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Using the method of moments, we analyze two types of microstrip-line antennas. They are connected and penetrated loop-line antennas, each consisting of loops and straight lines. It is found that circularly polarized radiation is obtained when the straight lines are appropriately shifted with respect to the loop centers.
A loop antenna having a gap has been investigated in the presence of a ground plane. The antenna configuration is optimized for the CP radiation, using the method of moments. It is found that, as the loop height above the ground plane is reduced, the optimized gap width approaches zero. Further antenna height reduction is found to be possible for an antenna whose wire radius is increased. On the basis...
A circularly polarized (CP) radiation beam has been scanned using an array antenna with many radiation elements. In this paper, a single radiation element whose CP beam can be scanned is proposed. The radiation element is composed of a patch and its frame, each being excited by a coaxial line. The patch and frame are excited with the same amplitude and phase, and the radiation characteristics are...
This paper presents a small antenna system that realizes a scanning beam. The antenna system is composed of one fed patch element (into which a ring slot is cut), four parasitic bent Y elements, and four parasitic inverted L-shaped elements. These elements are all backed by a ground plane. It is emphasized that the center-to-center spacing between the fed patch and the parasitic bent Y elements is...
This paper presents an array composed of four SIFAs (strip inverted F antennas) located above a finite-sized square EBG reflector consisting of N2 mushroom-like patch elements. Analysis reveals that, when a voltage source is applied to terminal F-x and the remaining terminals (F+x, F+y , F-y) are left open-circuited, the EBG-SIFA array radiates a beam tilted in the negative x-direction. It is also...
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