Two-Element T-Array for Cross-Polarized Breast Tumor Detection

摘要

This paper reports on a computational study of a 2-element cross-polarized antenna array for breast cancer detection. The "Dark Eyes" antenna is used in a T-arrangement to form the array. The antenna return loss is below -10dB in the range 2.3-10.3 GHz and the cross-polarized mutual coupling is less than -30dB for frequencies over 2.4 GHz. Using the finite-difference time-domain (FDTD) method, an ultra-wideband (UWB) pulse is transmitted in the numerical breast phantom and the co- and cross-polarized back-scatter response is recorded from tumors at different locations. The breast phantom was modeled as a simple layered medium of skin and fat. The dispersive properties of layers were introduced through a Debye model. Simulation results for a spherical and a cylindrical tumor of different orientations are presented and discussed.