Summary
International Symposium on Antennas and Propagation
2009
Session Number:1B2
Session:
Number:1B2-2
Internal Dual-Mode Monopole Antenna for Mobile Phone Application
Yung-Tao Liu, Saou-Wen Su,
pp.73-76
Publication Date:2009/10/21
Online ISSN:2188-5079
Summary:
Planar metal-plate monopole antennas are easy to implement and can provide a wide impedance bandwidth [1, 2], making them very promising to be applied to some wireless mobile devices [3]. However, conventional planar monopole antennas usually have a large profile and need to be protruded from the mobile phone casing when used as mobile phone antennas, which greatly limits its practical applications. In this paper, we demonstrate a promising wideband metal-plate monopole antenna for mobile-phone applications, especially for dual-mode mobile phone capable of mobile (UMTS) and wireless local area network (2.4/5.2/5.8 GHz WLAN) communications. The proposed antenna occupies a compact volume of 10 × 20 × 20 mm3 only, making it very promising to be embedded within the casing of a practical mobile phone. Note that, the proposed antenna has an asymmetrical twobranch feeding strip for input section. This structure is very promising for achieving bandwidth enhancement for a planar monopole antenna, which can easily provide a wide operating bandwidth of about 5 GHz (1818?6746 MHz here). In addition, the antenna with the proposed feeding strip together can easily be fabricated using a single metal plate, and no external feeding network [4] is required. Details of the antenna design are described, and the experimental results of a constructed prototype are presented.