Band‐pass filter design using modified CSRR‐DGS |
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Authors: | M Bod AR Mallahzadeh |
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Affiliation: | Department of Electrical and Electronic Engineering, Shahed University, , Tehran, Iran |
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Abstract: | In this article, a novel compact band‐pass filter (BPF) with sharp cutoffs and a wide stop‐band is presented. The BPF is basically designed by cutting a modified complementary split‐ring resonator (CSRR) from the ground of two separated microstrip feed lines and has a 71% fractional bandwidth from 4.1 to 9 GHz. Because of the high insertion loss, the designed filter should be packed in a metallic cavity that has undesirable resonances in the stop‐band of the BPF. For eliminating cavity resonances, an evolutionary optimization technique based on changing the pixels of the CSRR defected ground structure is used. A prototype of the final structure obtained from the optimization technique is fabricated. The measurement results show that the optimized filter have a pass band from 4 to 8 GHz with a rejection better than 15 dB from 4 to 15 GHz. The designed filters have compact dimensions of 12 × 12 × 0.787 mm3. © 2014 Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:544–548, 2014. |
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Keywords: | band‐pass filter CSRR DGS sharp cutoff wide stop‐band genetic algorithm |
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