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Coplanar quarter-wavelength quasi-elliptic filters without bond-wire bridges

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3 Author(s)
Jiafeng Zhou ; Dept. of Electron., Electr., & Comput. Eng., Univ. of Birmingham, UK ; Lancaster, M.J. ; Huang, F.

This paper presents the design and experimental results of two coplanar quarter-wavelength microwave filters operating at a frequency of approximately 3 GHz. Coplanar designs are of particular interest because they are less sensitive to the thickness of the dielectric substrate than other transmission-line types such as a microstrip. One of the designs has a quasi-elliptic frequency response. In addition, the design also eliminates problems with unbalancing of the ground planes normally present in coplanar structures. Bond wires between the ground planes are not required. This paper describes in detail the structure of the resonators and how they are coupled together to form a filter.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:52 ,  Issue: 4 )