A Loop-Line Antenna with Wideband Circular Polarization

A Loop-Line Antenna with Enhanced Bandwidth of Circular Polarization

“…A recent study using a loop element has shown that the CP wave bandwidth of a line antenna can be increased [7].…”

“…is paper is an extended version of the preliminary conference one [7] written by the present authors. e study of the isolated loop element is newly focused on the reason why the wideband CP radiation is obtained.…”

“…e study of the isolated loop element is newly focused on the reason why the wideband CP radiation is obtained. For this, a more in-depth analysis than the preliminary one [7] is performed in Section 3 using the method of moments [8]. Even in Section 2 showing a need for selection of loop height above the ground plane, we add new results (shown with dotted lines in Figures 1 and 2), which play an important role of finding a condition for wideband CP radiation in Section 3.…”

“…In Section 4, we replace all the simulated results of the line antenna in [7] with new ones that can be validated by experimental work.…”

“…is is based on an evolution of the antenna design, by which input impedance matching a 50-Ω coaxial line is realized without deterioration in the CP radiation. Note that there have been only simulated results in [7], since the input impedance that satisfies a VSWR of less than 2 has yet to be researched. Figure 3 shows a loop antenna located at height h above a ground plane.…”