Design of compact extended-stopband microstrip low-pass filters by employing new mutual- coupling technique for defected ground structures (DGSs)

Boutejdar, A.; Makkey, Mostafa Y.; Elsherbini, A.; Luxor, O.; Omar, A.S.

doi:10.1109/eumc.2007.4405128

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…An equivalent circuit of parallel LC circuit corresponds to this bandgap effect can be used in filter design. Various shapes of DGS have been investigated in [1][2][3][4][5][6][7][8][9][10][11]. At [9], the authors used double equilateral U-shaped DGS unit that offers a dualfinite-attenuation-pole characteristic with cutoff frequency of 2.3 GHz and the stopband extend to 10 GHz.…”

Section: Introductionmentioning

confidence: 99%

Compact Lowpass Filter With Sharp Transition Band Based on Defected Ground Structures

Mohra¹

2009

PIER Letters

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Abstract-A lowpass filter with a very sharp transition band using defected ground structures (DGS) is described. The lowpass filter was designed by using three dumbbell slots at the ground plane. Two of those dumbbell slots are the reshaped rectangular and the third dumbbell slot is an inverted triangle. The lowpass filter designed at cutoff frequency of 3.0 GHz, which is suitable for GSM900, GSM1800 and UMTS applications of the mobile communications. The equivalent circuits for the proposed lowpass filter and its corresponding LC parameters are given. The proposed lowpass filter provides a size of 33 × 30 mm 2 , and have good transition band with good performance in the passband and have wide rejection up to 9.25 GHz plus harmonic suppression in the stopband.Measurements results show good agreements with the simulated results.

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