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• W2555528090 abstract "In this paper, a novel compact topology of microstrip open-loop ring resonator is introduced to design narrowband bandpass fllters with better performance in making trade-ofi between insertion loss and bandwidth. The proposed structure comprises of two microstrip open- loop ring resonators only with magnetic coupling instead of electrical, magnetic and mixed ones in the conventional ones. The performance of this novel bandpass fllter is simulated using an EM simulation tool and simultaneously compared with the conventional one which conflrms the priority of this fllter to them. The proposed NB BPF provides a narrowband bandpass fllter with a bandwidth of 0.91% and better insertion and return losses in comparison with the conventional ones. Additionally, a size reduction about 36% is also reported by this novel layout. 1. INTRODUCTION Wireless personal communication services (PCS), global system for mobile communications (GSM) and satellite receiver links are some of the important applications which increasingly demand ultra narrowband (NB) fllters with a FBW of 1%{3% and sometimes less than 0.5%. These fllters should have lighter weight, less compact size, lower insertion loss and sharper selectivity in the passbands. many difierent models have been introduced to design a NB BPF with difierent topologies; however, there has always been a fundamental challenge to achieve a sort of trade-ofi between insertion loss (IL) and bandwidth (BW) in the design of such fllters so that to realize a narrower BW, insertion loss must be scarifled or vice versa. For example, dual-mode ring resonators BPF are one of the simplest kind such components by which a narrowband BPF can be designed, though their bandwidth is around 4% (1{4). In these studies, several topologies such as end-coupled as well as tapped line ones are used to enhance coupling strength between input/output and resonators have been used; however, they have not realized a narrow-band bandpass fllter with desirable narrowband and low insertion loss yet. Additionally, several compact bandpass fllters have been recently reported using microstrip open loop resonators with and without interdigital. These fllters are highly compact in size with low insertion loss; though, they have also realized a 3-dB bandwidth of around 4% (5,6). Another technique has been proposed in (7) to design narrowband BPFs using microstrip open- loop resonators with coupled and crossing Lines. This one has demonstrated a NB BPF with a bandwidth of 2% with the insertion loss of 3.1dB where dielectric overlays have been used to com- pensate this relatively high insertion loss at the expense of the increase of BW and implementation cost. This problem, a good trade-ofi between IL and BW, has reported such a critical result that the designers have utilized high-temperature superconducting thin-fllm technology to remedy conductor and dielectric losses (8{10). In this paper, a novel coupling scheme is introduced for open-loop -strip resonators by which a narrower-band BPF is designed and developed. Initially, a sample NB BPF is designed and simulated utilizing two -strip open-loop resonators realizing a 3-dB bandwidth of 0.91%. As presented, this NB BPF has a high level of insertion loss in practice. To compensate this extra loss, the topology of the proposed BPF is developed by double layout of this proposed fllter in parallel. In the wake of this modiflcation, the 3-dB BW of the fllter is sacriflced and increased up to 2.4%. The proposed NB BPF is subsequently designed and fabricated on a 50-mil-thickness RT/Duroid with dielectric constant 10.5. Furthermore, the measured and simulated results are simultaneously presented." @default.
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• W2555528090 date "2012-01-01" @default.
• W2555528090 modified "2023-09-24" @default.
• W2555528090 title "A Novel Miniaturized Narrow Band Bandpass Filter Utilizing Microstrip Open-loop Ring Resonators for Narrow-band Applications" @default.
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