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A radial line slot antenna (RLSA) is a kind of slotted waveguide array for DBS reception [1][2]. It is free of conductor loss and the aperture efficiency is more than 75%, twice as high as conventional planar antennas [3]. Those performances have been realized for double-layered RLSAs with uniform slot length.
Shortened far-field gain measurement method had been proposed for one of gain measurement methods that does not require replacement of antennas and measurement of distance between antennas. In this study, the shortened far-field gain measurement method was investigated by the simulation of a patch antenna in 2.5 GHz band. Because this antenna is narrow bandwidth and measured distance is relatively...
Shortened far-field gain measurement was performed for pyramidal horn antennas with gain of 18.7 dBi at 10 GHz in measurement. Identical two horn antennas were used as transmitter and receiver. A standing wave, which cause degradation of accuracy, was observed due to multiple reflections between the two horn antennas. Averaging technique was evaluated to enhance the accuracy of gain measurement, and...
A new antenna gain measurement technique is proposed. In the proposed technique, far-field two antenna gain measurement is performed with two sets of distances. The information required in the technique is the difference of distances and received power. To confirm the validity of the proposed technique, a numerical simulation was performed for a half-wavelength dipole antenna. An isotropic antenna...
In this study, errors in shortened far-field gain measurement caused by mutual coupling were investigated. In addition, an averaging technique was evaluated to enhance the accuracy of gain measurement. Numerical simulation of an analysis model comprising two half-wavelength dipole antennas was performed for verification. Discrepancies were observed in the calculated distance and gain because of mutual...
We design and fabricate a double-layer slotted waveguide array antenna having a wide bandwidth and a high efficiency for 120 GHz band and 350 GHz band using diffusion bonding of laminated thin metal plates. The fabricated 120GHz-band antennas are measured in two types of systems to examine the performance. The firstly fabricated antenna shows about 65% efficiency with 31.5 dBi gain around the design...
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