NDLI: Isolation Enhancement Between Two Closely Packed Antennas

Content Provider	IEEE Xplore Digital Library
Author	Mak, A.C.K. Rowell, C.R. Murch, R.D.
Copyright Year	1963
Abstract	This paper introduces a coupling element to enhance the isolation between two closely packed antennas operating at the same frequency band. The proposed structure consists of two antenna elements and a coupling element which is located in between the two antenna elements. The idea is to use field cancellation to enhance isolation by putting a coupling element which artificially creates an additional coupling path between the antenna elements. To validate the idea, a design for a USB dongle MIMO antenna for the 2.4 GHz WLAN band is presented. In this design, the antenna elements are etched on a compact low-cost FR4 PCB board with dimensions of 20times40times1.6 mm³. According to our measurement results, we can achieve more than 30 dB isolation between the antenna elements even though the two parallel individual planar inverted F antenna (PIFA) in the design share a solid ground plane with inter-antenna spacing (Center to Center) of less than 0.095 lambda_o or edge to edge separations of just 3.6 mm (0.0294 lambda_o). Both simulation and measurement results are used to confirm the antenna isolation and performance. The method can also be applied to different types of antennas such as non-planar antennas. Parametric studies and current distribution for the design are also included to show how to tune the structure and control the isolation.
Sponsorship	IEEE Antennas and Propagation Society
Starting Page	3411
Ending Page	3419
Page Count	9
File Size	949835
File Format	PDF
ISSN	0018926X
Volume Number	56
Issue Number	11
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	MIMO Antenna measurements Solids Mutual coupling Antenna arrays Receiving antennas Antenna feeds Antennas and propagation Frequency Universal Serial Bus wireless communications Diversity antennas multiple input and multiple output (MIMO) mutual coupling planar inverted F antenna (PIFA)
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering

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