Wireless microphone device
First Claim
1. A wireless microphone device comprising:
- a circuit board that is sectioned into a first circuit area and a second circuit area and makes the respective circuit areas function as antenna elements of a dipole antenna;
an oscillation circuit that is arranged in said first circuit area and generates a high frequency signal on a basis of a voice signal from a sound collecting element;
a feeding path configured to feed said high frequency signal to an electrically conductive layer in said first circuit area through a feeding point positioned on a second circuit area side of said first circuit area; and
a high frequency shield covering at least a part of said feeding path, whereinsaid high frequency shield is formed by covering said feeding path with a metal case having an opening at a bottom face and conducting said metal case to the electrically conducting layer in said first circuit area.
1 Assignment
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Accused Products
Abstract
To provide a wireless microphone device that enables a circuit board, which is to be provided with an oscillation circuit, to be decreased in size without deteriorating radiation characteristics.
The wireless microphone device is configured to include: a circuit board 5 that is sectioned into circuit areas 11a and 11b and makes the respective circuit areas function as antenna elements of a dipole antenna; an oscillation circuit 21 that is arranged in the circuit area 11b and generates a high frequency signal on the basis of a voice signal from a microphone 2a; a feeding path for feeding the high frequency signal to an electrically conductive layer 11 in the circuit area 11b through a feeding point positioned on the circuit area 11a side distant from the oscillation circuit 21; and a high frequency shield covering at least a part of the feeding path. The high frequency shield is formed by covering the feeding path with a metal case 12 having an opening at a bottom face and conducting the metal case 12 to the electrically conducting layer 11 in the circuit area 11b.
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Citations
17 Claims
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1. A wireless microphone device comprising:
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a circuit board that is sectioned into a first circuit area and a second circuit area and makes the respective circuit areas function as antenna elements of a dipole antenna; an oscillation circuit that is arranged in said first circuit area and generates a high frequency signal on a basis of a voice signal from a sound collecting element; a feeding path configured to feed said high frequency signal to an electrically conductive layer in said first circuit area through a feeding point positioned on a second circuit area side of said first circuit area; and a high frequency shield covering at least a part of said feeding path, wherein said high frequency shield is formed by covering said feeding path with a metal case having an opening at a bottom face and conducting said metal case to the electrically conducting layer in said first circuit area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A wireless microphone device comprising:
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a circuit board that is sectioned into a first circuit area and a second circuit area and makes the respective circuit areas function as antenna elements of a dipole antenna; an oscillation circuit that is arranged in said first circuit area and generates a high frequency signal on a basis of a voice signal from a sound collecting element; a feeding path configured to feed said high frequency signal to an electrically conductive layer in said first circuit area through a feeding point positioned on a second circuit area side of said first circuit area; a high frequency shield covering at least a part of said feeding path; and a high frequency isolation element configured to connect said first circuit area and said second circuit area electrically, and configured to pass a signal having a frequency lower than a frequency of said high frequency signal.
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14. A wireless microphone device comprising:
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a first circuit board and a second circuit board that are arranged with end faces facing to each other and made to function as antenna elements of a dipole antenna; an oscillation circuit that is provided on a main face of said first circuit board and generates a high frequency signal on a basis of a voice signal from a sound collecting element; a feeding path configured to feed said high frequency signal to an electrically conductive layer of said first circuit board through a feeding point positioned on a second circuit board side of said end face of said first circuit board; and a high frequency shield covering at least a part of said feeding path, wherein said high frequency shield is formed by covering said feeding path with a metal case having an opening at a bottom face and conducting said metal case to the electrically conducting layer in said first circuit board. - View Dependent Claims (15, 16, 17)
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Specification