Low-cost nonplanar microstrip-line ferrite phase shifter utilizing circular polarization

A low-cost microwave ferrite phase shifter is proposed in this paper. The phase shifter is comprised of three parallel nonplanar microstrip lines separated from a ground plane by a substrate containing a ferrite rod/slab. The amount of phase shift between the input and output ports is determined by...

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Bibliographic Details
Published in:IEEE microwave and wireless components letters 2004-01, Vol.14 (1), p.25-27
Main Authors: Sorensen, R.K., Iskander, M.F., Lee, J.J.
Format: Article
Language:English
Subjects:
Applied sciences
Calcium aluminum ferrite
Circuit properties
Devices
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Feeds
Ferrite
Ferrites
Geometry
Ground plane
Magnetic separation
Microstrip
Microstrip lines
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Microwaves
Phase shift
Phase shifters
Polarization
Power dividers
Radar
Slabs
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Summary:A low-cost microwave ferrite phase shifter is proposed in this paper. The phase shifter is comprised of three parallel nonplanar microstrip lines separated from a ground plane by a substrate containing a ferrite rod/slab. The amount of phase shift between the input and output ports is determined by the strength of the magnetic bias field applied to the ferrite. A three-way power divider was designed to feed the microstrip lines with different magnitudes and phases. By combining the effects of the nonplanar geometry and the phase offsets introduced by the feed network, circularly polarized waves can be produced in the ferrite. These waves strongly interact with the biased ferrite resulting in a large phase shift over a short distance-90/spl deg//cm based on current simulation results. This device will be best suited for use in high-gain phased-array radar systems.
ISSN:1531-1309
2771-957X
1558-1764
2771-9588
DOI:10.1109/LMWC.2003.821494