M. Z. Mahmud

Ultra-Wideband (UWB) Antenna Sensor Based Microwave Breast Imaging: A Review

Globally, breast cancer is reported as a primary cause of death in women. More than 1.8 million new breast cancer cases are diagnosed every year. Because of the current limitations on clinical imaging, researchers are motivated to investigate complementary tools and alternatives to available techniques for detecting breast cancer in earlier stages. This article presents a review of concepts and electromagnetic techniques for microwave breast imaging. More specifically, this work reviews ultra-wideband (UWB) antenna sensors and their current applications in medical imaging, leading to breast imaging. We review the use of UWB sensor based microwave energy in various imaging applications for breast tumor related diseases, tumor detection, and breast tumor detection. In microwave imaging, the back-scattered signals radiating by sensors from a human body are analyzed for changes in the electrical properties of tissues. Tumorous cells exhibit higher dielectric constants because of their high water content. The goal of this article is to provide microwave researchers with in-depth information on electromagnetic techniques for microwave imaging sensors and describe recent developments in these techniques.

A compact spectacles shaped patch antenna for UWB applications

In this paper, a new compact spectacles shaped patch UWB antenna using a microstrip fed line is proposed. The new design is consist of a spectacles shaped patch along with tapered slot ground plane.The proposed antenna has a compact electrical dimension of 0.24 λ × 0.21 λ × 0.016 λ and fed with a 50-ohm microstrip transmission line. Computer Simulation Technology (CST) based on finite-difference time-domain method and High Frequency Structural Simulator (HFSS) based on finite element method is implemented in this research. In simulation, a wider frequency bandwidth of 8.5 GHz (3.0 – 11.5 GHz) with excellent impedance matching which covers entire UWB frequency, stable radiation pattern and constant gain is achieved. The proposed antenna is low profile, inexpensive and has excellent characteristics of UWB.

A compact slotted patch antenna for ultrawideband application

A compact antenna with ultra wideband characteristics is proposed which covers the dimension of 23 × 21 mm2. It has a rectangular slotted patch with a circular slot, microstrip feed line and a tapered slot ground with a thickness of 1.6 mm which covers the inexpensive FR4 dielectric substrate. The proposed antenna covers a wider bandwidth of 10.1 GHz (2.90–12 GHz) with stable radiation pattern and constant gain which is ideal for UWB applications. The simulation is done with CST and HFSS simulator. The proposed antenna is low cost, compact in size and have good specifications which make it suitable for using UWB applications.