Compact microstrip lowpass filter using meandered unequal T-shaped resonator with ultra-wide rejection band |
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| Affiliation: | 1. Department of Electrical Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran;2. Faculty of Engineering, Electrical Engineering Department, Razi University, Kermanshah, Iran;3. Young Researchers and Elite Club, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran;1. Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, SB RAS, Novosibirsk 630090, Russia;2. Functional Electronics Laboratory, Tomsk State University, Tomsk 634050, Russia;3. Laboratory of Single Crystal Growth, South Ural State University, Chelyabinsk 454080, Russia;4. Radio-Received and Radio-Transmitted Devices Department, Novosibirsk State Technical University, Novosibirsk 630073, Russia;5. Department of Electronic Devices, Novosibirsk State Technical University, Novosibirsk 630073, Russia;6. General Physics Department, Novosibirsk State Technical University, Novosibirsk 630073, Russia;1. Dept. of Electronics and Communication Engg, Institute of Engineering and Management (IEM), Gurukul Campus, Sector V, Kolkata, WB 700 091, India;2. Department of Electronics and Tele-Communication Engineering, Jadavpur University, Kolkata 700 032, India;1. Facultad de Matemáticas, Universidad Autónoma de Guerrero, Av. Lázaro Cárdenas S/N, Cd. Universitaria, Chilpancingo, Guerrero, Mexico;2. CONACyT-Tecnológico Nacional de México/CENIDET, Interior Internado Palmira S/N, Col. Palmira, C.P. 62490, Cuernavaca, Morelos, Mexico;1. Qingdao University, School of Electronic and Information Engineering, Ningxia Road, Qingdao 266071, China;2. Southeast University, School of Information Science and Engineering, 2 Sipailou, Nanjing 210096, China;3. Shanghai Dianji University, School of Electronic Information, Olive Road, Shanghai 200240, China |
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| Abstract: | In this paper, a compact lowpass filter (LPF) with ultra-wide rejection band has been presented. In fact, a novel meandered semi-hairpin resonator has been used and the stopband characteristics have been improved by using a combinatorial suppressing unit. The suppressing unit contains a combination between T-shaped and semi-circular patches, which are loaded symmetrically to the designed resonator. For the proposed LPF, the-3 dB cut-off frequency has been adjusted to 2.2 GHz. After simulations, the proposed LPF has been fabricated and tested. The experimental results validated that the rejection bandwidth is expanded from 2.471 GHz to 28.62 GHz with corresponding attenuation level of ?20 dB. The transition band is only 0.271 GHz from 2.2 GHz to 2.471 GHz with corresponding attenuation levels of ?3 dB to ?20 dB, respectively. In addition, the measured maximum insertion loss and return loss in the passband, from DC to 2.04 GHz (93% of the passband region) are 0.2 dB and 17 dB, respectively. |
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| Keywords: | Lowpass filter Microstrip Resonator Suppressing unit Ultra-wide rejection band |
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