Abstract
This paper presents a dual-loop patch antenna capable of providing high radiation efficiency for operation in close proximity to a lossy medium with permittivity and conductivity close to those of a human torso or arm. For operation as an internal WLAN (wireless local area network) antenna in a wireless device, the dual-loop patch antenna with a low profile of 3 mm can cover the operating bandwidth of the 2.4-GHz band (2400–2484 MHz), showing a high radiation efficiency of about 88%, when placed very close to the lossy medium with only 1-mm spacing. The obtained results make the proposed antenna very promising for body-worn or wearable antenna applications. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 47: 233–236, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21134
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