Abstract
In order to facilitate the integration of active devices, a leaky-wave antenna (LWA) based on corrugated substrate integrated waveguide (CSIW) structure is proposed. By introducing rectangular ring slots on the CSIW structure, the proposed LWA is capable of beam scanning from backward to forward. The rectangular ring slots do not only enable energy leaking but also provide series capacitance. In addition, the grounded vias and quarter-wave open-circuit stubs provide shunt inductance. Thus, the proposed CSIW exhibits left-handed characteristic which enables beam scanning through the broadside. To further facilitate the design and suppress open-stopband of beam scanning antenna based on CSIW structure, an equivalent circuit model is developed and the relationships between structure parameters and the equivalent circuit parameters are presented. Based on this design guide, a leaky wave antenna is designed with radiation angle ranging from −53° to 23°. This proposed novel CSIW LWA has great potential in tunable or reconfigurable antenna design due to its ease of integration with active devices.
Highlights
Leaky-wave antenna is widely used in wireless communication systems in recent years, due to their low-profile, high directivity, and frequency-scanning capability [1]
This limitation was removed by designing leaky-wave antenna (LWA) based on composite right/lefthanded (CRLH) transmission line [2], which can support continuous beam scanning from backward to forward
The emerging of corrugated substrate integrated waveguide (SIW) (CSIW) exhibits great potentials in integrating with active circuits
Summary
Leaky-wave antenna is widely used in wireless communication systems in recent years, due to their low-profile, high directivity, and frequency-scanning capability [1]. The rectangular waveguide based LWAs can provide high gain, but the beam scanning from forward to backward direction suffered a prohibition at the boresight due to the open-stopband. To realize beam scanning from backward to forward, SIW LWAs were designed by periodically loading of transversal and longitudinal slots [7], interdigital slots [8, 9]. It is challenging for the conventional SIW structure to be integrated with the active device. A method for designing LWA capable of beam scanning from backward to forward base on CSIW.
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