A Technique for Improving Cosite Compatibility

The basic theory of a multiresonant filter is discussed. Such filters can greatly improve cosite compatibility when connected between transmitter-receivers and their antennas. The equivalence of several filter circuit design variations is illustrated. A simple quantitative equation permitting the calculation of insertion loss in terms of bandwidth and circuit Q is provided. A universal "zero-loss" response curve for a multiresonant filter is also shown.