Dual Notched Band Compact UWB Band Pass Filter Using Resonator Loaded SIR for Wireless Applications
In this paper a compact and simple Ultra Wide Band (UWB) Band Pass Filter(BPF) with dual notch band is proposed. Structure of the proposed filter comprises a Stepped Impedance Resonator (SIR) loaded with Interdigital resonator. SIR is coupled with input a
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Abstract In this paper a compact and simple Ultra Wide Band (UWB) Band Pass Filter(BPF) with dual notch band is proposed. Structure of the proposed filter comprises a Stepped Impedance Resonator (SIR) loaded with Interdigital resonator. SIR is coupled with input and output ports using interdigital coupling to create UWB pass band range of the filter. Intedgital resonators are loaded on the SIR to create notch band to reject frequency in the pass band of the filter. Pass band of the filter covers 3.1 to 10.6 GHz with two notch bands at 5.2 and 7.8 GHz to avoid interfernce from the WiFi and satellite comunication. Filter is designed on Rogers RT/ Duriod 6010, with the dielectric substrate of dielectric constant εr = 10.8 and thickness h = 1.27 mm. There is no via or defected ground structure is used in the filter which makes its fabrication easier and cost effective. Keywords UWB
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BPF
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SIR
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Interdigital
1 Introduction In 2002, Federal Communication Commission (FCC), made available frequency band between 3.1 to 10.6 GHz for commercial use in wireless communication [1]. Due to this notification, the importance of filter design in the UWB range rapidly increased. Initially many filter structures based on SIR and multimode resonator were reported [2–5]. These designs were with good insertion loss and selectivity. However, in the pass band range of the filter interference of WiFi and satellite communication was big challenge for communication community. To get rid of these challenges structure of filter were reported which were able to pass UWB A.K. Pandey (✉) ⋅ R.K. Chauhan Department of Electronics and Communication Engineering, Madan Mohan Malaviya University of Technology, Gorakhpur, India e-mail: [email protected] R.K. Chauhan e-mail: [email protected] © Springer Nature Singapore Pte Ltd. 2018 S.C. Satapathy et al. (eds.), Data Engineering and Intelligent Computing, Advances in Intelligent Systems and Computing 542, DOI 10.1007/978-981-10-3223-3_30
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range frequency with notch at different interfering signals [6–9]. However, all reported structures suffer from poor insertion loss, poor selectivity and with wide rejection at interfering signals. In this paper a simple, planar and compact structure of filter proposed which shows good insertion loss, sharp notch and interfering signals without via and defected ground structure in the structure. This filter is composed of SIR loaded with interdigital resonator. Different notch frequencies can be tuned by changing resonator length. Proposed filter is designed to pass UWB frequency between 3.1 to 10.6 GHz with notch at 5.2 and 7.8 GHz.
2 Design of Proposed Filter The structure of proposed filter comprises of SIR based Multimode Mode Resonator (MMR) loaded with interdigital resonators as shown in the Fig. 1. To create a UWB pass band range a well-known MMR structure of SIR is designed for the centre frequency of 6.85 GHz. SIR structure is made up of a half-wavelength line (L1 = λg/2) of low impedance (Width, W1) in the centre and
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