High Gain Wide Band Flexible Leaky Wave MIMO Antenna for AiP Applications

A four-port flexible Leaky Wave Antenna (LWA) is designed in the D-band to obtain a pencil beam radiation pattern with consistent gain and miniaturized size for Antenna in Package (AiP) applications. It is designed on a polyimide substrate with dielectric constant of 3.5, tangent loss of 0.006, and thickness of 10 μm. It consists of two rectangular patches fed through the Coplanar Waveguide (CPW) feeding technique. It also combines transverse and longitudinal slots on the rectangular patches to create circular polarization and improve the open stop-band issue of the LWAs. In addition, a matching element is utilized at each feeding, and then the feed line is cut by H-slots to improve the mutual coupling of the antenna. The proposed antenna offers a wide Bandwidth (BW) of 110- 135 GHz with small dimensions of 6 × 7 mm
²
. The main beam scans from −87° at 110 GHz to 0° at 130 GHz. The simulated peak gain of 14.8 dBic is obtained in an almost broadside direction at 115 GHz.