Microstrip bandpass single‐pole quadruple‐throw switch and independently switchable quadruplexer

Abstract

Two switchable microstrip bandpass circuits are investigated. Owing to the low loading effect from the distributed coupling technique, many channels are obtained without a complicated matching network. Each passband can be turned on and off independently. Both the bandpass single‐pole quadruple‐throw switch and the switchable quadruplexer consisting of asymmetrical quarter‐wavelength resonators, shunt open stubs and p‐i‐n diodes feature compactness, high isolation and wide stopband. The isolation is better than 35 dB, and the 20‐dB stopband extends up to 13 times of the lowest operation centre frequency. To validate this design concept, theory as well as experiment are presented and compared.

Microstrip triplexer and switchable triplexer using new impedance matching circuits

“…The channel filter in Ref. is the second‐order filter, so that its bandwidth is narrower and the circuit size is more compact. Compared with the author's previous work in Ref.…”

“…To reduce the circuit size, the cost, and the mismatching losses, the switchplexer, which combines the functions of multiplexer and switch is need. Some switchplexers have been reported in recent years . The common resonator are designed to be switchable, so that the switchable quad‐channel diplexer in Ref.…”

“…Some switchplexers have been reported in recent years. 4,[7][8][9] The common resonator are designed to be switchable, so that the switchable quad-channel diplexer in Ref. 4 has four operation states.…”

Design of Microwave Microstrip Multiband Diplexers for System in Package

“…To implement a wide-stopband diplexer, widestopband bandpass filters are studied first. To save circuit size and obtain wide stopband, stepped-impedance resonators are employed [13]- [15]. For stepped-impedance resonators, fundamental frequency and higher order mode frequencies are controlled by various combinations of impedance ratios and length ratios.…”

“…and Q e7 or 8 = 24.08, where the required input and output external quality factors are equal to g 0 g 1 and g 2 g 3 divided by fractional bandwidth, respectively. These parameters could be obtained by adjusting the dimensions of resonators and feeding lines [15]. The coupling coefficients M i j for resonators i and j can be calculated by…”