High-Gain and Small-Aperture Traveling-Wave Endfire Antenna Based on DSPSL Using Phase-Reversal Technique

In this letter, a high-gain small-aperture traveling-wave endfire antenna based on phase-reversal technique is proposed in the platform of double-sided parallel stripline (DSPSL). The field cancellation effect in conventional DSPSL causes a trade-off between high gain and small aperture. In this work, it is effectively broken by the introduction of phase-reversal crossover. As a result, high-gain endfire radiation at a small aperture can be achieved. The developed antenna forms a good endfire radiation property in the frequency range of 14.2 GHz to 15.6 GHz. The maximum endfire gain is measured to be 16 dBi at 15.1 GHz with a small cross-sectional aperture of only 0.15λ × 0.06λ. The simulated and measured results are found in good agreement with each other in the entire operating band. The proposed antenna has a few unique advantages—that is, high gain, small aperture, low profile, and low cost—and it is valuable for applications in advanced wireless communication.