide with the TM01 mode incident is discussed and calculated. Results are compared with experimental data.
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