a new wideband cpw-vivaldi antenna for the detection of breast tumors in microwave imaging system

This paper presents a new wide-band cpw vivaldi antenna for breast tumor detection. first, a simple cpw-fed vivaldi antenna is designed based on two-term exponential equations. the coefficient of the exponential terms and the parameters of the antenna fed are optimized for the best impedance matching at the uwb frequency band. then, peripheral slots are added to the antenna to improve the impedance matching and gain. a prototype of this antenna is fabricated, and the scattering parameters and radiation patterns are measured. the proposed antenna achieves a wide bandwidth of 2.9–10.8 ghz with a vswr < 3.5 and 4.2–10.2 ghz with a vswr < 2, along with a peak gain exceeding 1 dbi. finally, microwave imaging with the help of six samples of the proposed antenna is done. an image of a cancerous tissue inside a breast is reconstructed using the delay and sum method, successfully detecting a 20 mm spherical tumor. all the results show that a suitable antenna for a microwave imaging system is proposed.