what is different between the Boe tie antenna and Rounded bowtie antenna?

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Electrical Engineering

what is different between the Boe tie antenna andRounded bowtie antenna?

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AbstractIn this paper three types of novel bowtie antennas with round corners are presented and studied carefully including quadrate roundededge and triangular shapes which have better return loss flatter input impedance more stable radiation patterns and smaller area at the same time The effect of round corners is attached importance to due to their novelty The conclusion is drawn that adding the round corners at the sharp vertexes of radiation surfaces can have positive effects on performances of not only bowtie antennas but also the others 1 INTRODUCTION Much attention has been paid to ultra wide band UWB systems in which UWB antennas are the important components As one of UWB antennas bowtie antennas fed by coaxial line 1 2 coplanar waveguide 3 12 and stripline 4 have many advantages such as low profile ultra wide impedance band high radiation efficiency and easy to manufacture etc They are used in many domains due to the advantages mentioned above such as ground penetrating radar 68 and pulse antennas 1 2 9 However the patterns of bowtie antenna are not ideal in full impedance band for pulse exciting because they are distorted greatly in high frequency and its scale is large at the same time In paper 1 the stable patterns from 12 GHz to 3 GHz and wide impedance bandwidth are obtained by RCloaded but the efficiency is reduced greatly Bowtie antenna with a circle cap is designed and fabricated in paper 5 but its reflection coefficient in higher frequency is poor because of the matching network In this paper the performances of three types of bowtie antennas quadrate roundededge and triangular shapes are improved by adding round corners on their radiation surfaces The better return loss flatter input impedance and more stable radiation patterns are obtained at the same time All results for comparison are obtained numerically and the validity of simulations is proved by experiment All these works are used to show that putting round corners at the sharp vertexes of radiation surfaces can bring the positive effects on performances of not only bowtie antennas but also the others 2 COMPARISONS AND ANALYSIS In this section three types of bowtie antennas quadrate rounded edge and triangular shapes are studied carefully including input impedance return loss and gain in normal direction The stability of radiation patterns can be shown by gain in normal direction indirectly which is chosen for studying the former See Answer

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