Axially displaced elliptical reflector antenna design with a switchable feeder for ultra‐wide band applications

Abstract

This study presents a novel compact high gain dual reflector antenna design with a switchable feeder for ultra‐wide band (UWB) applications. The design comprises a main parabola, a replaceable feeder antenna that is chosen depending on the requirements in a given situation, and an axially displaced elliptical sub‐reflector. The functioning of two different feeder antennas with manual switching option, the partly dielectric loaded K‐Vivaldi and double‐ridged horn (RH), is discussed in this research study. When the K‐Vivaldi is employed, the dual reflector antenna is more appropriate for impulse radiation with 33:1 operational bandwidth, ranging from 600 MHz to 20 GHz. The double‐RH feeder antenna displays more efficiency than the K‐Vivaldi one; however, the bandwidth in this case goes down to 12:1, ranging from 1.6 to 20 GHz. The sub‐reflector, situated inside the main parabola aperture with onset type of feeders, reduces the depth of the structure to 16 cm. The antenna dimensions are 60 cm × 60 cm x 16 cm. Experiments have shown that the designed antennas display good efficiency and high gain performances in UWB operations.

A new phase efficiency calculation model for optimization of ahat‐fedreflector antenna with arbitrary radius of ring‐shaped phase center

“…where Gco 45 θ F ð Þ= j Gco 45 θ F ð Þje jϕ θ F ð Þ , and r(θ F ) describes the reflector as shown in Figure 1B. Combined with Equations (1), (2), (5), (6), (7) and 8, the new phase efficiency calculation model (denoted as Model II) can be constructed as:…”

“…The second method is widespread adoption in engineering applications because of simpler design approach. The displaced‐axis‐ellipse (ADE) reflector antennas which are one of ring‐focus reflector antennas were presented in Reference 6 and 7. Later, the modified self‐supporting ADE antenna were presented in Reference 6.…”