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An antenna system, where a single fed antenna with wide beam and a parasitic plate having homogeneous loops (HomLP) placed above it, is investigated to obtain a high-gain circularly polarized (CP) beam. The investigation shows that the system radiates a CP narrow beam in the broadside direction with a high gain of 15.3 dBi. In addition, a different antenna system, where the HomLP is replaced by an...
Two composite antennas are investigated as a triple-frequency element. First, a double-loop antenna with a C-figured loop is analyzed using the moment method. Secondly, on the basis of the radiation characteristics we analyze another double-loop antenna with two L-figured wires. It is found that the antenna has almost the same triple-frequency characteristics as those of the double-loop antenna with...
A two-arm spiral antenna excited in phase radiates a circularly polarized (CP) bidirectional beam. This bidirectional beam is transformed into a CP unidirectional beam using a conducting cavity as a reflector. The height of this cavity is chosen to be extremely small to realize a low-profile antenna: 0.077 wavelength at the lowest design frequency. The antenna characteristics, including the radiation...
The radiation efficiency for an Archimedean spiral (ARCS) antenna backed by a cavity is investigated, together with other antenna characteristics, where the antenna height is chosen to be extremely small (0.07 wavelength at the lowest analysis frequency of 3 GHz) in order to realize an extremely low-profile antenna. Deterioration in the axial ration and input impedance due to the close proximity of...
We demonstrate a carrier-envelope-offset (CEO)-locked frequency comb with 230-pJ fiber coupling pulse energy by using a passive-modelocked Er-fiber amplifier laser. We succeeded in CEO stabilization at telecommunications wavelengths using the lowest fiber coupling pulse energy.
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