This paper introduces two new topologies for rejecting the harmonics in microstrip ring resonator filters. I-' wxt one uses 50 s2 spur line filter structures placed at the input iind output of the ring to suppress the first harmonic. Second topology incorporates low-pass structures into the ring for elimination of the harmonics.
In little more than 10 years computer-aided design (CAD) of microwave circuits has moved from dumb terminals on mainframe computers t o PCs, and now t o powerful RlSC workstations. Commercial CAD software now integrates the various stages of microwave circuit design: schematic capture, simulation and layout. This paper reviews the different CAD packages that are available for microwave circuit design. The basic principles employed in the modelling of microstrip circuits are introduced and the reasons for the extensive use of frequency-domain simulations are explored. The developments in nonlinear, electromagnetic and system-level simulation methods are described.
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