Design of a compact dual‐band folded‐waveguide bandpass filter using multilayer waveguide resonators |
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| Authors: | Sultan Almorqi Hussein Shaman Jia‐Sheng Hong Osama M. Haraz |
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| Affiliation: | 1. National Centre for Sensors and Defense Systems Technologies (NCSDST), King Abdulaziz City for Science and Technology (KACST), Riyadh, Saudi Arabia;2. School of Engineering & Physical Sciences;3. Sensors, Signals & Systems, Heriot‐Watt University, Edinburgh, United Kingdom;4. KACST Technology Innovation Center in Radiofrequency and Photonics for the e‐Society (RFTONICS), King Saud University, Riyadh, Saudi Arabia;5. Electrical Engineering Department, Faculty of Engineering, Assiut University, Assiut, Egypt |
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| Abstract: | A novel compact dual‐band bandpass filter based on multilayer folded‐waveguide (FWG) structure is presented in this article.In this design, slots are used to realize direct coupling between adjacent resonators and apertures are adopted to implement cross coupling between non‐adjacent resonators.A new technique of external quality factor of FWG resonator and coupling coefficients between different resonators are studied using full‐wave simulator. In order to demonstrate the proposed technique, a four‐pole dual‐band bandpass filter is designed, fabricated and measured using vector network analyzer. Measurement results which are well agreed with simulation results are presented. Moreover, four‐pole substrate integrated folded waveguide SIFW dual‐band bandpass filter, using two layers of slotted folded waveguide resonators, is demonstrated. The proposed filter has a compact size and it is excellent candidate for the application of wireless communication systems. © 2015 Wiley Periodicals, Inc. Int J RF and Microwave CAE 25:780–788, 2015. |
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| Keywords: | folded‐waveguide resonators microwave filters dual passband filter SIFW |
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