IEEE MTT-S 2008 International Microwave Symposium Technical Program

Session: TH2A	Filter Realization Techniques
Chair:	Ming Yu, COM DEV
Co-Chair:	Vicente E. Boria, Tech. University of Valencia
Abstract:	This session presents the recent development of filter realization techniques. It attempts to minimize filter volume and introduce new fabrication techniques.

TH2A-01	New Concepts for Dielectric Multi-Mode Resonators with Branches
1219	M. Hoeft, Panasonic Electronic Devices Europe GmbH, Lueneburg, Germany
	In this paper new concepts for multi-mode resonators are presented, which are based on TM-mode operation in dielectric rods. By proper arrangement of dielectric rods in branch configuration, new fundamental eigenmode resonances could be shown to be present. In the simplest case, dual-mode operation could be achieved by an Y-shape arrangement. Higher number of fundamental modes could be obtained by adding further branches to the novel mono-block ceramic, which is suitable for planar fabrication. Furthermore, non-planar constructions are advantageously possible as shown exemplarily at a manufactured filter prototype.

TH2A-02	Multilayer Folded-Waveguide Dual-Band Filter.
1102	S. K. ALotaibi, J. Hong, Z. Hao, Heriot-Watt University , Edinburgh, United Kingdom
	This paper presents a primary investigation into developing a compact dual passband filter using novel folded-waveguide resonators with a multilayer structure. A new coupling scheme for dual-band operation is realized. Both slot and aperture couplings are used for the implementation. For the demonstration, a 4-pole dual-band filter of this type has been designed, fabricated and tested. Simulations and experimental results are presented to validate the design and to show the advantages of this type of filter.

TH2A-03	Theoretical investigation of microwave breakdown ignition in OMUX filters. A 3D numerical modeling approach
1515	K. Frigui¹, D. Baillargeat¹, S. Verdeyme¹, S. Bila¹, A. Catherinot², J. Puech³, D. Pacaud⁴, J. Herren⁴, ¹XLIM, Limoges, France, ²SPCTS, Limoges, France, ³CNES, Toulouse, France, ⁴Thalas Alenia Space, Toulouse, France
	A description of microwave breakdown in output multiplexer filter is presented in this paper. Such a phenomenon can affect the device and cause irreversible damage. It is so necessary to be able to predict the power level which can generate such a microwave breakdown. To study this problem, a multidisciplinary approach with a combination of three fields of science was used: electromagnetic, thermal transfer theory and plasma physics. In this paper new 1D and 3D numerical investigations of microwave breakdown in OMUX filters are presented.

TH2A-04	Sequential Tuning of Coupled Resonator Filters Using Hilbert Transform Derived Relative Group Delay
1597	N. Zahirovic, R. R. Mansour, University of Waterloo, Waterloo, Canada
	A sequential tuning technique for coupled resonator filters using the Hilbert transform derived relative group delay is demonstrated. It is shown that the S21 group delay contains sufficient information for filter tuning and that this group delay can be derived from the magnitude of S21 using the Hilbert transform. This technique allows for the cost of the required tuning hardware to be decreased by an order of magnitude compared to a complete VNA setup. Measured results for the tuning technique using a 3-pole 3% bandwidth filter at 14GHz are shown with an achieved return loss of 13dB demonstrating the usefulness of the technique for coarse filter tuning.

TH2A-05	Innovative Manufacturing Technology for RF Passive Devices Combining Electroforming and CFRP Application
1259	S. Liberatoscioli¹, M. Mattes², M. Guglielmi³, D. Schmitt³, C. Ernst³, ¹APCO, Vevey, Switzerland, ²EPFL, Lausanne, Switzerland, ³Esa Estec, Noordwijk, Netherlands
	In this paper an innovative manufacturing technology is presented that combines electroforming and CFRP (Carbon Fiber Reinforced Plastic) application and thus could be an enabling technology to achieve tuningless lightweight RF passive hardware with complex geometries. In order to demonstrate the performances achievable with this manufacturing process, a highly sensitive 0.14% fractional bandwidth dual mode filter centered at 19.8GHz was fabricated and tested. The flange interface of the filter was an integral part of the hardware and the total weight four times lighter than an equivalent part made from INVAR.

TH2A-06	Size-Reduced Tunable Hairpin Bandpass Filter using Aperture Coupling with Enhanced Selectivity and Constant Bandwidth
1742	H. Moon, S. Choi, Y. Cho, S. Yun, Sogang University, Seoul, Republic of Korea
	In this paper, a size-reduced aperture-coupled tunable hairpin bandpass filter which has improved selectivity and constant bandwidth is proposed. We used an aperture coupling to reduce the size of the filter and loaded varactor at open stub to make bandwidth constant. Two transmission zeros enhanced selectivity of the filter.

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