Microstrip Reflectarray Design for 26 GHz
A microstrip reflectarray design for 26 GHz achieved high gain and bandwidth with variable unit cell size and different feed antenna distances.
Researchers designed a microstrip reflectarray for 26 GHz using a variable size unit cell approach. The design consisted of a foam and substrate layer between ground and reflective layers. Two arrays were created, one with the feed antenna 160 mm away and the other 320 mm away. Simulation results showed that the array with the feed antenna 160 mm away achieved a higher gain of 30.2 dBi and a 3-dB gain bandwidth of 11%, while the array with the feed antenna 320 mm away achieved a gain of 29.8 dBi and a 3-dB gain bandwidth of 14%.
Abstract
This paper presents microstrip reflectarray design using variable size unit cell approach for 26 GHz, and investigates the effect of feed antenna distance to the surface. The unit cell structure is made up of a 1.5 mm foam layer (εr=1.37) and a 0.787 mm substrate layer (εr=2.2) between the ground and reflective layers. Two arrays of 14λx14λ in size were designed to reflect the incoming wave in the θ=25º direction; the distance to the feed was 160 mm in one design and 320 mm in the other design. Simulation results show gain of 30.2 dBi for the former and 29.8 dBi for the latter. 3-dB gain bandwidths were 11 % and 14 %, respectively
References
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Aqrab, I., Clarke, H. G., Alhennawi, M. (2022). Microstrip Reflectarray Design for 26 GHz. *The European Journal of Research and Development*, 2(4), 169-177. https://doi.org/10.56038/ejrnd.v2i4.191
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