Method of spurious mode compensation applied to manifold multiplexer design

Development of an electromagnetic tool for the accurate synthesis of manifold multiplexers: The dynamic inverter

“…In these conditions, the E110 mode perturbates the other channels of the multiplexer. Experimental studies show that the broadband response of a short-circuited cavity and of the filter are almost the same [5]. Furthermore, the resonant frequency of the E110 mode does not depend neither on the penetration of the tuning screws, nor on the cavity length.…”

“…Moreover, due to the complexity of the structure, a CAD model is necessary to reproduce a reliable behaviour of the overall circuit in the whole frequency band in order to avoid a long and expensive experimental adjustment. Several multiplexer design techniques have been presented for synthesising the multiplexer parameters in agreement with prescribed specifications [1][2][3][4][5]. Simple and fast equivalent networks, using electrical models for both the filters and the manifold, are used as a starting point for the optimisation; however, these models are not accurate enough.…”

Parallel Channels Using Frequency Multiplexing Techniques

“…Reversing the principle by blocking out of sub-band frequencies using band-stop filters has also been shown. (Bariant et al, 2002) presents a microstrip duplexer using band-stop filters. The band-stop filtering is achieved using open circuit stubs.…”

A Frequency Triplexer for Ultra-Wideband Systems Utilizing Combined Broadside- and Edge-Coupled Filters

“…Reference [8] presents a lumped element and manifold microwave multiplexer using the high-temperature superconductor technology. Reference [9] presents a microstrip duplexer using band-stop filters. The band-stop filtering is achieved using open circuit stubs.…”