Vehicular radio wave receiver and information displaying apparatus with radio wave receiver
First Claim
1. A vehicular radio wave receiver provided inside a vehicle that has a panel as a body of the vehicle and a window linked with the panel at an edge of the panel, comprising:
- a circuit board having a receiving circuit on a first surface of the circuit board and a ground pattern on a second surface that is opposite to the first surface; and
a dielectric antenna that has a shape of a pole and receives a signal to send the signal to the circuit board, wherein the circuit board is disposed close to the edge of the panel so that the ground pattern closely faces an inner surface of the panel, and the dielectric antenna is axially disposed along the window as extending from a peripheral portion of the circuit board close to the edge of the panel.
1 Assignment
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Accused Products
Abstract
A receiver includes a circuit board and a dielectric antenna. The circuit board has a receiving circuit on a first surface, and a ground pattern on a second surface. The circuit board is disposed close to a rear window of a vehicle so that the ground pattern faces a roof panel. The dielectric antenna extends from an edge of the circuit board toward and along the rear window. As a result, the roof panel capacitively couples with the ground pattern, so that the roof panel becomes imaginary ground. The dielectric antenna functions as a monopole antenna with the imaginary ground. It is not influenced with a metallic material of the vehicle.
16 Citations
10 Claims
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1. A vehicular radio wave receiver provided inside a vehicle that has a panel as a body of the vehicle and a window linked with the panel at an edge of the panel, comprising:
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a circuit board having a receiving circuit on a first surface of the circuit board and a ground pattern on a second surface that is opposite to the first surface; and
a dielectric antenna that has a shape of a pole and receives a signal to send the signal to the circuit board, wherein the circuit board is disposed close to the edge of the panel so that the ground pattern closely faces an inner surface of the panel, and the dielectric antenna is axially disposed along the window as extending from a peripheral portion of the circuit board close to the edge of the panel. - View Dependent Claims (2)
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3. A vehicular radio wave receiver provided inside a vehicle comprising:
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a circuit board having a receiving circuit and a ground pattern; and
a dielectric antenna that has a shape of a pole and receives a signal to send the signal to the circuit board, wherein at least one side of the circuit board in a lateral direction or a longitudinal direction has λ
/4 length, and the symbol λ
is a wavelength,the dielectric antenna is disposed as extending from a peripheral portion of the circuit board to an outside of the circuit board, and the ground pattern of the circuit board is an elongate form extended in a direction opposite to the dielectric antenna so that the dielectric antenna and the ground pattern function as elements of a dipole antenna.
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4. A vehicular radio wave receiver provided inside a vehicle having an inside rear view mirror, which is hanged from a roof or a windshield of an interior of the vehicle and holds a rectangular mirror in a housing of the inside rear view mirror, comprising:
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a circuit board having a receiving circuit and a ground pattern; and
a dielectric antenna that has a shape of a pole and receives a signal to send the signal to the circuit board, wherein the circuit board is housed in the housing of the inside rear view mirror with being combined with the rectangular mirror as a multilayer structure, the dielectric antenna is disposed as extending from a peripheral portion of the circuit board to an outside of the circuit board in a lateral direction of the circuit board, and the ground pattern of the circuit board is an elongate form extended in a direction opposite to the dielectric antenna so that the dielectric antenna and the ground pattern function as elements of a dipole antenna.
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5. An information displaying apparatus with a radio wave receiver comprising:
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a display displaying vehicular driving information;
a circuit board having a control circuit that controls the display; and
a radio wave receiver having a receiving circuit, a ground pattern, and a pole type dielectric antenna that receives a signal to send the signal to the receiving circuit, wherein the radio wave receiver is disposed at a peripheral portion of the circuit board, the dielectric antenna is disposed as extending in a certain direction, and the ground pattern of the radio wave receiver is an elongate form extended in a direction opposite to the dielectric antenna so that the dielectric antenna and the ground pattern function as elements of a dipole antenna. - View Dependent Claims (6, 7, 8, 9, 10)
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Specification