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Investigation on a Multi-Band Inverted-F Antenna Sharing Only One Shorting Strip among Multiple Branch Elements Tuan Hung NGUYEN Takashi OKI Hiroshi SATO Yoshio KOYANAGI Hisashi MORISHITA Publication IEICE TRANSACTIONS on Communications Vol.E98-B No.7 pp.1302-1315 Publication Date: 2015/07/01 Online ISSN: 1745-1345 DOI: 10.1587/transcom.E98.B.1302 Type of Manuscript: PAPER Category: Antennas and Propagation Keyword: multi-band, inverted-F antenna, small antenna, handset antenna, low-profile, infinite ground plane, Full Text: PDF>>
Summary: This paper presents the detailed investigations on a simple multi-band method that allows inverted-F antennas (IFAs) to achieve good impedance matching in many different frequency bands. The impressive simplicity of the method arises from its sharing of a shorting strip among multiple branch elements to simultaneously generate independent resonant modes at arbitrary frequencies. Our simulation and measurement results clarify that, by adjusting the number of branch elements and their lengths, it is very easy to control both the total number of resonant modes and the position of each resonant frequency with impedance matching improved concurrently by adjusting properly the distance ds between the feeding and shorting points. The effectiveness of the multi-band method is verified in antenna miniaturization designs, not only in the case of handset antenna, but also in the design upon an infinite ground plane. Antenna performance and operation principles of proposed multi-band models in each case are analyzed and discussed in detail. | |||||
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