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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...
An 120GHz-band 16×16-slot array antenna fed with a corporate circuit has realized about 70% antenna efficiency including losses from 117GHz to 129GHz. 10Gbps data transmission with BER<10−12 is achieved with an effective transmission power of −14dBm at a distance of 1.4m. The antennas could be extended for sub-millimeter wave and THz bands.
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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