Abstract
This paper proposes a technique to enhance the bandwidth and gain of an endfire radiating open-ended waveguide using a thin slow-wave surface plasmon structure. Mounted in the E-plane of the stated waveguide, a thin corrugated slow-wave structure has been used in conjunction with a waveguide transition to generate an endfire electromagnetic beam. An efficient mode conversion from waveguide transition to the corrugate plate resulted in the improved performance of the design. An impedance bandwidth from 8 GHz to 18 GHz has been achieved along with a gain enhancement from 7 dBi to 14.8 dBi using the proposed hybrid design. Endfire radiations have been obtained with a beam width of less than 25° through the proposed hybrid design with an efficiency of about 96 percent.
Highlights
Rectangular waveguides have been in use for many decades for a range of communication applications
The effective exploitation of these features require a reliable evaluation of the important parameters of spoof surface plasmon (SSP)-based transmission lines (TLs)
This paper focuses on a slow wave endfire antenna having a group velocity Vg 6 c
Summary
Rectangular waveguides have been in use for many decades for a range of communication applications. A leaky mode propagates along the guiding body of the antenna with a group velocity greater than the speed of light, radiating electromagnetic energy in all directions other than the endfire direction. Slow wave antennas as well as other devices supporting propagation of an electromagnetic wave with a group velocity equal to the speed of light, i.e., Vg = c, are known to be able to generate an endfire radiation [1,2,3,4,5,6,7]. Open-ended waveguides have been commercially marketed as a directional antenna for terahertz These components are rarely used in microwave or millimeter wave frequencies in part because of their low gain and limited bandwidth. Transition from waveguide to the proposed spoof surface plasmon design, have been achieved
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