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In this paper initially a parallel filter with centre frequency 2.4 GHz and fr 20%, has been designed and simulated. H rejection performance of this parallel coup improved by using a proposed "Coupled C Resonator Structure". Using this propo additional transmission zero or attenuation p the harmonic passband region extending fr improving the out-band rejection of the f designed on FR4 substrate having relative p substrate height 1.59 mm using IE3D full wa simulator. Keywords-Microstrip, parallel coupled ban coupled closed loop square resonator, FR4 sub

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