A compact and selective low-pass filter with reduced spurious responses, based on CPW tapered periodic structures

This paper describes a new low-pass filter topology based on tapered periodic structures. These filters exhibit interesting characteristics in terms of compactness, return loss, insertion loss, selectivity, and the suppression of spurious frequency bands. Hybrid prototypes with a 1-GHz cutoff freque...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2006-06, Vol.54 (6), p.2367-2375
Main Authors: Kaddour, D., Pistono, E., Duchamp, J.-M., Arnould, J.-D., Eusebe, H., Ferrari, P., Harrison, R.G.
Format: Article
Language:English
Subjects:
Applied sciences
Band pass filters
Bragg cutoff frequency
Capacitors
Circuit properties
Compatibility
Computer Science
Coplanar waveguides
Cutoff frequency
Dielectric, amorphous and glass solid devices
Electric, optical and optoelectronic circuits
Electromagnetism
Electronic circuits
Electronics
Engineering Sciences
Exact sciences and technology
Frequency bands
Frequency filters
Frequency measurement
Insertion loss
Low pass filters
Micro and nanotechnologies
Microelectronics
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Microwave filters
Microwaves
Noise levels
Periodic structures
Prototypes
Ripples
Selectivity
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Signal and Image processing
spurious frequency suppression
tapered structures
Topology
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Summary:This paper describes a new low-pass filter topology based on tapered periodic structures. These filters exhibit interesting characteristics in terms of compactness, return loss, insertion loss, selectivity, and the suppression of spurious frequency bands. Hybrid prototypes with a 1-GHz cutoff frequency, based on a coplanar-waveguide technology, and using both low-cost and high-performance substrates, have been fabricated and measured. Spurious frequency bands can be suppressed to below -22 dB at frequencies up to 20 GHz. Passband ripples are negligible, and the return loss is better than 20 dB. A two-section filter has a length of 0.2 lambda and exhibits a -120-dB/dec selectivity, while a six-section filter is 0.51 lambda long and has a -560-dB/dec selectivity. A design procedure has been established. These filters are compatible with monolithic microwave integrated circuit technologies in which the capacitors can be realized as metal-insulator-metal structures
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2006.875290