Hitachi Chemical Company, Ltd.

Keisuke Iijima

Masahiko Oota

Hisayoshi Mizugaki

Takashi Saitou

Masaya Kirihara

Yuichi Shimayama

Taketo Nomura

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

Chikusei, Japan

Keisuke Iijima