Design of Bandpass Elliptic Filters Employing Inductive Windows and Dielectric Objects

• Published in: IEEE transactions on microwave theory and techniques Vol. 55; no. 11; pp. 2393 - 2398
• Main Authors: Soler, F.J.P., Martinez Fernando Mendoza, M., Pereira, F.D.Q., Rebenaque, D.C., Melcon, A.A., Cameron, R.J.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.11.2007; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Asymmetry; Band pass filters; Bandpass; Cavity resonators; Circuit properties; Couplings; Dielectric posts; Dielectrics; doublet topology; Electric, optical and optoelectronic circuits; Electronic circuits; Electronics; Exact sciences and technology; Filtering theory; Finite element methods; Frequency filters; High frequencies; inductive filters; Mathematical analysis; Microwaves; Oscillators, resonators, synthetizers; Resonator filters; Tellurium; Topology; transmission zeros; Transversal filters; waveguide filters; doublet topology; waveguide filters; transversal filters; transmission zeros; Dielectric posts; inductive filters; Compact design; Numerical method; Selectivity; Implementation; Finite element method; Elliptic filter; Band pass filter; Integral equation; Cavity resonator; High frequency; Simulator
• ISSN: 0018-9480; 1557-9670
• DOI: 10.1109/TMTT.2007.908673

In this paper, we propose an alternative configuration for the design of bandpass inductive filters using transversal topologies. The structure is based on the use of a dielectric post asymmetrically placed on a cavity resonator. The input and output windows will couple energy to the TE 102 -and TE 103 -mode resonators at the same time, therefore obtaining the transversal topology. The proposed configuration is very compact, and allows to implement transmission zeros for maximum selectivity in an easy way. Results are validated with Ansoft's finite-element High Frequency Structure Simulator tool, and with an integral-equation technique to demonstrate the validity of the proposed structure.