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Design of Microstrip Patch Antenna using Inset-Fed Layered for Metallic Object in u-Port  

Choi, Yong-Seok (경민대학교 정보통신과)
Seong, Hyeon-Kyeong (상지대학교 컴퓨터정보공학부)
Publication Information
Journal of Satellite, Information and Communications / v.10, no.2, 2015 , pp. 80-85 More about this Journal
Abstract
In this paper, we present, an indstrial RFID layered microstrip patch antenna is designed using an inset feed method in order to improve recognition rates in a long distance as tags are attached to metal object by improving a problem of feeding power in fabricating metal tags and reducing effects of metallic object. The inset feed shows a distinctive characteristic that has no separation between emitters and feed lines differing from a structure with the conventional inductive coupling feed. This structure makes possible to produce a type that presents a low antenna height and enables impedance coupling for tag chips. Although it shows a difficulty in the impedance coupling due to increases in the parasite capacitance between a ground plane and an emitter in an antenna according to decreases in the height of a tag antenna, it may become a merit in designing the tag antenna because the antenna impedance can be determined as an inductive manner if a shorted structure is used for feeding power. Therefore, in this paper the microstrip patch antenna is designed as a modified type and applies the inset feed in order to reduce effects of metallic objects where the antenna is be attached. Also, the antenna uses a multi-layer structure that includes a metal plate between radiator and ground instead of using a single layer.
Keywords
RFID; Microstrip patch antenna; Metallic object; Inset-fed; PSO; u-Port;
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