Yuan-Chih Lin

Thin internal GSM/DCS patch antenna for a portable mobile terminal

A novel internal dual-band patch antenna with a small thickness of 3 mm for application in Global System for Mobile Communication/Digital Communication System (GSM/DCS) mobile terminals such as the mobile phone or Personal Digital Assistant (PDA) phone is presented. The patch antenna occupies an area of 15/spl times/60 mm/sup 2/, with its top patch embedded with a simple T-shaped slit, which separates the top patch into two resonant paths to generate two resonant modes for 900/1800 MHz operation. Then, by extending a small portion of the top patch beyond the top edge of the system ground plane of the mobile terminal, the antenna can provide two wide bandwidths covering the GSM/DCS bands. The proposed antenna is experimentally studied, and effects of the extended top-patch portion and the ground-plane length on the obtained bandwidths are discussed.

Internal Patch Antenna With a Thin Air-Layer Substrate for GSM/DCS Operation in a PDA Phone

A thin dual-band internal patch antenna for Global System for Mobile Communication, 890-960 MHz/Digital Communication System, 1710-1880 MHz (GSM/DCS) operation in a Personal Digital Assistant (PDA) phone is presented. The antenna can generate two wide resonant modes for GSM (890-960 MHz) and DCS (1710-1880 MHz) operation, yet it requires an air-layer substrate of thickness 4 mm only, which is among the thinnest internal mobile phone antennas that have been reported. The antennas top patch comprises a resonant narrow strip supporting a longer resonant path for GSM operation and a resonant subpatch supporting a shorter resonant path for DCS operation. By including a suitable widened end portion for the narrow strip and a suitable tapered end portion for the subpatch, increased bandwidths for the proposed thin internal mobile phone antenna are obtained. Detailed design considerations of the proposed antenna are described. In addition, the users hand effects on the performances of the proposed antenna are studied

Printed PIFA EM Compatible With Nearby Conducting Elements

A novel printed planar inverted-F antenna (PIFA) with two shielding strips to allow the antenna to be electromagnetic (EM) compatible with nearby conducting elements is presented. That is, the proposed printed PIFA can be placed in very proximity to nearby conducting elements with small or negligible effects on the antenna performances. This attractive feature is mainly because the antennas possible EM fringing fields are suppressed by the two added shielding strips at the feed and end portions of the printed PIFA. Details of the proposed printed PIFA are described, and a design example for wireless local area network operation in the 2.4 GHz band is studied.

Conformal bluetooth antenna for the watch-type wireless communication device application

A promising conformal Bluetooth monopole antenna in the watch-type wireless device has been proposed. The proposed antenna is short-circuited to an upper ground plane mounted above the system ground plane. Results have indicated that, with the proposed arrangement, the radiation efficiency can reach about 50% over the band with the presence of the users forearm. In addition, the antenna shows a low profile of 4 mm only, and the thickness of the wireless device can be about 10 mm only, which makes it very promising and attractive to be worn around the users wrist or forearm for practical applications.

Thin Internal GSM/DCS Patch Antenna for Mobile Phones

A thin internal patch antenna with an air-layer substrate thickness of 4 mm only for GSM/DCS operation has been proposed. The enhanced bandwidths of the antenna are obtained by adding a widened end portion to the longer resonant path and a tapered end portion to the shorter resonant path, which are expected to result in more smooth surface current distributions in the end portion of the antennas two resonant paths, thereby leading to bandwidth enhancement. With its thin profile, the antenna is very promising for thin mobile phone applications

Broadband monopole antenna for DTV reception and gsm operation in the mobile phone

A broadband monopole antenna comprising a narrow radiating strip of length 120 mm and a simple internal matching portion for mobile phone application is presented. The monopole antenna can generate a wide operating band to cover the DTV reception in the UHF frequency band (470-862 MHz) and mobile communication in the GSM850/900 bands (824-894 MHz/890-960 MHz). The radiating strip is also promising to be retracted to be concealed inside the casing of the mobile phone when not in use. Details of the proposed antenna are described in the paper.