Abstract
In this communication, an endfire antenna array using series-fed cavity-backed slot elements is proposed with low profile and high gain properties. By adopting the cavity-backed slot element as the radiating element, the antenna array can be partly embedded under the ground plane, which reduces the profile. Fed by an air–substrate microstrip line, the antenna array achieves a moderate phase constant, which leads to an endfire radiation pattern. By optimizing the coupling level between the cavity-backed slot elements and microstrip line, the aperture distribution of the antenna array is improved to enhance the endfire gain. With the overall length of 3.75 wavelength at 4 GHz, the proposed antenna array obtains a measured endfire gain of 11.5 dBi. Compared with the low-profile endfire antennas mounted on the metallic plane, the proposed antenna array has lower profile and higher endfire gain.
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