Nippon Telegraph and Telephone Corporation

Mitsubishi Denki Kabushiki Kaisha

Nippon Telegraph and Telephone Public Corporation

Nippon Telegraph

Telephone Corporation

Kenichi Kagoshima

Kazuhiro Uehara

Moriyasu Miyazaki

Takashi Katagi

Koichi Tsunekawa

Makoto Matsunaga

Hideki Asao

Osami Ishida

Tamami Maruyama

Keizo Cho

Tomohiro Seki

Hitoshi Itakura

Kouichi Tsunekawa

Masahiro Karikomi

An antenna comprising the following members are provided: a first board-shaped dielectric material; a cylindrical member, provided on one face of the first board-shaped dielectric material, in which a part of a side wall may be cut off; plural second board-shaped members provided as radiating on the outer surface of the cylindrical member, one end face of each second board-shaped member being in contact with the surface of the first board-shaped dielectric material; and plural sets of plural pole members perpendicular to the surface of the first board-shaped dielectric material, made by forcing out corresponding portions of the first board-shaped dielectric material, the sets radiating from the outer surface of the cylindrical member and the plural pole members in each set being arranged in a line, and each set existing between two positional directions of the adjacent two second board-shaped members. The surface as one face of the first board-shaped dielectric material and the surfaces of each above member are coated with a conductive coating, by which the first board-shaped dielectric material, the cylindrical member, the second board-shaped members, and the pole members respectively function as a ground plane, a reflector, fins, and parasitic elements. A radiator is provided on an extension from each line on which a set of the parasitic elements on the ground plane exists and between the innermost parasitic element and the outer surface of the reflector.

Antenna and manufacturing method therefor

A small sized multi sector antenna having a plurality of sectors or element antennas each having related directivity in horizontal plane so that one of the element antennas is selected for providing desired beam direction has been found. Each of the element antennas is planar or in flat disc shaped, and is, for instance, a micro-strip antenna. Each of the element antennas is located in vertical plane, and each element antenna is positioned at different height from one another so that each element antenna does not overlap with other element antennas in vertical direction. A central vertical axis of the sector antenna is defined and the element antennas are positioned with axial symmetrical relations relating to said axis.

Multi sector antenna

In order to perform feeding to an inverted F antenna having a plate conductor of an approximately rectangular shape for forming a radiation conductor and a ground conductor arranged in parallel with the plate conductor, a strip conductor plate connected to a feeder line is provided on the ground conductor via a dielectric substrate. Hence, the feeding from the feeder line to the inverted F antenna 37 is performed by an electric field coupling of the plate conductor and the strip conductor plate. The inverted F antenna and a resonator are integrated by coupling means to carry out an impedance matching, and the inverted F antenna and the resonator 62 constitute a band pass filter.

Antenna device having a band pass filter

In order to perform feeding to an inverted F antenna having a plate conductor of an approximately rectangular shape for forming a radiation conductor and a ground conductor arranged in parallel with the place conductor, a strip conductor plate connected to a feeder line is provided on the ground conductor via a dielectric substrate. Hence, the feeding from the feeder line to the inverted F antenna 37 is performed by an electric field coupling of the plate conductor and the strip conductor plate. The inverted F antenna and a resonator are integrated by coupling means to carry out an impedance matching, and the inverted F antenna and the resonator 62 constitute a band pass filter.

Inverted F antenna with non-contact feeding

A transceiver used for a wireless in-building communication system has a housing which can be fitted with a luminaire having at least one lamp socket to which AC power supply voltage is supplied. At least one lamp base is projected from the housing and is capable of being engaged with the lamp socket so as to receive the AC power supply voltage from the luminaire. A member for radiating/receiving light or electromagnetic wave is disposed on a surface of the housing or in the housing. A power conversion circuit is disposed in the housing so as to convert the AC power supply voltage received via the lamp base into DC voltage having a predetermined voltage value. At least one transmit-receive circuit is disposed in the housing and is coupled with the radiating/receiving member so as to execute transmit-receive operation. The transmit-receive circuit is operated by the DC voltage supplied from the power conversion circuit.

Transceiver for wireless in-building communication sytem

A pair of bands are each secured at one end to one side of a case wherein a radio receiver is housed, and a monopole antenna having a length of 0.005.lambda. has one end connected to the feeding point of the radio receiver and its other end exposed to the outside of the case to form a contact portion for contact with the human body. A first helical antenna is supported to the one of the bands lengthwise thereof and is connected at one end to the feeding point. A second helical antenna is supported to the other band lengthwise thereof and is connected at one end to the common potential point of the radio receiver. The first and second helical antennas resonate, as one antenna, with the wavelength .lambda. used by the radio receiver, and their pitch P and helix area A are selected so that P&lt;500A/.lambda. and P&gt;150A/.lambda.. In an alternative embodiment first and second zigzag antennas are supported on said pair of bands respectively, and similarly connected to said feeding and common potential points instead of said helical antennas.

Wrist watch type receiver

A shaped offset-fed dual reflector antenna having a main reflector, a sub-reflector and a primary radiator which do not block the wave-path of said main reflector is improved by using an inclined primary radiator from a boresight axis of the antenna, and the shaped non-quadratic surface in said main reflector and/or said sub-reflector, to provide the desired aperture field distribution, improved cross-polarization characteristics, and improved side-lobe characteristics. The incline angle of the primary radiator is in the range between 10 degrees and 40 degrees. When a gregorian antenna is used, and the aperture field distribution is Tailor's -40 dB distribution, said incline angle is preferably 16 degrees.

Growing community of inventors

Kanagawa, Japan

Kenichi Kagoshima