Morihiko Ikegaya

Small and thin structure plate type wideband antenna (3 GHz - 6 GHz) for wireless communications

The wideband antenna that we developed has a small and thin structure (W 41 /spl times/ H 34 /spl times/ t 0.3 mm); and it is suitable to be installed in small spaces. This antenna has a resonance frequency from 3 GHz to 6 GHz, where VSWR was below 2.0. The radiation pattern is omnidirectional and the average gain curve is almost flat over this frequency range, and the values were around 0 dBi. The group delay is almost flat and its perturbation is within 1 ns over the above frequency range.

Auto Search Algorithm for Antenna Structure by Gradient Method Combined with Method of Moment

We propose a novel antenna design method consisting of the gradient method and method of moment is proposed. An antenna structure is represented by the combination of small segments. By regarding the 0/1 state segment variable as a real parameter, a matrix equation for the gradient method is derived. Fast computation causing of automatic decisions of simultaneous changing segments achieves practical design for various antennas, including large-scale antennas.