Compact open-ended SIW antenna based on CRLH-TL and U-shaped slots for Ku-band application

• Published in: International journal of electronics and communications Vol. 131; p. 153595
• Main Authors: Ameen, Mohammad, Mishra, Abinash, Chaudhary, Raghvendra Kumar
• Format: Journal Article
• Language: English
• Published: Elsevier GmbH 01-03-2021
• Subjects: Compact antenna; Low-profile; Substrate integrated waveguide; Transmission line; U-shaped slot; Low-profile; U-shaped slot; Transmission line; Substrate integrated waveguide; Compact antenna
• ISSN: 1434-8411; 1618-0399
• DOI: 10.1016/j.aeue.2020.153595

A compact open-ended substrate integrated waveguide (SIW) antenna based on composite right/left-handed transmission line (CRLH-TL) and unequal U-shaped slots for extended impedance bandwidth (IBW) and improved gain for Ku-band application is illustrated in this work. The proposed antenna comprises a CRLH-TL, which is composed of two inter-digital spiral-shaped capacitors placed on the top metal patch, which serves as series capacitor. Further, periodic metallic vias placed at the sidewalls, which act as shunt inductor for realizing the left-handed nature of CRLH-TL. To extend the antenna IBW performance, two unequal size U-shaped slots are placed at the middle of the antenna ground plane. By parametric analysis, these U-shaped slots lengths and widths are optimized to provide extended IBW ranging from 11.88 GHz to 14.05 GHz (16.74%). The antenna also offers a maximum gain of 6.1 dBi with bi-directional radiation performance, and radiation efficiency better than 96.1% is obtained throughout the complete antenna operating band. Hence the proposed SIW antenna is suitable for Ku-band applications.