Yen-Liang Kuo

Printed double-T monopole antenna for 2.4/5.2 GHz dual-band WLAN operations

A novel and simple printed dual-band double-T monopole antenna is proposed. The antenna comprises two stacked T-shaped monopoles of different sizes, which generate two separate resonant modes for the desired dual-band operation. The proposed antenna has a low profile and can easily be fed by using a 50 /spl Omega/ microstrip line. Prototypes of the proposed antenna designed for WLAN operations in the 2.4 and 5.2 GHz bands have been constructed and tested. Good radiation characteristics of the proposed antenna have been obtained. Effects of varying the monopole dimensions and the ground-plane size on the antenna performance have also been studied.

Printed inverted-F antennas for applications in wireless communication

Introduction Conventional inverted-F antenna is obtained by top-loading a short monopole with a shorted horizontal wire of about a quarter-wavelength. This kind of inverted-F antenna has the advantage of low profile and better matching to 50 Q, and can be mounted above a ground plane or printed on a dielectric substrate [ I ] , [2]. For the latter structure on a dielectric substrate, the inverted-F antenna is capable of integration with the associated circuitry on the same dielectric substrate, which can reduce the fabrication cost and the required volume of the whole system. In this article, we present two promising designs of printed inverted-F antenna. One is a dual-band design for applications in WLAN (wireless local area network, 2400-2484 MHz) and HIPERLAN (high-performance radio local area network, 5150-5350 MHz) systems. The second one is a folded inverted-F antenna printed on a dielectric substrate and fed by a coplanar waveguide (CPW) for UMTS (universal mobile telecommunication system, 1920-2170 MHz) applications. Details of the proposed antenna and experimental results are presented.

Dual-polarized monopole antenna for WLAN application

The authors present a novel dual-polarized antenna design for WLAN application in the 2.4 GHz band (2400-2484 MHz). The antenna consists of two simple planar monopoles printed and integrated on a circuit board for the WLAN application. The two monopoles are placed 90/spl deg/ apart, and between them, a protruded ground plane of suitable dimensions is introduced. In addition, since the proposed antenna is printed on the circuit board, the overall antenna volume is greatly reduced, and the antenna also becomes very easy to implement and has a lower fabrication cost.

A circularly polarized microstrip antenna with a photonic bandgap ground plane

The characteristics of a corner-truncated square microstrip antenna with a photonic bandgap (PBG) ground plane have been experimentally studied. Results indicate that, when the PBG structure in the ground plane has a stopband for EM wave propagation covering the operating frequencies of the circularly polarized microstrip antenna studied, enhanced antenna performances can be obtained even for the case where a thin dielectric substrate is used. Details of the PBG structure studied and the obtained experimental results are presented.