Total array pattern characteristics of coplanar vivaldi antenna in E-plane with different element width for S and C band application

摘要

Co-planar Vivaldi antenna can be designed for broadband applications. The operating band of a Vivaldi depends on antenna parameters such as antenna length and width, feeding, substrate, the slope and opening width of the tapered slot. Moreover, a broadband antenna might exhibit varying radiation pattern in each its operating frequency. In a Vivaldi array, width of the element antenna determines the total array pattern especially on the E-plane. If the wideband Vivaldi elements are arranged without gaps between elements on the E-plane, it would obtain the less desirable total array pattern at higher frequency, specifically for antenna width more than one wavelength of its operate frequency. Our paper presents total array pattern of Co-planar Vivaldi antenna as influenced by the element width. Each element is designed with the same length but different widths. It can improve main lobe and side lobe level performance at center and higher frequency if it compared to array with the same width of elements. For center frequency 5 GHz, directivity of array with different width of element is 11.6 dBi and it has side lobe level is -9.2 dB. Whereas array with the same width of element has directivity is 10.7 dBi and SLL as -4 dB. It is generally shows a promising potential after further development for use in applications in the S and C band.