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The simulation of planar periodic leaky-wave antenna for ultra-wideband application is introduced here. The antenna proposed here comprises 15 matched unit cells with high directivity which provides a backward to forward beam scanning range of 80° with frequency from 24.4GHz to 27.5GHz and has filtering capability making the design simpler. The calculated efficiency is 90% which is the gain to the directivity ratio of the designed antenna. The bandwidth range is between 24.4 GHz to 27.5GHz. The work is outlined and assembled on Roger’s substrate (particularly good for 5G applications) and has a gain of 13.92dB which represents an excellent choice for communication systems.

In this study, a substrate‐integrated waveguide (SIW)‐based miniaturized leaky‐wave antenna (LWA) with fast beam scanning is proposed. The proposed LWA exhibits composite right/left‐handed (CRLH) property and its unit cell consist of an inverted Z‐shaped slot etched on the top layer of SIW. By sweeping frequency from 9.4 to 11.4 GHz, the proposed CRLH LWA can steer the frequency beam continuously from −40° to 51°, which shows fast beam scanning within the impedance bandwidth (2 GHz) of LWA. The good leakage constant contributes to the miniaturization of the LWA with electrical dimensions of 3.38λ0 × 0.34λ0 mm2. The antenna attains a peak gain of 12.5 dBi with maximum radiation efficiency of 92%. The antenna attains low sidelobe levels below 12 dB; the low sidelobe levels in the LWA are obtained by creating symmetricity in the unit cell around the centerline. The designed LWA is a viable contender for X‐band beam scanning applications.

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