High-directive monopulse microstrip antenna array for DSRC-band application

In this paper, the authors presented a new technique to generate difference (Delta)-pattern in microstrip patch antenna array for monopulse applications. In array, the truncated corner single elements are left-handed and right-handed circularly polarized. The Delta-pattern is generated by placing the left- and right-polarized single elements in same direction along y-axis. The circuit model analysis of a single element and array is presented to analyze the antenna's performance. In order to achieve a lower sidelobe level and stable radiation pattern, a uniform power divider has been designed. Finally, the proposed left- and right-polarized element and array are fabricated and measured. The proposed circularly polarized (CP) elements and array resonates at 5.90 GHz. The array provides null depth of more than -42 dB at theta=0 degrees direction in different phi cuts. The proposed array has a linear gain of 8.71 dBi and radiation efficiency of 77.25%. Furthermore, the simulated and measured results are well matched, which shows the effectiveness of the proposed way to generate the difference pattern for monopulse application.

Automated summary

This paper introduces a new technique for generating a difference pattern in a microstrip patch antenna array for monopulse applications. By utilizing a specific layout and a uniform power divider, the array is able to achieve lower sidelobe levels and stable radiation patterns. Experimental results demonstrate that the array has good gain and radiation efficiency.