Abstract
In this paper, a theoretical model based on the electric field integration method is proposed to analyse radiation properties of the slotted annular Leaky-Wave Antenna (LWA), which can generate a Circularly Polarized (CP) conical beam or broadside beam. The annular LWA contains radiating elements arranged along a circular travelling-wave structure with equal intervals. By combining the proposed model and LWA theory, the design procedure for the annular SIW LWA is presented. To verify the model, three examples of LWAs with different beam angles have been designed and fabricated. Calculation results from the proposed model are consistent with the simulation and measurement results. The model can significantly reduce the design period and is an instructive tool for antenna design.
Highlights
Polarized (CP) conical beam antennas have been studied for a long time and attract increasing attention due to their low polarization mismatch loss, especially in satellite communication
In [5], a Circularly polarized (CP) conical beam is produced by simultaneously exciting the loop mode and monopole mode using a patch antenna, and it switches between right-hand CP and left-hand CP beams by PIN diodes
In [7], a CP conical beam antenna is proposed by a circularmonopolar patch surrounded with eight reconfigurable stubs, and the left- and right-hand CP are switched by PIN diodes
Summary
Polarized (CP) conical beam antennas have been studied for a long time and attract increasing attention due to their low polarization mismatch loss, especially in satellite communication. In [2], a patternreconfigurable antenna is proposed, which generates a broadside beam by the TM11 mode and a conical beam by exciting the TM21 mode Another type of methods is to simultaneously excite two orthogonal modes. In [12], a low-profile substrate integrated waveguide (SIW) antenna with a CP conical beam is designed by combining a radial current source and a loop current source In addition to these two types of methods, a CP conical beam can be generated by a CP array using CP radiation elements, e.g., in [13], orthogonal slots are notched on a metallic truncated circular cone to generate a CP conical beam pattern. In [17], a leaky-wave antenna with switchable omnidirectional conical radiation by frequency is proposed
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