Synthesis of Narrowband Channel Filters Based on High-Q TE011-Mode Resonators for Satellite DVB-T/DVB-T2 TV Signal Relay Systems
Boris M. Kats1, Nikita M. Gerasimov1,Nikita A. Shkunov1 Kirill A. Sayapin1,2; 1Waveguide-based Systems LLC, 2Saratov State University, Saratov, Russia
Abstract
This paper investigates the feasibility of synthesizing narrowband Ku-band bandpass filters (BPFs) based on hollow modified cylindrical resonators (MCRs) operating in high-Q TE011 modes. Such filters, with narrow fractional bandwidths ranging from 0.2% to 0.5%, are required for the implementation of output multiplexers in onboard radio relay equipment for satellite systems transmitting digital TV signals compliant with the DVB-T and DVB-T2 standards. Several MCR configurations are proposed in which optimization of the resonator geometry eliminates the degeneracy between high-Q and low-Q modes and provides operating regimes with an extended frequency range supporting a single TE011 mode. Capacitive resonator coupling elements allowing a wide range of coupling-coefficient variation are investigated. Based on the obtained results, the feasibility of implementing BPFs with quasi-elliptic insertion-loss characteristics and additional transmission zeros is demonstrated. Experimental investigation of a sixth-order narrowband Ku-band BPF prototype with a 34 MHz passband confirms the results of the theoretical analysis and demonstrates excellent agreement between the calculated and measured characteristics in both the frequency and time domains.
Speaker
Gerasimov Nikita Mikhailovich
Waveguide-based Systems LLC
Russia
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