Compact circular-patch-based bandpass filter for ultra-wideband wireless communication systems |
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| Affiliation: | 1. Department of Electrical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran;2. Department of Electrical Engineering, Sadjad University of Technology, Mashhad, Iran;1. Department of Electrical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran;2. Department of Electrical Engineering, Sadjad University of Technology, Mashhad, Iran;1. Department of Nephrology, The Affiliated Hospital of Qingdao University, Qingdao 266003, Shandong, China;2. National Institute of Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention, Beijing 100050, China;3. Department of Nephrology, The Second Hospital of Shandong University, Jinan 250100, Shandong, China;1. EHF Key Lab of Science, University of Electronic Science and Technology of China (UESTC), Chengdu 611731, China;2. Institute of Electromagnetics and Acoustics & Department of Electronic Science, Xiamen University, Xiamen 361005, China;3. Shenzhen Research Institute of Xiamen University, Shenzhen 518057, China;4. Department of Electrical and Computer Engineering, Duke University, Durham, NC 27708, USA |
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| Abstract: | Ultra-wideband (UWB) is a radio technology that enables low-power-level, short-range, and wide-bandwidth communication, and it has been widely applied in personal area networks, precision geolocation, medical, surveillance, and vehicular radar systems. Since Federal Communications Commission released the unlicensed use of the UWB range (3.1–10.6 GHz), a significant attention has been paid to the development of UWB devices, particularly UWB bandpass filters. In this paper, we propose a novel UWB bandpass filter based on circular patch resonator that is grounded by via and perturbed by slits and defected ground structures. The resonator’s behaviour is analysed in detail and it is shown that its specific configuration allows a flexible control of the three lowest resonant modes, which are used to form UWB passband. To demonstrate the potential of the resonator, a UWB filter has been designed, fabricated, and measured. The filter is characterized by the insertion loss lower than 1 dB and return loss higher than 17 dB within the passband, as well as by very small group delay variation of only 0.07 ns. Also, the filter exhibits suppression higher than 19 dB up to 30 GHz, and very small overall dimensions of only 0.31λg × 0.31λg, and thus it outperforms other published UWB filters. |
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| Keywords: | Ultra-wideband Patch resonator Bandpass filter Defected ground structure |
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