Design and Analysis of Compact H-Like Element Microstrip Reflectarray Antenna for X-Band Applications

This paper introduces a design and analysis method of a microstrip reflectarray antenna (MRA) with a proposed H-like shape radiating element at a frequency of 10.5 GHz. The proposed structure has been analyzed and compared with the traditional square shape one. It is found that the H-like element shape presents a good phase range to compensate for the frequency fluctuation of the differential spatial phase delay even when the single layer printed patches are applied. It is also found that this reflectarray has maximum realized gain of 29.3dB with radiation efficiency of 92.3%, half-power beamwidth (HPBW) of 5.6º, and very low side-lobe level (SLL) of about -32.4dB. This reflectarray is found to possess a volume reduction of about 43.24% compared with the traditional square shape one.