Electronic circuit device
First Claim
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1. The electronic circuit device comprising:
- a printed circuit board having a first surface on which a circuit pattern is formed and a second surface on which a ground plane is formed, a coupling stub being formed in a plane of said ground plane, said coupling stub being electrically isolated from said ground plane and electrically connected to said circuit pattern by an electrical conductor extending through said printed circuit board, and components including a modulating element mounted on said first surface of said printed circuit board and electrically connected to said circuit pattern;
a plane antenna having an antenna element, formed on a first surface of a dielectric substrate,said printed circuit board and said plane antenna being attached to each other such that the second surface of said printed circuit board and a second surface of said dielectric substrate are juxtaposed to each other and said coupling stub is electromagnetically coupled to said antenna element; and
signal modulating means for producing a modulated signal by modulating a non-modulated signal received by said antenna element, said non-modulated signal being electromagnetically coupled from said antenna element to said coupling stub and inputted from said coupling stub to said modulating element, said modulated signal being outputted from said modulating element to said coupling stub and electromagnetically coupled from said coupling stub to said antenna element, said signal modulating means includes means for changing a capacitance of said modulating element and a signal generating integrated circuit driven by a battery, said modulating element being operatively connected to said signal generating integrated circuit so as to receive a code output from said signal generating integrated circuit and to modulate said non-modulated signal according to said code output.
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Abstract
An electronic circuit device comprises a printed circuit board having a first surface on which a circuit pattern is formed and on which components are mounted and a second surface on which a ground plane is formed, a coupling stub being formed in part of the ground plane and connected to the circuit pattern; and a plane antenna having an antenna element, formed on a first surface of a dielectric substrate. The printed circuit board and the plane antenna are unified such that the second surface of the printed circuit board and a second surface of the dielectric substrate are opposed to each other and the coupling stub is placed in position to be coupled to the antenna element.
98 Citations
6 Claims
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1. The electronic circuit device comprising:
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a printed circuit board having a first surface on which a circuit pattern is formed and a second surface on which a ground plane is formed, a coupling stub being formed in a plane of said ground plane, said coupling stub being electrically isolated from said ground plane and electrically connected to said circuit pattern by an electrical conductor extending through said printed circuit board, and components including a modulating element mounted on said first surface of said printed circuit board and electrically connected to said circuit pattern; a plane antenna having an antenna element, formed on a first surface of a dielectric substrate, said printed circuit board and said plane antenna being attached to each other such that the second surface of said printed circuit board and a second surface of said dielectric substrate are juxtaposed to each other and said coupling stub is electromagnetically coupled to said antenna element; and signal modulating means for producing a modulated signal by modulating a non-modulated signal received by said antenna element, said non-modulated signal being electromagnetically coupled from said antenna element to said coupling stub and inputted from said coupling stub to said modulating element, said modulated signal being outputted from said modulating element to said coupling stub and electromagnetically coupled from said coupling stub to said antenna element, said signal modulating means includes means for changing a capacitance of said modulating element and a signal generating integrated circuit driven by a battery, said modulating element being operatively connected to said signal generating integrated circuit so as to receive a code output from said signal generating integrated circuit and to modulate said non-modulated signal according to said code output. - View Dependent Claims (2, 3, 4, 5)
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6. An electronic circuit device comprising:
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a printed circuit board having a first surface on which a circuit pattern is formed and a second surface on which a ground plane is formed, a coupling stub being formed in a plane of said ground plane, said coupling stub being electrically connected at one end to said ground plane and electrically connected to said circuit pattern by an electrical conductor extending through said printed circuit board, and components including a modulating element mounted on said first surface of said printed circuit board and electrically connected to said circuit pattern; a plane antenna having an antenna element, formed on a first surface of a dielectric substrate, said printed circuit board and said plane antenna being attached to each other such that the second surface of said printed circuit board and a second surface of said dielectric substrate are juxtaposed to each other and said coupling stub is electromagnetically coupled to said antenna element, and said coupling stub being a shortened stub provided parallel to one side of said antenna element and having a length of about a quarter of a wavelength of the service frequency; and signal modulating means for producing a modulated signal by modulating a non-modulated signal received by said antenna element, said non-modulated signal being electromagnetically coupled from said antenna element to said coupling stub and inputted from said coupling stub to said modulating element, said modulated signal being outputted from said modulating element to said coupling stub and electromagnetically coupled from said coupling stub to said antenna element, said signal modulating means including means for changing a capacitance of said modulating element and a signal generating integrated circuit driven by a battery, said modulating element being operatively connected to said signal generating integrated circuit so as to receive a code output from said signal generating integrated circuit and to modulate said non-modulated signal according to said code output.
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Specification