Design and implementation of a Ku-band cross-coupled gap waveguide filter using non-resonating negative coupling node

作者：Arezoomand Masoud; Pirhadi Abbas^*; Karimian Shokrollah

来源：IET Microwaves Antennas & Propagation, 2018, 12(8): 1345-1351.

DOI：10.1049/iet-map.2017.1055

• waveguide filters
• matrix algebra
• microwave filters
• resonators
• Ku-band cross-coupled gap waveguide filter
• nonresonating negative coupling node
• advanced filter design techniques
• coupling matrix
• GW structures
• GW resonators

In this study, the design of Ku-band cross-coupled filter based on gap waveguide (GW) technology is presented. The proposed cross-coupled filter is designed and implemented based on advanced filter design techniques, by incorporating two transmission zeros in the vicinity of its passband. In doing so, the appropriate filter order and its topology is first identified. The associated coupling matrix is then obtained. Towards achieving the main goal of this work, the proposed cross-coupled filter is then implemented based on GW structures. This included the design of resonators, the coupling between resonators and coupling of input and output ports. The extracted coupling matrix contains negative elements, which represent the negative coupling between resonators. The main challenge here is to realise the negative coupling between GW resonators. The newly proposed configuration, named suspended ridge GW, which operates as a non-resonating node in the operating frequency of the filter is used to realise the negative coupling effect. Simulation and measurement results of the filter confirm the validity of the proposed technique in the design of the cross-coupled filter, and creating the desired transmission zeros in the vicinity of its passband.

• 出版日期2018-7-4