| US 7,561,112 B2 | ||
| Composite antenna device | ||
| Motohiko Sako, Osaka (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Appl. No. 10/574,596 PCT Filed Jul. 28, 2005, PCT No. PCT/JP2005/014243 § 371(c)(1), (2), (4) Date Apr. 05, 2006, PCT Pub. No. WO2006/011659, PCT Pub. Date Feb. 02, 2006. |
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| Claims priority of application No. 2004-221330 (JP), filed on Jul. 29, 2004. | ||
| Prior Publication US 2007/0024513 A1, Feb. 01, 2007 | ||
| Int. Cl. H01Q 21/00 (2006.01); H01Q 1/00 (2006.01); H01Q 1/24 (2006.01) | ||
| U.S. Cl. 343—727 [343/730; 343/702] | 3 Claims |
| 1. A composite antenna device comprising:
a ground board;
an unbalanced antenna including
a first feeding point electrically coupled with the ground board,
a first radiator having a first end and a second end, the first end of the first radiator being connected with the first feeding
point, and
a load conductor having a first end, a second end, and a connection point where the load conductor is connected with the second
end of the first radiator, the load conductor intersects a straight line which also passes through the first feeding point
and which is perpendicular to the ground board;
a balanced antenna including
a second feeding point electrically isolated from the first feeding point,
a second radiator connected with the second feeding point, and
a third radiator connected with the second feeding point,
wherein the load conductor of the unbalanced antenna includes a first portion and a second portion, the first portion of the
load conductor being provided between the first end of the load conductor and the connection point, the second portion being
provided between the second end of the load conductor and the connection point, and
wherein an impedance Z11 of the first portion of the load conductor, a mutual impedance Z12 of the second radiator to the first portion of the load conductor, a mutual impedance Z21 of the first portion of the load conductor to the second radiator, an impedance Z22 of the second radiator, an impedance Z33 of the second portion of the load conductor, a mutual impedance Z34 of the third radiator to the second portion of the load conductor, a mutual impedance Z43 of the second portion of the load conductor to the third radiator, and an impedance Z44 of the third radiator satisfy the relation of
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