A wide-band bandpass filter using the properties of microstrip open-loop resonator with spurious response suppression

2008 ◽  
Author(s):  
J. Konpang
Keyword(s):  
Bandpass Filter ◽  
Wide Band ◽  
Open Loop ◽  
Response Suppression ◽  
Spurious Response

scholarly journals A Compact Tri-Band Bandpass Filter with High Out-of-Band Rejection

2017 ◽  
Vol 7 (4) ◽  
pp. 1786-1790
Author(s):  
M. Abdul-Niby ◽  
M. Farhat ◽  
M. Nahas ◽  
Μ. Μ. Alomari
Keyword(s):  
Degrees Of Freedom ◽  
Bandpass Filter ◽  
Wide Band ◽  
Open Loop ◽  
Dual Band ◽  
Center Frequency ◽  
Transmission Zeros ◽  
Harmonic Rejection ◽  
Band Filter ◽  
Loop Ring

This paper presents a planar tri-band bandpass filter with high out-of-band rejection over a wide band. The filter is based on two pairs of λ/4 resonators embedded inside an open loop ring resonator without any size increase, where each pair of resonators are electromagnetically coupled to each other and the feedlines. This results in the excitations of passbands, where the first passband is generated by the open loop resonators. The second and the third passbands are excited by λ/4 resonators. The proposed technique provides sufficient degrees of freedom to control the center frequency and bandwidth of the three passbands independently. In addition, the six transmission zeros created around the passbands results in a tri-band filter with high selectivity, sharp 3 dB cut-off frequency, high isolation, low passband insertion-loss and high out-of-band harmonic rejection across an ultra-broadband frequency range up to 17 GHz. The proposed technique has the ability to switch from triple to dual band by removing one pair of the inner resonators. Design methodology and simulation results of the filter are provided.

DESIGN AND REALIZATION OF THREE-POLE BANDPASS FILTER WITH SPURIOUS RESPONSE SUPPRESSION USING DEFECTED GROUND STRUCTURES

2013 ◽  
Vol 45 ◽  
pp. 87-100
Author(s):  
Alia Zakriti ◽  
Naima Amar Touhami ◽  
Khadija Bargach ◽  
Mohammed Lamsalli ◽  
Mohammad Essaaidi
Keyword(s):  
Bandpass Filter ◽  
Response Suppression ◽  
Defected Ground Structures ◽  
Ground Structures ◽  
Spurious Response
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