Sharp Skirt Dual-Mode Bandpass Filter with Overlay Plate to Control Upper Passband Edge
Shobha Hugar1, Vaishali B M2, J S Baligar3

1Shobha Hugar*,Electronics and Communication Engineering, Sapthagiri College Of Engineering, Bangalore, India.
2Vaishali B M, Visvesvaraya Technological University, Belagavi, India.
3J S Baligar, Electronics and Communication Engineering, Dr Ambedkar Institute Of Technology, Bangalore, India.
Manuscript received on July 20, 2019. | Revised Manuscript received on August 10, 2019. | Manuscript published on August 30, 2019. | PP: 2357-2360 | Volume-8 Issue-6, August 2019. | Retrieval Number: F8648088619/2019©BEIESP | DOI: 10.35940/ijeat.F8648.088619
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Abstract: This paper presents design and analytical model for Sharp Skirt Dual-Mode Bandpass Filter for RF receivers. Proposed filter is designed using open stub loaded H shaped resonator. Based on analytical model insertion loss S21 and return loss S11 for proposed filter are demonstrated. Inductive Overlaying plate is proposed to control upper passband edge of proposed filter to improve frequency selectivity with fixed center frequency. The proposed filter has sharp frequency selective range from 5.1GHz to 9.2GHz. With overlay plate, frequency selective range is tuned to 5.1GHz-8.6GHz. Without overlaying plate the proposed filter has return loss greater than 10dB and insertion loss of 0.7dB. Lower and upper passband edges are at 5.1GHz and 9.2GHz with attenuation level of 52dB and 54dB respectively. With overlaying plate, the filter has same S 11 and S 21 parameters, but upper passband edge is shifted from 9.2GHz to 8.6GHz.
Keywords: Dual-Mode, Over lay plate, Passband edge, Printed Circuit Board Technology