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Transformation of the Coplanar Waveguide Bandpass Filter to Band Stop Filter by Serpentine Shape Shunt/Open Stubs

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Abstract

In this paper, the design and simulation of a new compact bandpass filter (BPF) has been implemented with serpentine meandershunt stub on coplanar waveguide technology. The inductive loading is improved by serpentine meander, thus the size of the BPF is reduced. The size of the proposed BPF structure is 4 × 2.6 mm2. The behaviour of the proposed structure and effects on the frequency response of BPF while changing the dimensions is carried out with an electromagnetic (EM) simulator. The equivalent circuit model describes the proposed BPF and exhibits the center frequency, bandwidth, and insertion loss of 20, 8 GHz, and< 0.1 dB respectively. The device-level and equivalent lumped model simulations are done by using the HFSS and ADStools. The proposed BPF is transformed into the bandstop filter, while the serpentine shunt type meander is convertedinto an open stuband also the coupling capacitance gap has vanished. The frequency response of bandstop filter (BSF) is also carried out with both EM and equivalent simulations, these simulations are disclosed the excellent agreement between the electromagnetic (EM) and lumped equivalent model simulations for both BPF and BSF over a frequency range of (15–30) GHz. Hence the proposed structure is recommended for K band (18–26) GHz applications.

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Acknowledgements

The authors would like to thank NMDC supported by NPMASS, National Institute of Technology, Silchar for providing the necessary computational tools.

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  1. MEMS Research Center, Department of ECE, Koneru Lakshmaiah Educational Foundation (Deemed to Be University), Guntur, Andhra Pradesh, 522502, India

    Sk. Shoukat Vali & K. Srinivasa Rao

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  1. Sk. Shoukat Vali
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  2. K. Srinivasa Rao
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Correspondence to K. Srinivasa Rao.

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Vali, S.S., Rao, K.S. Transformation of the Coplanar Waveguide Bandpass Filter to Band Stop Filter by Serpentine Shape Shunt/Open Stubs. Trans. Electr. Electron. Mater. 23, 642–649 (2022). https://doi.org/10.1007/s42341-022-00403-x

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