Wireless communication module
AssigneeMurata Manufacturing Co., Ltd.
InventorsAkihiro Ohno, Yu Ishiwata
Life of this patent
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Abstract
A power supply circuit includes a switching element coupled in a current path between an input terminal and an output terminal and includes a smoothing capacitor coupled between the output terminal and a ground. A bypass capacitor is coupled between the input terminal and the ground. An antenna element shares the ground with the power supply circuit. A frequency filter having a stop band that is an operating frequency band of the antenna element is inserted in series in at least either a current path between the switching element and the smoothing capacitor or a current path between the bypass capacitor and the switching element. It is possible to suppress deterioration of wireless communication quality due to noise caused in a DC-DC converter.
Claims17
A wireless communication module comprising:
- a power supply circuit including a switching element coupled in a current path between an input terminal and an output terminal, and including a smoothing capacitor coupled between the output terminal and a ground;
- a bypass capacitor coupled between the input terminal and the ground;
- an antenna element sharing the ground with the power supply circuit;
- and
- a frequency filter inserted in series in at least either a current path between the switching element and the smoothing capacitor or a current path between the bypass capacitor and the switching element and having a stop band that is an operating frequency band of the antenna element, wherein
- the smoothing capacitor is connected between the output terminal and the ground such that the smoothing capacitor smooths an AC signal of the output terminal.
Dependencies are inferred from the claim text.