Design of a tunable wideband bandpass filter based on substrate integrated waveguide technology for channelized receivers

Date

2024-9-5

Author

İşcan, Ecenaz

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In this thesis, a compact-size wideband bandpass filter (BPF) design that can operate in the S/C Band is presented. High out-of-band rejection, low insertion loss, and high return loss are other advantageous features achieved. The proposed BPF is suitable for use in satellite communication, channelized receivers, front-end units, measurement, and test devices. A hybrid approach combining lumped capacitors and the substrate-integrated waveguide technique is chosen to create the BPF. The goal is to decrease the size of BPF while improving its ability to shield it from the outside. The initial stage is constructing the fundamental resonator. A thorough analysis is conducted for the parameters influencing the resonator performance. After that, analytical and computational approaches are used to investigate the dual coupling. Then, a fourth-order BPF design is developed. Moreover, the optimality of the filter is verified using particle swarm optimization. Following that, an electrically tunable version of the filter is enhanced using varactor diodes. The lower and upper cutoff frequencies can be modified separately by employing two distinct voltages transmitted via wire bonds. This layout modification results in a minimal enlargement of the filter and negligible power consumption. Circuit representations of the BPFs and their correlation with simulations are also investigated to aid and expedite the design process. Finally, ground capacitors are converted into a distributed form for finely tuned capacitance values. Using an iterative grid search process, the ideal parallel plate dimensions for the widest band are determined. All designed BPFs are manufactured and tested.

Subject Keywords

Substrate integrated waveguide, Bandpass filters, Tunable, Channelized receiver

URI

https://hdl.handle.net/11511/111561

Collections

Graduate School of Natural and Applied Sciences, Thesis