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Sharp-Rejection, Wide and Deep Stopband Low Pass Filter Design Using Open Stubs and DGS Patterns

100%
Challal M., Boulakroune M.
Acta Physica Polonica A
|
2016
|
vol. 130
|
issue 1
9-10
EN
A sharp rejection, wide and deep stopband microstrip low pass filter is investigated in this paper. The proposed low pass filter is composed of three defected ground structure patterns and four open stubs. Simulated results verify that the filter has a sharpness factor of 0.9, a low insertion loss of 0.65 and a return loss less than 15 dB. Moreover, a wide stopband at 20 dB rejection ranging from 4.55 GHz to 11.62 GHz is accomplished. The filter presented in this work was compared with the previous works completed on low pass filter with sharp rejection. It has shown that the filter provides good performances in terms of sharp rejection, wide and deep rejection band and small passband insertion loss compared to those reported in the literatures.
2
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Wide Stopband Microstrip Bandpass Filter Based on a Compact Slotted Ground Structure

71%
Challal M., Dehmas M., Azrar A., Aksas R., Trabelsi M.
Acta Physica Polonica A
|
2015
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vol. 128
|
issue 2B
B-71-B-72
EN
A new concept for implementing a bandpass filter by employing a discontinuity in the feed microstrip line in the upper layer and modified dumbbell-shaped slots etched in the ground plane is proposed. The effect of the slot area on the bandpass filter performance is examined. The proposed bandpass filter showed wide stopband and low insertion loss. To further verify the new concept, the structure is implemented and the measurement results are found to be in good agreement with the simulation ones. The proposed structure can be used in various microwave circuits.
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