ANTENNA UNIT AND SIGNAL SWITCHING CIRCUIT

WIPO Patent Application WO1999009610

A8

An antenna unit which can always receive radio waves in an excellent receiving state and a signal switching circuit used for the unit. The antenna unit is prepared by placing in the same case a first antenna element which receives radio waves broadcast from a satellite station, a second antenna element which receives radio waves broadcast from a ground station in the VHF band, and a switching means for selecting either the output of the signal received by the first antenna element or the output of the signal received by the second antenna element in accordance with a DC bias level supplied from a reception unit through a signal supplying cable and supplying the output thus selected to the reception unit through the signal supplying cable.

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NORO JUNICHI (JP)
MONMA NOBUAKI (JP)
AWA HIROKAZU (JP)
TAMURA NOBUO (JP)
SAITO TAKESHI (JP)

PCT/JP1998/003600

October 21, 1999

August 12, 1998

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MITSUMI ELECTRIC CO LTD (JP)
NORO JUNICHI (JP)
MONMA NOBUAKI (JP)
AWA HIROKAZU (JP)
TAMURA NOBUO (JP)
SAITO TAKESHI (JP)

H01Q1/38; H01Q3/24; H01Q5/00; H01Q9/04; H01Q21/30; H01Q23/00; H04B7/08; H04B7/10; (IPC1-7): H01Q23/00; H01Q21/24; H04B7/08; H01Q3/24

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