Yokowo Co., Ltd.

Ube Industries, Inc.

JunXiang Ge

Wasuke Yanagisawa

Ryo Horie

Shozaburo Kameda

Hiroshi Ichikawa

Provided is a wide band antenna having ultra-wide band and high performance at a low cost. An antenna element constituting a part of an opening cross section structure of a double cylinder ridge waveguide is spread on a plane. The antenna element has a ridge element portion () for adjusting antenna characteristic corresponding to a ridge portion and a radiation element portion () for electromagnetic wave radiation. Substantially at a leading end portion of the ridge element portion (), a feeder terminal () is formed. Ground portions (and) are maintained at a ground potential and the feeder terminal () is guided to an outside as a coplanar waveguide.

Broad band antenna

To provide a smaller radar system having a simple structure with as small number of component parts as possible at a lower cost as compared to conventional ones. A radar systemincluding a 3 dB couplerhaving four terminals, and a pulse generator. A first terminalof the 3 dB coupleris supplied with an output signal from a high frequency oscillatorwhile a second terminalof the 3 dB coupleris connected to a transmitting and receiving antenna. Third and fourth terminalsandof the 3 dB couplerare connected to two-state devices, respectively, which are in impedance mismatched only for a predetermined period of time to totally reflect the signal from the 3 dB couplerand are in impedance matched during the time period other than the predetermined time to direct a signal from the 3 dB couplerto a subsequent electronic circuit. The pulse generatorcauses the two-state devicesto be impedance mismatched at the time of transmission and causes the two-state devicesto be impedance matched at the time of reception.

Radar system

There is provided a low-cost wide band antenna having an ultra-wide band and high performance. The wide band antenna includes an antenna element to form a shape of a ridge waveguide open cross-section structure together with GND () when it is spread. The antenna element has a ridge element portion () corresponding to the ridge portion of the ridge waveguide and a radiation element portion () corresponding to the wall of the ridge waveguide and extending from the ridge element portion () for electromagnetic wave radiation. Moreover, the antenna element has an opposing auxiliary element () having the same shape and structure as the ridge element portion (). The radiation element portion () has an end arranged on the GND (). The ridge element portion () has a tip end connected to a power supply terminal ().

Wide band antenna

An antenna elementis formed such that a plurality of turning partsare formed by being turned back in zigzag in parallel to a ground conductor filmwhile extending perpendicularly thereto and the lengths of segmentsbetween the turning parts are shorter on a side of the ground conductor film(a side of a feeding part) and increase gradually as the segments are away from the ground conductor film. The turning parts of the antenna elementare formed such that the antenna resonates at two or more frequency bands, and has a fractional bandwidth of 4% or more of its frequency in a first frequency band and a fractional bandwidth of 15% or more of its frequency in a second frequency band by adjusting the lengths L, Land Lof respective segments and the intervals d, dand dbetween adjacent segments. Consequently, a wideband antenna is realized in two or more multi-frequency bands, for example 2.4 to 2.5 GHz and 5 to 6 GHz, by using a single folded antenna.

Folded antenna

A laminated dielectric block () is formed by laminating dielectric sheets () each having a conductive film formed on its one surface so as to constitute at least one filter (). A radiation element () is provided so as to fix to the laminating dielectric block, wherein one electrode of the filter is electrically connected to the radiation element. The other electrode () of the filter is connected to a feeding terminal electrode () provided mounting face B (a face opposing to a circuit board) of the laminated dielectric block through a via-contact () and a wiring (), not being exposed to the side face. As a result, an antenna with built-in filter of the structure where even if it is mounted on a circuit board, interference between an electronic circuit on the circuit board and the feeding terminal electrode of the antenna is prevented to improve the isolation characteristic and transmitting or receiving characteristic.

Antenna with built-in filter

A ground conductor plane and an excitation electrode are provided substantially in parallel with each other. Two electrodes and for respectively radiating a linearly-polarized wave are provided substantially in parallel with the ground conductor plane , with the excitation electrode interposed therebetween. The radiation electrodes are provides in close proximity to the excitation electrode such that one end of each of the radiation electrodes and establishes capacitive coupling with respect to the excitation electrode . The other ends of each of the radiation electrodes and are grounded such that the directions in which electric fields are to be excited becomes substantially orthogonal to each other. For instance, a feeding section is provided in flush with the ground conductor plane and is electrically connected to the excitation electrode via a feeding electrode

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Tokyo, Japan

JunXiang Ge