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Session: TH1A8:00 AM Thursday, June 19, 2008 Room: A311 |
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Session: TH1A | Filter Theory and New Concepts |
Chair: | Giuseppe Macchiarella, Politecnico di Milano |
Co-Chair: | Huiwen Yao, Orbital Sciences Corp. |
Abstract: | This session presents the recent development of filter theory and new design concepts. It attempts to take the advantage of losses and multiple passes to enhence filter characteristics. |
| | TH1A-01 | Novel Waveguide Pseudo-Elliptic Filters using Slant Ridge Resonators | 1433 | S. Bastioli1, L. Marcaccioli2, R. Sorrentino1, 1University of Perugia, Perugia, Italy, 2RF Microtech s.r.l., Perugia, Italy |
| This paper presents a novel resonant structure for the design of compact pseudo-elliptic filters in waveguide technology. The resonator consists of a rectangular ridge which is arbitrarily located and oriented within a rectangular waveguide. Under certain conditions, by exciting the ridge with the fundamental TE10 mode, the resonator exhibits a transmission zero besides the transmission pole, thus behaving as a singlet. This element can be used as a basic building block for the design of higher order filters. In this work an in-line 5th order filter with three asymmetrically placed transmission zeros has been fabricated and tested, demonstrating the feasibility of the proposed design. | | |
TH1A-02 | Design of Coaxial Resonator Filter with Nonuniform Dissipation | 1425 | Z. Zakaria, I. C. Hunter, A. C. Guyette, Institute of Microwaves and Photonics, Leeds, United Kingdom |
| This paper presents a novel design of narrow bandpass filter based on a new filter synthesis technique which allows for the realization of lossy filters with ideal lossless transmission and reflection response, offset by a constant amount. An experimental three-pole Chebyshev filter having 6 dB insertion loss and return loss better than 26 dB in the passband is demonstrated. This new class of filter would be useful in microwave systems where the increased insertion loss can be tolerated, such as in a satellite IMUX. | | |
TH1A-03 | Generalized Lossy Microwave Filter Coupling Matrix Synthesis and Design | 1524 | V. Miraftab, M. Yu, COM DEV Ltd., Cambridge, Canada |
| This paper introduces a systematic analytical technique to synthesize lossy reciprocal and non-symmetrical microwave filters. The procedure handles multiple complex couplings among resonators and finite-Q resonators. Elliptic and Chebyshev 4-pole examples are included. The 4-pole Chebyshev example has been designed and fabricated using Combline technologies. | | |
TH1A-04 | Longitudinal Dual-Mode Filters in Rectangular Waveguide | 1467 | J. A. Ruiz-Cruz1, Y. Zhang2, J. R. Montejo-Garai3, J. M. Rebollar3, K. A. Zaki4, 1Universidad Autonoma de Madrid, Madrid, Spain, 2Radio Frequency Systems, Meriden, United States, 3Universidad Politecnica de Madrid, Madrid, Spain, 4University of Maryland, College Park, United States |
| Dual-Mode filters are used in applications where low mass and volume are required. In this paper, the Computer Aided Design of a new rectangular waveguide filter structure is proposed for achieving the dual-mode operation. It preserves the longitudinal inline topology used in the classical circular waveguide configuration, which can provide quasi-elliptic function responses. However, it has no coupling or tuning screws and it is exclusively made up of sections of aligned rectangular waveguides. This leads to a very efficient full-wave analysis based on the Mode-Matching method. The proposed CAD is illustrated with a four order prototype, whose results are compared with other numerical technique. | | |
TH1A-05 | Enhanced Topology for the Design of Bandpass Elliptic Filters Employing Inductive Windows and Dielectric Objects | 1401 | M. Martinez-Mendoza1, J. Perez-Soler1, S. Gomez-Diaz1, F. Quesada-Pereira1, A. Alvarez-Melcon1, R. Cameron2, 1Technical University Cartagena, Cartagena, Spain, 2COM DEV Europe Ltd, Aylesbury, United Kingdom |
| This work presents a new topology for the design of bandpass elliptic filters employing inductive windows and dielectric objects. The proposed filtering structure combines, for the first time, the modified TE102 resonating mode with the modified TE201 mode. The TE201 mode is excited for the first time by placing a wide dielectric post inside a waveguide cavity. The main advantage of the new topology over existing ones, is that two transmission zeros can be synthesized in the insertion loss response of the filter, for a second order structure. Also there is a high flexibility on the location of the transmission zeros. They can be synthesized along the frequency axis for maximum selectivity, or as a pair of complex poles for phase equalization. | | |
TH1A-06 | A Novel Low-loss Integrated 60 GHz Cavity Filter with Source-Load Coupling using Surface Micromachining Technology | 1307 | B. Pan, Y. Li, M. Tentzeris, J. Papapolymerou, GEDC, Georgia Tech, Atlanta, United States |
| Abstract—This paper presents a novel surface micromachined low-loss integrated cavity filter with a pair of transmission zeros using a simple source-load coupling scheme for emerging 60 GHz applications. The proposed method eliminates the dielectric loss by elevating the cavity-based filter into the air with the aid of the polymer-core conductor surface micromachining technology. The electrical fields of the cavity are thus entirely in air. A coplanar waveguide input and output interface is designed for easy integration with other planar electronics. The inter-cavity inductive coupling is realized through the use of pillar array iris, with the source-load capacitive coupling achieved with integrated coplanar waveguide lines. This combination of couplings creates a pair of transmission zeros to help achieve better selectivity. A measured insertion losses as low as 1.92 dB, along with a pair of transmission zeros, has been observed at 60 GHz. | | |
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