A microstrip patch-based antenna design using open circuit matching and slot-loading techniques for Wi-Fi / Bluetooth applications
Abstract
Microstrip patch antennas (MPAs) are widely used in various applications due to their compact structure, low cost, ease of fabrication, and wide bandwidth spectrum characteristics. In this study, impedance matching techniques are employed to design a directional antenna that operates within the Wi-Fi and Bluetooth bands, effectively utilizing the MPA spectrum. To enhance radiation performance, slot opening, and open circuit matching methods are applied to the conventional rectangular MPA structure. The designed antennas are simulated using finite element methods in the high-frequency structural simulator (HFSS) program and compared with actual antenna measurements. The experimental results show that the slotting and feed line stub insertion methods improve the antenna directivity by reducing the 3 dB beamwidth of the MPA by 10%. The proposed antenna exhibits an operational bandwidth ranging from 2.42 to 2.5 GHz with a return loss below -10 dB, effectively covering the 2.4 GHz Wi-Fi and Bluetooth frequency bands. Both simulation and measurement results show that the return loss, surface current distribution, and electric field distribution of the antenna meet the expected values. The design proves effective in wireless communication applications with a gain of 5.41 dBi.
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URN: https://sloi.org/urn:sl:tjoee101346
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