Novel Microstrip Multifunction Directional Couplers and Filters for Microwave and Millimeter-Wave Applications

Abstruct-The design of a new class of microstrip couplers and filters is presented in this paper. The synthesis functions obtained from the solution of first-order nonlinear differential equation of nonuniform lines with a loose coupling assumption are modified and validated for higher coupling values. The design employs a nonuniform coupled line… (More)