C.C. Chiau

Study of a printed circular disc monopole antenna for UWB systems

This paper presents a study of a novel monopole antenna for ultrawide-band (UWB) applications. Printed on a dielectric substrate and fed by a 50 /spl Omega/ microstrip line, a planar circular disc monopole has been demonstrated to provide an ultra wide 10 dB return loss bandwidth with satisfactory radiation properties. The parameters which affect the performance of the antenna in terms of its frequency domain characteristics are investigated. A good agreement is achieved between the simulation and the experiment. In addition, the time domain performance of the proposed antenna is also evaluated in simulations.

CPW-fed circular disc monopole antenna for UWB applications

This paper proposes and studies a novel design of a coplanar waveguide (CPW) fed circular disc monopole antenna for ultra wideband (UWB) applications. A circular disc monopole printed on a dielectric substrate and fed by a 50 /spl Omega/ CPW on the same layer is demonstrated numerically and experimentally to yield an ultra wide -10 dB bandwidth with omnidirectional radiation patterns over the entire bandwidth. The effect of the disc dimension on the antenna performance is also investigated.

Planar UWB monopole antennas

This paper presents a summary of two different types of planar UWB monopole antennas, i.e. electric and magnetic types. The electric monopole uses copper disc/ring as the radiating element; while elliptical/circular slot serves as the radiator for the magnetic monopole. The performances of these UWB monopoles are evaluated both numerically and experimentally.

A Miniature Dielectric-Loaded Folded Half-Loop Antenna and Ground Plane Effects

A miniature dielectric-loaded folded half-loop antenna on a mobile terminal operating at 5.2 GHz to cover the IEEE802.11a wireless system is introduced. The length of the proposed antenna is reduced by 50% compared to the dielectric-loaded folded loop antenna in previous studies. The antennas performance is not affected much by changing the size of the ground plane. The return loss and radiation patterns of the antenna are assessed using both a finite integration technique (FIT) simulation and experimental measurements.

CPW-fed circular ring monopole antenna

A novel design of circular ring monopole antenna fed by coplanar waveguide (CPW) is presented and studied for ultra wideband (UWB) applications in this paper. Printed on a dielectric substrate and fed by a 50/spl Omega/ CPW on the same side of the substrate, a circular ring monopole can operate over an ultra wide frequency range with omni-directional radiation patterns over the entire bandwidth. Good agreement has been obtained between the simulation and experiment.

Study and optimisation of a broadband dielectric antenna

This paper presents a study of a broadband dielectric antenna performed through numerical modelling and experimental verification. Upon understanding of the operating principle of the prototype antenna, an optimised design has been demonstrated to provide an even wider impedance bandwidth.

Time domain characteristics of UWB disc monopole antennas

This paper presents a study of UWB disc monopole antennas with an emphasis on their time domain characteristics. Two circular disc monopole antennas with different feeding structures are exemplified. The transfer functions and the received signal waveforms of the disc monopole antennas are investigated experimentally.

A Miniature Broadband Dielectric Resonator Antenna (DRA) Operating at 2.4GHz

This paper presents a study on a broadband DRA using a new feed technique developed at Antenova Ltd, UK. The DRA is designed to operate at 2.4GHz for IEEE802.11b/g applications and has a length of only 0.12λ. Characteristics of the prototype DRA are assessed using both a Finite Integration Technique simulation and experimental measurements.

Dual-band Dielectric Antenna for WLAN Applications

Having gained insights into the operation of a single band dielectric resonator antenna working at 2.4 GHz, a dual-band dielectric resonator antenna is proposed to operate at both 2.4 GHz and 5.2 GHz for IEEE802.11a/b/g applications, based on a novel feeding method. Characteristics of the prototype antennas are assessed using both finite integration technique simulation and experimental measurement.

Evaluation of indoor MIMO channel capacity with a realistic four-element diversity antenna array on a PDA terminal

A simulation study of indoor multiple-input multiple-output (MIMO) channel capacity in a realistic propagation environment using Wireless InSite, a ray tracing simulation tool, is carried out. A realistic mobile station (receiver) consisting of a four-element diversity antenna on a personal digital assistant (PDA) terminal operating at 5.2 GHz is studied. The receiver takes into account mutual coupling and casing effects. The results show that using the four-element diversity antenna on a PDA terminal can offer a significant increase in channel capacity compared to a single-input single-output (SISO) system.