Implementation of Non-Uniform Slot for Radiation Characteristics Improvement of Slot Substrate Integrated Waveguide Antenna

In wireless communication, the development of Wireless Local Area Network (WLAN) allows mobility and flexibility to existing infrastructure, especially with high user density. An antenna is presented with a compact size, lightweight, low cost, and easy to integrate with other electronic devices to ensure communication can run flawlessly. In this study, a microstrip antenna was integrated with Substrate Integrated Waveguide (SIW). The integration of the SIW structure is intended to obtain a waveguide-based array slot antenna for WLAN applications. The design of the SIW slot antenna operates at a frequency of 2,4 GHz. The SIW slot antenna has a total thickness of 1,6 mm with dimensions of 376 mm × 40 mm. The proposed SIW slot antenna uses an FR4 epoxy dielectric substrate by using a microstrip line feeding through the SMA connector. The SIW slot antenna has 8 longitudinal slots with non-uniform slot lengths to improve radiation characteristics. The measurement results of the SIW-based slot array show the bandwidth achieved 92 MHz with a frequency range of 2,323 GHz to 2,415 GHz with dimensions of 378 mm × 38 mm. Meanwhile, the gain resulted from the non-uniform slot length is 4,07 dBi