Microstrip bandpass filters using coupled feed lines for third and fourth generation communications |
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| Affiliation: | 1. Young Researchers and Elite Club, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran;2. Department of Electrical Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran;1. RCC Institute of Information Technology, Kolkata, India;2. Institute of Radio Physics and Electronics, University of Calcutta, Kolkata, India;1. Department of Electrical Engineering, Kermanshah University of Technology, Kermanshah, Iran;2. Young Researchers and Elite Club, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran;1. Department of Communication and Computer Engineering, Cihan University-Erbil, Iraq;2. Department of Software Engineering, Faculty of Engineering, Koya University, Koya KOY45, Iraq;3. Department of Electrical Engineering, Kermanshah University of Technology, Kermanshah, Iran;4. Institute of Research and Development, Duy Tan University, Da Nang 550000, Viet Nam;5. Faculty of Electrical – Electronic Engineering, Duy Tan University, Da Nang 550000, Viet Nam;1. Shenzhen Research Institute of Xiamen University, Shenzhen 518057, China;2. Department of Electronic Science, Xiamen University, Xiamen 361005, China;3. Department of Electronic Engineering, City University of Hong Kong, Hong Kong;4. Department of Electrical and Computer Engineering, Duke University, Durham, NC 27708, USA |
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| Abstract: | In this paper, two compact tuneable bandpass filters (BPFs) based on the coupled feed lines are introduced. To approach a compact size, the coupled feed lines are bended. To design a high performance single-band bandpass filter (BPF), coupled feed lines are loaded by T-shaped stubs (as main resonators) and rectangular stubs (as suppressor stubs). Also, the mechanism of coupled feed lines combining with T-shaped open stubs is analyzed to show a tunable passband. The dual-band BPF includes two big radial-stubs, two small radial-stubs, two T-shaped structures and spiral coupled feed lines. The LC model of big radial-stubs is analyzed to compute the equation of transmission zero using its transfer function. The passband frequency of single-band BPF resonates at 2.12 GHz (3G) with corresponded insertion loss of 0.83 dB. Also, for dual-band BPF, the measured insertion-losses of first and second passbands are close to 0.8 and 1.1 dB, respectively. The frequency responses of BPFs are easily adjusted by altering the physical dimensions, demonstrating a adjustable performance. To verify the correct operation of circuits, the proffered filters are implemented and tested. |
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| Keywords: | Bandpass filters Dual-band Radial-stub Single-band T-shaped Tuneable |
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