Analysis of elliptical and circular microstrip antennas using moment method

Wideband planar array antenna based on SCRLH-TL for airborne synthetic aperture radar application

“…In [22] it has been shown that a single feed-line can be used to excite CP radiation in a circular patch. In fact, the radiation can be made to be either lefthanded or right-handed circularly polarized (LHCP/RHCP) depending on the feed point to the antenna element [23].…”

Circularly Polarized Microstrip Antennas with Proximity Coupled Feed for Circularly Polarized Synthetic Aperture Radar

“…Slightly elliptical patch can have a circular polarization radiation with a single feeding (Bailey et al 1985, Shen 1981). In addition, an elliptical antenna element generally has an elliptically polarized radiation, but it has left-handed (or right-handed) circularly polarized (LHCP/RHCP) radiation when the feed point of the antenna element is located on the radial line rotated 45 o counterclockwise (or clockwise) to the semi major-axis of the ellipse (Bailey et al, 1985). Also according to Bailey et al (1985), the best circular polarization radiation may be achieved by limiting the eccentricity of the ellipse to a range of 10 to 20%.…”

“…In addition, an elliptical antenna element generally has an elliptically polarized radiation, but it has left-handed (or right-handed) circularly polarized (LHCP/RHCP) radiation when the feed point of the antenna element is located on the radial line rotated 45 o counterclockwise (or clockwise) to the semi major-axis of the ellipse (Bailey et al, 1985). Also according to Bailey et al (1985), the best circular polarization radiation may be achieved by limiting the eccentricity of the ellipse to a range of 10 to 20%. The configuration of the radiating element together with the microstrip line feed and ground plane is shown in Figure 11(a), where important parameters are labeled.…”

“…The configuration of the radiating element together with the microstrip line feed and ground plane is shown in Figure 11(a), where important parameters are labeled. Although prior elliptical patch were based on the probe-feed method (Bailey et al 1985, Shen 1981, in this chapter we adopt the proximity-coupled feeding method (Pozar et al, 1987). This approach has the advantage of easier adjustment in the process of design and fabrication processes, especially in producing good circular polarization with good impedance matching.…”

Accurate Synthesis Model for Microstrip Antennas with Automatic Choice of the Shape Versus Physical and Geometrical Criteria

“…We show in figure 1 and figure 2-the different studied structures. An air-gap enables to obtain exactly the resonant impressed frequency (1-2), the dielectric cover can offer protection against environmental hazards (ice, snow for example) (3)(4)(5)(6), the ring microstrip antenna can be proposed for dual band operation (7)(8)(9), and the eccentricity of the elliptical antenna allows us to obtain a wider frequency band and the desired resonant frequency (10)(11)(12).…”