NDLI: Broadening the Bandwidth of Electrically Small Antennas using Multi-Mode Synthesis

Content Provider	IEEE Xplore Digital Library
Author	Kuo, J.W. Wang, Y.E.
Copyright Year	2008
Description	Author affiliation: Electr. Eng. Dept., Univ. of California at Los Angeles, Los Angeles, CA (Kuo, J.W.; Wang, Y.E.)
Abstract	Traditional broadband antenna designs with compact radiating elements often explores the multiple resonant modes existing in the designed physical structure to obtain more bandwidth, or say to decrease the quality factor. It is well-known that antenna arrays could support multiple radiation modes. Recently, the modes in a coupled antenna system have been explored for MIMO and for beam-forming applications in a compact radiation platform. The underlying physical principle is taking the advantage of the collocated and orthogonal radiation pattern modes. Those modes in a compact radiation space could be isolated with each other after the mode-decomposition network. To maximize the bandwidth of the mode-decoupled antenna array, a systematic approach is proposed to enlarge the bandwidth electrically small antennas of the broadband array. Different from traditional antenna array design whose objective is usually to combine the antenna gain, the approach proposed here is to synthesize a broader bandwidth in the desired frequency range either in a few discrete band or one continuous band. The approach can be directly applied to electrically small antennas to achieve the maximum bandwidth available out of a small form factor platform. Electrically small antennas often utilize wire structures to explore lower quality factor and hence higher bandwidth. It has also been discussed that folded-arm spherical helical antennas exhibit an omni-directional, linearly polarized radiation pattern consistent with that of an electrical dipole.
Starting Page	171
Ending Page	174
File Size	3103766
Page Count	4
File Format	PDF
ISBN	9781424415229
DOI	10.1109/IWAT.2008.4511314
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-03-04
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Dipole antennas Q factor Bandwidth Resonance Optical coupling MIMO Network synthesis Broadband antennas Antenna arrays Antenna radiation patterns
Content Type	Text
Resource Type	Article

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