The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 20, 2012
Filed:
Sep. 10, 2007
Mitsuru Nakashima, Hyogo, JP;
Koji Moriguchi, Hyogo, JP;
Mitsuru Nakashima, Hyogo, JP;
Koji Moriguchi, Hyogo, JP;
TOA Corporation, Hyogo, JP;
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 boardthat is sectioned into circuit areasandand makes the respective circuit areas function as antenna elements of a dipole antenna; an oscillation circuitthat is arranged in the circuit areaand generates a high frequency signal on the basis of a voice signal from a microphone; a feeding path for feeding the high frequency signal to an electrically conductive layerin the circuit areathrough a feeding point positioned on the circuit areaside distant from the oscillation circuit; 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 casehaving an opening at a bottom face and conducting the metal caseto the electrically conducting layerin the circuit area