PRINTED CIRCUIT BOARD CAPABLE OF DECREASING ELECTROMAGNETIC INTERFERENCE

• US 20130135835A1
• Filed: 12/20/2011
• Published: 05/30/2013
• Est. Priority Date: 11/24/2011
• Status: Abandoned Application

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: LIU, HSIN-HUNG, CHANG, SHU-WEI, YANG, FU-HSIUNG
• Application Number:
  US13/330,709
• Publication Number:
  US 20130135835A1
• Time in Patent Office: Days
• US Class Current: 361/782
• CPC Class Codes: H04B 15/02 Reducing interference from electric apparatus by means located at or near the interfering apparatus

Abstract

A printed circuit board includes an antenna, an EMI source, and inductor. The EMI source is connected to the printed circuit board by a pin. The inductor is connected between the pin and a ground of the printed circuit board. The connected inductor increases the resonant frequency of the EMI source to make the resonant frequency of EMI source away from the antenna. Thereby the EMI generated by the EMI source is decreased and the radiation efficiency of the antenna increases.

Claims

1. A printed circuit board comprising:

an antenna;

an electromagnetic interference (EMI) source connected to the printed circuit board by a pin; and

an inductor connected between the pin and a ground of the printed circuit board.

2. The printed circuit board as described in claim 1, wherein the EMI source is a component covered by a piece of metal and near the antenna.

3. The printed circuit board as described in claim 1, wherein the antenna is a GPS antenna whose frequency band is 1.575 GHZ.

4. The printed circuit board as described in claim 1, wherein the inductance value of the inductor is in a range from 12 nH to 82 nH.

5. The printed circuit board as described in claim 1, wherein the inductance value of the inductor is inversely proportional to a resonant frequency of the EMI source.