| US 7,557,766 B2 | ||
| Portable remote controller for tire status detector | ||
| Shinichi Kawase, Ichinomiya (Japan); Takashi Takeyama, Ichinomiya (Japan); and Syuji Aoyama, Kani (Japan) | ||
| Assigned to Pacific Industrial Co., Ltd., Ogaki (Japan) | ||
| Filed on Mar. 03, 2008, as Appl. No. 12/73,256. | ||
| Claims priority of application No. 2007-248674 (JP), filed on Sep. 26, 2007. | ||
| Prior Publication US 2009/0079652 A1, Mar. 26, 2009 | ||
| Int. Cl. H01Q 7/08 (2006.01) | ||
| U.S. Cl. 343—788 [343/850; 340/447] | 12 Claims |
| 1. A portable remote controller for a tire status detector, which transmits a long wave signal with a first frequency to the
tire status detector mounted on a wheel so that air pressure of a tire is detected, and which receives an ultra high frequency
signal with a second frequency from the tire status detector, thereby displaying a result of detection of the tire air pressure
contained in the ultra high frequency signal, the portable remote controller comprising:
a portable casing;
a transmission circuit provided in the casing and having an output side;
a low-pass filter provided at the output side of the transmission circuit for permitting only a signal with a frequency of
not more than the first frequency to pass therethrough;
a receiving circuit provided in the casing and having an input side;
a high-pass filter provided at the input side of the receiving circuit for permitting only a signal with a frequency of not
less than the second frequency to pass therethrough;
a ferrite bar antenna housed in the casing and having a ferrite bar wound with an antenna coil, the antenna coil having two
terminals, one of which being connected to the ground and the other being connected in common to the low-pass and high-pass
filers; and
a duplexer composed of the low-pass and high-pass filters, wherein the ferrite bar antenna is used both for transmission of
the long wave signals and for receipt of the ultra high frequency signals.
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