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First spurious suppression in microstrip parallel-coupled line filters using compensated capacitors and stubs

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2 Author(s)
Moradian, M. ; Mahdi Moradian Dept. of Electr. Eng., Iran Univ. of Sci. & Technol., Tehran ; Khalaj-Amirhosseini, M.

In this paper a suitable method is presented which allows it to effectively remove the first spurious pass-bands. The proposed filter configuration is constructed by adding three appropriate capacitors between each coupled line and three attached open-circuit stubs at each line of the conventional coupled-line filter. The capacitors and stubs are placed at the middle and each end of the coupled-lines. Placing the capacitors lead to equal modal phase velocities and shorten coupled-line lengths. In order to demonstrate the characteristics of the proposed filter, a third order band-pass filter centered at the operating frequency 1 GHz with 20% fractional bandwidth is designed and simulated. The simulated results show for such a filter prototype, the first spurious response is effectively suppressed.

Published in:

Information and Communication Technologies: From Theory to Applications, 2008. ICTTA 2008. 3rd International Conference on

Date of Conference:

7-11 April 2008

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