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Complementary split ring resonators (CSRRs) are applied on a UWB Vivaldi antenna to eliminate some unwanted narrow band services. Based on the sensitivity of band rejection, we successfully separate the whole radiating patch of a Vivaldi antenna into three subareas: The feeding area, where the Vivaldi antenna demonstrates a highly sensitive response to CSRRs with a narrow notching band; The transition-area, where CSRRs transfer a ultra wideband (UWB) Vivaldi into a narrow band antenna; and the rest area, where CSRRs are proved to have little efiects on the antenna bandwidth property. A band notch Vivaldi antenna with 4.8GHz to 5.4GHz rejection band is demonstrated to verify our study from both simulated and measured results.

THE BAND NOTCH SENSITIVITY OF VIVALDI ANTENNA TOWARDS CSRRS