EFFECT OF FREQUENCY NOTCHING TECHNIQUE ON ULTRA-WIDEBAND ANTENNA PERFORMANCE

• G. A. Fadehan

  Department of Electrical and Electronics Engineering, Federal University of Technology, Akure, Ondo State, Nigeria

• K. B. Adedeji

  Department of Electrical and Electronics Engineering, Federal University of Technology, Akure, Ondo State, Nigeria

• K. F. Akingbae

  Department of Information and Communication Technology, Federal University of Technology, Akure, Ondo State, Nigeria

Effect of frequency notching techniques on the performance of ultra-wide band antenna was presented in this paper. Four different frequency notching techniques namely Electromagnetic Band Gap (EBG), Slot, Complimentary Slip Ring Resonator (CSRR), and Stub were study and performed on a 32 × 24 mm rectangular antenna. The lower two corners of the antenna were cut to expand the impedance bandwidth. High frequency structure simulator (HFSS) and Computer simulation structure (CST) was used as simulation tool to examine the antenna responses to the techniques of frequency notch and their effects on the antenna performance. Antenna radiation pattern, radiation efficiency, directivity, and bandwidth of the antenna were simulated, and analyzed to study the notching effect on the antenna. Simulation results show that the frequency notching techniques have an impact on the antenna performance. The results of each of the notching techniques gave an improvement in antenna directivity when certain portion of frequency band was notched to when there was no frequency notch. For instance, the antenna directivity before notch at frequency 7.39GHz, 3.66GHz, 4.35GHz 3.46GHz for EBG, Slot, CSRR, and Stub were 5.694 dBi, 2.535dBi, 3.018dBi, 2.299dBic, and were increased to 4.321dBi, 4.491dBi, 4.709dBi and 3.065dBi respectively except the EBG. From the study, it is clearly seen that with careful design analysis by antenna designer, the frequency notch will only impair the antenna performance at the notched band while improving the antenna directivity, gain and successfully avoiding interferences with any other narrow band applications within the same frequency band.

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