Balanced quasi-elliptic-type combline diplexer with multiextracted-pole junction/output sections
IdentifiersPermanent link (URI): http://hdl.handle.net/10017/45191
Ministerio de Economía, Industria y Competitividad
Gómez García, R., Yang, L. & Muñoz Ferreras, J.M. 2020, "Balanced quasi-elliptic-type combline diplexer with multiextracted-pole junction/output sections", IEEE Microwave and Wireless Components Letters, vol. 30, no. 6, pp. 569-572
Transmission zero (TZ)
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/TEC2017-82398-R/ES/ARQUITECTURAS RADAR MULTI-MODO AVANZADAS CON INCORPORACION DE HARDWARE DE RADIOFRECUENCIA ULTRA-RECONFIGURABLE Y MULTI-FUNCIONAL/
info:eu-repo/grantAgreement/EC/H2020/754382/EU/GOT Energy Talent/GET
Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
© 2020 IEEE
A class of coupled-multiline quasi-elliptic-type balanced diplexer device with closely spaced channels and its balanced coupling-routing-diagram formalism to simultaneously model its differential- and common-mode operation are reported. It employs third-order combline-type bandpass filters (BPFs) in its filtering channels, whose resonating lines are connected at one of their extremes to the symmetry plane of the balanced-circuit structure (i.e., virtual grounds for the differential mode), along with a multiextracted-pole/coupled-multiline dual-band BPF junction and single-band BPF output cells. In differential-mode operation, the dual-band BPF junction adds one in-band pole to each diplexer channel and three transmission zeros (TZs) to both channels, whereas the single-band BPF output cells incorporate one in-band pole and two TZs in their corresponding channels. In this manner, increased-selectivity differential-mode BPF transfer functions for the diplexer channels when compared to those of its third-order combline-type BPFs are obtained. Grounded resistors are connected at the symmetry plane of the balanced diplexer for all the resonating lines of the combline-type BPFs, which become detuned with regard to the poles associated with the dual-band BPF junction and the single-band BPF output cells under common-mode excitation. This allows for high common-mode suppression levels in wide spectral ranges to be realized for both channels while maintaining the same TZs as in differential-mode operation. For practical-validation purposes, a 1.6-GHz/1.8-GHz microstrip prototype is manufactured and tested.
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