Japan Radio Co., Ltd.

Keiichi Natsuhara

Kiyomi Okawa

Takeshi Oga

Katsuyoshi Ishida

Kazufumi Igarashi

Hiroshi Itoh

Kazuaki Yoshida

Yusuke Kato

Yuzo Shibuya

A two-port triplate-line/waveguide converter in one embodiment of this invention is provided with a rectangular waveguide and two probes that connect to central conductors of separate trip late lines via slits, said slits being formed separately on two opposing inside walls of the rectangular waveguide and lying on an imaginary straight line that is perpendicular to said inside walls. The two probes, the tips of which are bent inside the rectangular waveguide, constitute monopole antennas with the aforementioned inside walls functioning as the ground planes thereof.

Two-port triplate-line/waveguide converter having two probes with tips extending in different directions

A feed line in the form of a trip late line that runs from a waveguide/triplate-line converter coupled to a radio to a plurality of patch antennas in a cluster pattern. The width and length of a section of said feed line between the waveguide/triplate-line converter and the branch point nearest thereto are set such that the impedance of said section directly matches the parallel combination of the impedances of branches beyond said branch point and the loss in said section is kept to or below a predetermined upper limit.

Feed line comprised of a triplate line coupled between a waveguide/triplate line converter and patch antennas for optimizing signals through the feed line

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Tokyo, Japan

Keiichi Natsuhara