Hitachi Chemical Company, Ltd.

Hitachi Chemical, Ltd.

Masahiko Oota

Takashi Saitou

Hisayoshi Mizugaki

Taketo Nomura

Keisuke Iijima

Masaya Kirihara

Yuichi Shimayama

Hironori Ishizaka

Kouji Tasaki

Yuuichi Shimayama

Toshihiro Endou

Hiroyuki Hosoi

Jo Kakuta

Hiroaki Narita

Hiroki Sato

Provided is an RFID tag, wherein a communication distance of several centimeter or more can be secured and the cost of which can be reduced in comparison to conventional on-chip antennas, even when being compact in size (square shaped with a side of 1.9 to 13 mm). The RFID tag () comprises an antenna (), an IC chip () connected to the antenna (), and a sealing material () that seals the IC chip () and the antenna (). The antenna () is a coil antenna or a loop antenna, and the resonance frequency (f) of an electric circuit constituted by the inductance (L) of the antenna () and the capacitance (C) of the IC chip () is equal to the operation frequency of the IC chip (), or in the vicinity thereof.

RFID tag

Provided is a multi-beam antenna device capable of achieving two independent multi-beam characteristics using a single antenna unit, and enhanced gain. The multi-beam antenna device comprises a first antenna section, a second antenna section, a first Rotman lens section and a second Rotman lens section, which are laminated together in this order to form a planar antenna module. A first multi-beam characteristic is achieved by the first antenna section and the first Rotman lens section, and a second multi-beam characteristic is achieved by the second antenna section and the second Rotman lens section, independently. A Rotman lens in each of the Rotman lens sections is designed such that: &#x3b2; with respect to &#x3b1; is set to satisfy the following relation: &#x3b2;&#x3c;&#x3b1;, where &#x3b2; is a spatial beam-forming angle of an array antenna, and &#x3b1; is an elevation angle between a center line (), and a line segment which connects one of an input port and an intersecting point S; and a shape of a Rotman lens is set to satisfy the following relation: &#x3b7;=(&#x3b2;/&#x3b1;)&#xb7;(Ln/F)&#x3c;1, and reduce G to less than a basic value of G when designed under a defined condition of &#x3b2;=&#x3b1;, where: F is a distance between the input port and S; G is a size of the Rotman lens; and 2 Ln is the aperture length of an array antenna.

Multi-beam antenna device

A multi-beam antenna suppressing an increase in loss of a Rotman lens to achieve enhanced gain. &#x3b2;&#x3c;&#x3b1;, where: &#x3b2; is a spatial beam-forming angle of an array antenna viewed from the a front of the antenna; and &#x3b1; is an angle between a center line of a Rotman lens, and a line segment connecting one of the input ports and an intersecting point Sof the center line with a curve segment having a plurality of output ports A shape of the Rotman lens such that: &#x3b7;=(&#x3b2;/&#x3b1;)(Ln/F)&#x3c;1, and G is less than when &#x3b2;=&#x3b1;, where: F is a distance between one input port and S; 2 Ln is an aperture length of the array antenna; and G is a size of the Rotman lens, defined as a distance between Sand an intersecting point of the center line with a curve segment having input ports.

A triplate line inter-layer connector and a planar array antenna are provided. The triplate line inter-layer connector has an electrical connection structure between a first triplate line and a second triplate line, a first patch pattern formed at a connection-side terminal end of a first feeder line, a first feed substrate having a first shield spacer disposed therebeneath, and a second shield spacer disposed thereabove. Each of the first and second shield spacers has a hollow portion hollowed out to a size encompassing the first feeder line and the first patch pattern so as to define a corresponding one of first and second dielectrics. A second feeder line is provided on a second feed substrate together with a second patch pattern, and a second ground conductor has a first slit formed in a portion thereof located approximately intermediate between the first and second patch patterns.

Triplate line inter-layer connector, and planar array antenna

A planar antenna module according to one preferred embodiment of the present invention comprises an antenna portion (), a feeder portion (), and a connection plate (). The antenna portion () includes a first ground plate () having a first slot (), a second ground plate () having dielectrics, an antenna substrate having a radiation element (), a third ground plate () having dielectrics, a fourth ground plate (). The feeder portion () includes the fourth ground plate (), a fifth ground plate (), a feed substrate (), a sixth ground plate (), a seventh ground plate (). The connection plate () has a second waveguide opening portion (). The connection plate () to be connected with a high frequency circuit, the seventh ground plate (), the sixth ground plate (), the feed substrate (), the fifth ground plate (), the fourth ground plate (), the third ground plate () including the third dielectric () and the fourth dielectric (), the antenna substrate (), the second ground plate () including the first dielectric () and the second dielectric (), and the first ground plate () are stacked in this order.

Triple plate feeder&#x2014;waveguide converter having a square resonance patch pattern

A ground conductor () has a through hole provided through an area thereof for connection with a waveguide (), with dimensions substantially equal to cavity dimensions of the waveguide (), and a metallic spacer () is provided as a holding element for a film substrate (), with an even thickness to a dielectric substrate (), the metallic spacer () having dimensions Eand Eof cavity walls thereof changed in accordance with a desirable frequency, and cooperating with another metallic spacer () having substantially equal dimensions to the metallic spacer (), to sandwich the film substrate () in between, and in addition, an upper ground conductor () is arranged on the other metallic spacer (), and a quadrate resonant patch pattern () is formed at an end of the strip line conductor () formed to the film subs ate (), on an area corresponding to a transducer end of the waveguide (), while a combination of the quadrate resonant patch pattern () and the waveguide () is arranged such that the quadrate resonant patch pattern () has a center position thereof coincident with a center position of the cavity dimensions of the waveguide ().

Triplate line-to-waveguide transducer having spacer dimensions which are larger than waveguide dimensions

The present invention provides inexpensively a planar antenna module that is able to realize a loss reduction, a reduction in characteristic variation caused by an assembling error, and an improved stability in frequency characteristics. A planar antenna module according to one preferred embodiment of the present invention comprises an antenna portion (), a feeder portion (), and a connection plate (). The antenna portion () includes a first ground plate () having a first slot (), a second ground plate () having dielectrics, an antenna substrate having a radiation element (), a third ground plate () having dielectrics, a fourth ground plate (). The feeder portion () includes the fourth ground plate (), a fifth ground plate (), a feed substrate (), a sixth ground plate (), a seventh ground plate (). The connection plate () has a second waveguide opening portion (). The connection plate () to be connected with a high frequency circuit, the seventh ground plate (), the sixth ground plate (), the feed substrate (), the fifth ground plate (), the fourth ground plate (), the third ground plate () including the third dielectric () and the fourth dielectric (), the antenna substrate (), the second ground plate () including the first dielectric () and the second dielectric (), and the first ground plate () are stacked in this order.

Growing community of inventors

Oyama, Japan

Masahiko Oota