H. I. Hraga

A Low-Profile Ultra-Wideband Modified Planar Inverted-F Antenna

A miniaturized modified planar inverted-F antenna (PIFA) is presented and experimentally studied. This antenna consists of a planar rectangular monopole top-loaded with a rectangular patch attached to two rectangular plates, one shorted to the ground and the other suspended, both placed at the optimum distance on each side of the planar monopole. The fabricated antenna prototype had a measured impedance bandwidth of 125%, covering 3 to 13 GHz for reflection coefficient better than -10 dB. The radiator size was 20×10×7.5 mm3, making it electrically small over most of the band and suitable for incorporation in mobile devices. The radiation patterns and gains of this antenna have been cross-validated numerically and experimentally and confirm that this antenna has adequate characteristics for short range ultra-wideband wireless applications.

Compact microstrip antenna design for microwave imaging

An ultra-wideband microstrip antenna design is considered with respect to applications in breast cancer detection. The underlying design concept is based on ground penetrating radar (GPR). Simulated and measured prototype performance show excellent performance in the input impedance and radiation pattern over the target range from 4 GHz to 8 GHz. The 4 GHz to 8GHz frequency band for microwave imaging perform better in comparison with other microwave frequencies. The antenna also shows a reasonable uniform radiation performance in the broadside direction which contributes to the reduction of clutter levels, thus aiding the reconstruction quality of the final image

Design studies of ultra-wideband microstrip antenna for ultra-wideband communication

This paper presents a circular printed monopole antenna for the Ultra-Wideband (UWB) applications. The antenna achieved over all bandwidth of 120% from operating frequency from 3.1 to 11.5 GHz for return loss <-10dB. The parameters of the antenna which affect the performance of the antenna are investigated. The computed and experimental results of the return loss and radiation patterns are in good agreement. These results evident that the proposed antenna can yield an ultra-wide impedance bandwidth with a good radiation patterns over the required operating band. Thus, these features make this antenna suitable to be used in wireless ultra-wideband communication.

A Compact UWB Antenna Design for Breast Cancer Detection

Near fleld imaging using microwave in medical applications has gain much attention recently as various researchers show its high ability and accuracy in illuminating object compares to well known screening tools. This paper documents the development of new compact ultra wide bandwidth antenna designed primarily for microwave imaging application such as breast cancer detection. A parametric study is carried out using two well known softwares packages to achieve optimum antenna performances. The performance of the Prototype antenna is tested and analyzed experimentally and exhibit reasonable agreement with the simulations.

Miniature Dual-Band and Wideband Planar Inverted F-L-Antennas for Wireless Local Area Network and Ultra-Wideband Applications

Abstract By applying the magnetic wall concept, compact dual-band and wideband low-profile planar inverted F-L antennas for wireless local area network (WLAN) (2.4 GHz/5.2 GHz) and ultra-wideband (UWB) applications are proposed. The dual-band antenna shows a relative bandwidth of 12% and 10.2% in the ISM-2400 and IEEE 802.11a frequency bands, respectively, at reflection coefficient |S11| ≤ −10 dB. By carefully tuning the geometry parameters of the dual-band design, the two resonant frequencies can be merged to form a wide bandwidth antenna to cover 3,000 to 5,400 MHz (57% relative bandwidth) for a similar reflection coefficient |S11|; this fully covers the lower band UWB (3.1–4.8 GHz) spectrum. The experimental and simulated results in terms of reflection coefficient, gain, radiation efficiency, and field pattern of the two antennas on a small finite ground plane of size 30 mm × 15 mm show good agreement.

Design of a planar inverted F-L antenna (PIFLA) for lower-band UWB applications

This paper examines the case for an ultrawideband planar inverted-F-L-antenna design intended for use in the lower sub-band. The antenna construction is based on the conventional inverted F, and inverted L as its feed element, and parasitic element, respectively. The optimized antenna size is 30×15×4mm3. The prototype antenna has a good return loss of −10 dB, and a 66.6% impedance bandwidth (2.8 GHz–5.6 GHz), the gain varies between 3.1 dBi and 4.5 dBi.

Miniaturised UWB antenna for a Wireless Body Area Network

A miniaturised modified planar inverted-F UWB antenna with a broadband rectangular feeding structure, for a Wireless Body Area Network (WBAN), is proposed. The antenna is designed to cover a wide frequency range from 3 GHz to 13 GHz. Details of the proposed antenna design and measured results are presented and discussed. To validate the results, a prototype was fabricated and tested. The measured and computed results are in good agreement. The overall size of the antenna including the ground plane is 50 mm × 50 mm × 8 mm, making it suitable to fit into a standard enclosure of a UWB wireless transceiver.