Substrate thickness variation on the frequency response of microstrip antenna for mm-wave application

Substrate thickness variation on the frequency response of microstrip antenna for mm-wave application

Antenna propagation
Low profile
Microstrip antenna
Regression model equations
Substrate height

Substrate height (Hs) is an important parameter that influences antenna propagation. This research designed a low-profile 28 GHz microstrip antenna on a polyimide substrate with varying Hs using CST Studio software. The simulated results and MINITAB software were used to develop regression model equations, which analyzed the impact of Hs variation on the antenna performance. The proposed models’ equations have indicated an increase in average responses of resonant frequency (Fr), percentage bandwidth (% BW), gain (G), return loss (RL), and efficiency (ƞ) as the Hs decreased. The antenna achieved a BW of 3.87 GHz at Hs 0.525 mm and 5.54 GHz at 0.025 mm, a G of 3.89 dBi at Hs 0.525 mm and 3.91 dBi at Hs 0.025 mm, and an ƞ of 94.19% at Hs 0.525 mm and 98.24% at Hs 0.025 mm. The antenna was fabricated and tested, and the experimental results were validated with the models’ equations. The thinner substrate resulted in an improvement in the antenna performance.

Bello Abdullahi Muhammad1, Mohd Fadzil Ain1, Mohd Nazri Mahmud1, Mohd Zamir Pakhuruddin2, Ahmadu Girgiri1, Mohamad Faiz Mahamed Omar3

Journal homepage: http://journal.uad.ac.id/index.php/TELKOMNIKA

Sep 10, 2025

PERI IRAWAN

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