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2019-06-23

Design and Development of Recessed Ground Microstrip Line Low Pass Filters

Anushruti Jaiswal,

Mrs. Anushruti Jaiswal

Indian Institute of Technology Delhi

India

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Mahesh Pandurang Abegaonkar,

Prof. Mahesh Pandurang Abegaonkar

Centre for Applied Research in Electronics

Indian Institute of Technology Delhi

India

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Shiban Kishen Koul

Dr. Shiban Kishen Koul

Indian Institute of Technology Delhi

India

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Progress In Electromagnetics Research Letters, Vol. 85, 91-99, 2019

doi:10.2528/PIERL19040304

Abstract

The design of conventional stepped-impedance microstrip line low pass filter (LPF) is based on high (Z_H) to low impedance (Z_L) ratio. The width of Z_H line, for Z_H > 100 Ω, becomes critical and challenging, especially on high dielectric constant substrates. A concept of air-filled recessed ground plane below a microstrip line is introduced in this paper. The effect of dimensions of recessed ground on characteristic impedance, attenuation and propagation constant of a microstrip line are first studied. This simple approach is utilized to design the Z_H line of stepped-impedance microstrip line LPFs. Prototypes of recessed ground stepped-impedance microstrip line LPFs with Z_H/Z_L (keeping Z_L constant as 20 Ω)ratio in the range 6 to 10 are designed and developed on Rogers 4350B of height 0.508 mm with ε_r = 3.66 at 3 GHz. For LPF with Z_H/Z_L = 10, the measured 3-dB cutoff frequency (f_c) is achieved at 3.12 GHz with return loss (RL) > 12 dB and insertion loss (IL) < 0.28 dB in its passband whereas the stopband attenuation (SBA) is better than 38 dB. In comparison to recessed ground LPF, the simulated results of conventional LPF with Z_H/Z_L = 10 (critical width of Z_H line =) are as follows RL > 10 dB and IL < 1.07 dB in passband at f_c = 3 GHz. The size of recessed ground LPF is reduced by 25%, when Z_H/Z_L is increased to 10 from 6. The approach of recessed ground microstrip line avoids the fabrication issues, reduces size, and improves the performance of LPF, which in turns confirms the advantages of recessed ground over conventional microstrip line.

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Anushruti Jaiswal, Mahesh Pandurang Abegaonkar, and Shiban Kishen Koul, "Design and Development of Recessed Ground Microstrip Line Low Pass Filters," Progress In Electromagnetics Research Letters, Vol. 85, 91-99, 2019.
doi:10.2528/PIERL19040304

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