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PIER PIER B PIER C PIER M PIER Letters
2011-03-22
Coaxial Narrowband Filters Using a Versatile Suspended Resonator
By
Aline Jaimes-Vera,

    Dr. Aline Jaimes-Vera

    Signal Theory and Communications Department

    Technical University of Catalonia

    Spain

    Homepage

Ignacio Llamas-Garro,

    Dr. Ignacio Llamas-Garro

    Centre Tecnològic de Telecomunicacions de Catalunya (CTTC/CERCA)

    Spain

    Homepage

Alonso Corona-Chavez

    Dr. Alonso Corona-Chavez

    INAOE

    Mexico

    Homepage

Progress In Electromagnetics Research, Vol. 115, 79-94, 2011
doi:10.2528/PIER11020402
Abstract
In this paper two four-pole filters at X-band are presented, both designs use a coaxial quarter wavelength resonator suspended in air by short circuits between the coaxial center and outer conductor. Different couplings between suspended resonators have been used to obtain a Chebyshev and a quasi-elliptic response. The Chebyshev filter was designed to have a 9.2 GHz centre frequency with a 4% fractional bandwidth. The second design is a quasi-elliptic filter composed of two vertically stacked rectangular coaxial lines, where one pair of resonators is placed on the lower coaxial line and another pair is located on the upper line. Coupling between coaxial lines is achieved through an iris in the common coaxial ground plane. The quasi-elliptic filter has been designed to have a centre frequency of 9.1 GHz with a 4% fractional bandwidth. Two transmission zeros located at the sides of the passband have been successfully achieved with the proposed filter topology. Experimental results for both designs are presented, where a good agreement with simulations has been obtained.
Citation
Aline Jaimes-Vera, Ignacio Llamas-Garro, and Alonso Corona-Chavez, "Coaxial Narrowband Filters Using a Versatile Suspended Resonator," Progress In Electromagnetics Research, Vol. 115, 79-94, 2011.
doi:10.2528/PIER11020402
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