Saou-Wen Su

Ultrawide-band square planar metal-plate monopole antenna with a trident-shaped feeding strip

A square planar metal-plate monopole antenna fed by using a novel trident-shaped feeding strip is presented. With the use of the proposed feeding strip, the square planar monopole antenna studied shows a very wide impedance bandwidth of about 10 GHz (about 1.4-11.4 GHz, bandwidth ratio about 1:8.3), which is larger than three times the bandwidth obtained using a simple feeding strip (about 1.5-3.3 GHz, bandwidth ratio about 1:2.3). In addition, the proposed feeding strip can be integrated with the square planar monopole, that is, the feeding strip and the square planar monopole together can be easily fabricated using a single metal plate, making the proposed antenna easy to construct at a low cost. Details of the experimental and simulation results for the proposed planar monopole antenna are presented and analyzed.

Internal shorted patch antenna for a UMTS folder-type mobile phone

A novel design of feeding and short-circuiting an internal patch antenna for mobile phones is presented. The patch antenna comprises a simple rectangular patch that is fed through and short-circuited to a small ground plane (denoted as antenna ground here) which protrudes from the main or bottom ground of a folder-type mobile phone. With the presence of the small antenna ground, which can function as a shielding wall, the proposed antenna can be placed in close proximity to the RF shielding metal box in the mobile phone, with very small effects on the antenna performances. A design example of the proposed antenna for Universal Mobile Telecommunication System (UMTS) (1920/spl sim/2170MHz) operation is demonstrated. Experimental and simulated results are presented.

Internal Ultrawideband Monopole Antenna for Wireless USB Dongle Applications

A novel, ultrawideband (UWB) monopole antenna suitable to be mounted on the printed circuit board (PCB) of a wireless, universal, serial-bus (USB) dongle as an internal antenna is presented. The proposed antenna in the study is a U-shaped, metal-plate monopole antenna, easily fabricated from bending a simple metal plate onto a foam base of a compact size of 6times11times20 mm3. The antenna mainly comprises a pair of wide-ended radiating arms and a bevel-feed transition. When the antenna is mounted at the top portion of the PCB, one end of the radiating arm is also short-circuited to the system ground plane. With the proposed antenna structure, which can provide a very wide operating bandwidth of larger than 7.6 GHz, the antenna impedance bandwidth can easily cover the 3.1-10.6 GHz UWB band. Details of the antenna design are described, and experimental results of the constructed prototypes are presented and discussed

Broadband omnidirectional metal-plate monopole antenna

A novel broad-band omnidirectional metal-plate monopole antenna is presented. The proposed antenna is a step-shaped metal-plate monopole, which is easily fabricated from bending a metal plate (a 0.2 mm thick brass sheet used in this study). The proposed antenna shows improved omnidirectional radiation for frequencies across a very wide operating bandwidth (frequency ratio about 1:3), compared to a corresponding planar monopole antenna. Details of the proposed antenna design are described, and the experimental performance of some prototypes is studied.

Broadband Printed Dipole Antenna With a Step-Shaped Feed Gap for DTV Signal Reception

A broadband printed dipole antenna capable of generating a wide operating band for digital television signal reception in the 470-806 MHz band is presented. The antenna is of a rectangular shape of width 20 mm and length 227 mm , and comprises two asymmetric radiating portions of arm 1 and arm 2 separated by a step-shaped feed gap with its one open end at the center of antennas one long side edge and the other open end at about /4 away from the center of the opposite long side edge. The antenna can generate two adjacent resonant modes to form a wide operating band of larger than 50% in 2.5:1 VSWR bandwidth, which is much wider than that of the corresponding conventional center-fed dipole antenna.

Wideband monopole antenna integrated within the front-end module package

A novel wideband monopole antenna integrated within the front-end module package for WLAN and/or WiMAX operation in the 5 GHz band for a mobile device is presented. The front-end module package mainly comprises a bent /spl pi/-shaped wideband monopole antenna for 5 GHz band operation and a shielding metal case for accommodating the associated module and circuitry. The antenna is integrated to the shielding metal case through short-circuiting. For practical applications, the proposed front-end module package is to be mounted at one of the corners of the system circuit board of the mobile device. In this case, the shielding metal case not only performs as part of the ground plane of the antenna, but also functions as a shielding metal block to shield the antenna from the undesired coupling with nearby electronic or conducting elements in the mobile device. The proposed design of the front-end module package with an embedded antenna is studied, and obtained results of the constructed prototypes are presented.

Compact printed band-notched ultra-wideband slot antenna

We present a compact printed circular wide slot antenna having an UWB operating bandwidth with a band-notched frequency band at 5 GHz. The band-notched operation is achieved by using a U-slotted circular stub for the antenna. It is found that by adjusting the length of the U-slot cut in the circular stub to be about a half-wavelength at the desired notched frequency, a destructive interference can take place, causing the antenna to be non-responsive at that frequency. Details of the proposed antenna are described, and results for a constructed prototype are presented.

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.

Internal shorted patch antenna integrated with a shielding metal case for UMTS mobile phone application

An internal shorted patch antenna integrated with a shielding metal case for UMTS mobile phone application has been constructed and tested, and good radiation characteristic has been also observed. The constructed prototype integrates the antenna and the shielding metal case, which provides a coupling-free space for the RF components, battery and other associated elements in the mobile phone. The integrated antenna shows no protruded portions and is very promising to be concealed within the casing of the mobile phone. Furthermore, the antenna occupies no space on the bottom ground or system ground plane. Experimental results have also indicated that the antenna shows acceptable impedance matching characteristic.

Internal shorted patch antenna for UMTS mobile phone

In this paper we present a new internal mobile telephone antenna design to eliminate the required isolation distance between the antenna and the RF shielding metal box to provide a promising alternative for integrating various elements inside a mobile telephone. A design example of the proposed shorted patch antenna applied to a UMTS (Universal Mobile Telecommunication System, 1920/spl sim/2170 MHz) folder-type mobile telephone is demonstrated. Results of a constructed prototype are presented and discussed.