Enhancement of Front-to-Back Ratio for a High-Gain Endfire Traveling Wave Antenna Using Shorting Posts

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Abstract
In this communication, a novel technique is proposed to enhance the front-to-back ratio (FTBR) for an endfire traveling wave antenna by using shorting posts. Without matching load at the terminal, the proposed technique has the advantage of low cost and avoids heating caused by load, especially for high power application. An endfire traveling wave antenna is developed to achieve high gain with a simple structure, comprising an air-filled offset parallel transmission line with closely loaded identical dipoles. However, the initial design suffers from the substantial reflected wave that degrades the FTBR. To enhance the FTBR of the antenna, two shorting posts are introduced. With multiple reflections induced by the shorting posts and the opened end, the magnitude of the total reflected wave is substantially suppressed and the FTBR is enhanced consequently. The final design, with simple structure and lost cost, is fabricated and measured. With a compact size of 4.76 λ0× 0.43 λ0×0.03 λ0, the antenna achieves a peak gain of 15.45 dBi and a high FTBR of over 15 dB in a fractional band of about 12%.
Funding Information
  • Natural Science Foundation of China (62171480)

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