Abstract
A periodic microstrip leaky wave antenna (MLWA) constructed of non-uniform aspect ratios microstrip patch periods is presented in this communication. Effective equations and simulations for the relevant antennas are used to obtain the propagation constants of the proposed antenna and design it. However, due to the presence of an open stop-band (OSB) in the broadside direction, double-side parallel-strip lines are then introduced in the antenna design. Truncating and interlacing the unit cells are developed to make them become impedance matched structures with the elimination of the OSB and the improvement of the radiation patterns. As a result, a new antenna configuration is created, and a prototype of the antenna is fabricated and measured. Continuous main beam scanning is observed from back-firing to end-firing with the operating frequency band of 4.8–18 GHz. Excellent agreements between the predicted and measured results are obtained. The measured peak gain of the prototype is 14 dBi, and the gain exceeds 6 dBi over the frequency band.
Highlights
A S A CLASSICAL planar antenna, the microstrip leaky wave antenna (MLWA) has attracted extensive investigation attention since being introduced by W
MLWA has played a significant role in microwave or millimeter-wave projects owing to its advantages of low profile, simple structure and easy to match [2]
In a previous study of our laboratory, we proposed a backfire-to-end-fire beam scanning periodic offset MLWA based on double-side parallel-strip lines (DSPSL) [17]; its scan range realize 180◦ but its operating frequency band exists two open stop-bands (OSBs), which is the most similar
Summary
A S A CLASSICAL planar antenna, the microstrip leaky wave antenna (MLWA) has attracted extensive investigation attention since being introduced by W. One method to obtain this capability is to apply composite right/left-handed (CRLH) metamaterial in the antenna design [8] (e.g., leaky wave antenna (LWA) substrate-integrated waveguide (SIW)-based employing the transmission lines (TLs) with CRLH metamaterial [9], consistent-gain CRLH LWA with design flexibility [10], and 2-D CRLH LWA frequency scanning array with size reduction and beam steering control simplification [11]). Another approach to reduce the limitation of the scanning range is to apply periodic structure in the LWA [12], [13].
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