Abstract
Microwave radio relay repeaters require the use of band-pass filters which match closely the impedances of the interconnecting transmission lines and which suppress adjacent channels adequately. A type of structure culled a Maximally-Flat filter meets these requirements. The ladder network which gives a maximally-flat insertion loss characteristic is discussed and several methods of achieving its counterpart in microwave transmission lines are presented. Resonant cavities are used to simulate tuned circuits and the necessary formulas relative to this approximate equivalence are given. Experimental data confirm the theory and show that this technique yields remarkable impedance matches.
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