Bandwidth enhancement of substrate integrated waveguide (SIW) slot antenna with center-fed techniques

Owing to many advantages of rectangular waveguide and microstrip lines, substrate integrated waveguide (SIW) can be used for the design of planar waveguide-like slot antenna. However, the bandwidth of this kind of antenna structure is limited because of its low profile and dielectric filling effect. In this work, center-feding technique is proposed to enhance the bandwidth of the slot antenna. To demonstrate the validity of the bandwidth enhancement technique, a linear slot antenna array with center-fed technique is proposed and implemented. The measured bandwidth of the fabricated antenna prototype is 9.8%, indicating about 145% bandwidth enhancement.