Abstract
A backward to forward scanning periodic microstrip leaky wave antenna (MLWA) is presented. The proposed antenna consists of a long rectangular patch with alternating shorting pin on each side, which connects the antenna patch and the ground plane to form periodic shorting circuits. There are two pairs of slots alternately spaced on the long patch to suppress the open stop band (OSB). The OSB problem was initially reduced by optimizing the structural parameters, and the slotting on the patch further improved it. The measured radiation pattern in the y-z plane shows that the antenna can scan electronically from 142° to 39° toward the end-fire (+z direction) when the operating frequency changes from 6 GHz to 12.9 GHz. The measured gain is greater than 5 dBi over the entire operating band.
Highlights
Forward scanning microstrip leaky wave antenna (MLWA) first appeared in 1979 [1]
A periodic MWLA is one in which there are multiple identical unit cells cascading along the propagation direction. e periodic structure is mainly composed of the following types of elements: strips, stubs, composite right/left handed [7], and slots [8]
open stop band (OSB) can be inhibited by optimizing structural parameters, such as optimizing the diameter of the cylindrical holes in the dielectric image line [13] and varying the groove width of the spoof plasmons cells [14]. ere are some techniques to achieve broadside direction scanning, such as loading field-block structures [15,16,17,18]
Summary
Forward scanning microstrip leaky wave antenna (MLWA) first appeared in 1979 [1]. Microstrip periodic leaky wave antenna with forward and backward beam scanning capability was developed later [2]. Periodic MLWAs have severe OSB problem at broadside. Ere are some techniques to achieve broadside direction scanning, such as loading field-block structures [15,16,17,18]. A periodic half-width MLWA with backward to forward beam scanning capability is proposed in [19]. A periodic MLWA, composed of a uniform rectangle microstrip patch leaky wave antenna with shorting pins periodically alternately loaded on its side, is presented. E last shorting pin in the right unit is canceled for connecting the load port on the end of the antenna. Simulated and measured results of far-field radiation patterns, S-parameters, and gain are displaced
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