Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Genichiro Ota

Daichi Imamura

Mitsuru Uesugi

Yutaka Saito

Keiji Takakusaki

Hiroshi Haruki

Hiroyuki Uno

A modulation apparatus is disclosed that enables significant improvements in signal transmission rate in a limited frequency band as compared with conventional modulation schemes. The modulation apparatus has first and second frequency-increasing single side band (SSB) modulators. The modulators are configured to have respective carrier frequencies with a difference by a frequency corresponding to the symbol frequency (i.e. fundamental frequency of the input symbol). An adder combines a lower side band (LSB) signal obtained from the SSB modulator set for a higher carrier frequency, and an upper side band (USB) signal obtained from the SSB modulator set for a lower carrier frequency to obtain a modulation signal.

Modulation device, demodulation device, modulation method and demodulation method

Linear elementstoare conductors, which have the element length equivalent to half a wavelength, have been placed so that they may draw a diamond shape. Delay elementsandare bent conductors, which have a total length equivalent to one fourth wavelength and a length Lequivalent to one eighth. The linear elementsandare connected one another via the delay element, while the linear elementsandare connected one another via the delay element. A feeding sectionis connected to each of the ends of the linear elementsandfor feeding power to them. Between the tips of the linear elementsand, a gap with a length Lis left. A reflectorhas been placed at a distance h from a diamond-shape antenna with delay elements along the &#x2212;Z axis, the distance h being equivalent to 0.42 wavelength. This achieves the antenna device, which may be suitably mounted on any of small wireless apparatuses and form a primary beam, of which horizontally-polarized wave or vertically-polarized wave tilts toward the horizontal direction.

Antenna device

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Miura, Japan

Genichiro Ota