Mobile wireless communications device with reduced microphone noise from radio frequency communications circuitry
AssigneeResearch In Motion Limited
InventorsMichael Corrigan, George Mankaruse, Lizhong Zhu
Life of this patent
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Abstract
A mobile wireless communications device includes a housing and circuit board in the housing and having radio frequency (RF) circuitry and a power amplifier and microphone mounted thereon. An antenna is carried within the housing and operative with the RF circuitry. An RF shield surrounds and isolates the microphone from the RF circuitry, power amplifier and antenna and shields the microphone from radiated energy generated from the RF circuitry, antenna or power amplifier.
Claims22
A mobile wireless communications device comprising:
- a housing;
- a circuit board carried by said housing and having radio frequency (RF) circuitry and a power amplifier carried by the circuit board;
- a microphone mounted on the circuit board and operatively connected to said RF circuitry;
- an antenna carried within the housing and operative with said RF circuitry;
- an RF shield surrounding and isolating said microphone from the RF circuitry, power amplifier, and antenna, and shielding said microphone from radiated energy generated from the RF circuitry, antenna or power amplifier, said RF shield having a sound opening over said microphone;
- and
- a cover extending over said RF shield and having a sound opening aligned with the sound opening in the RF shield and an acoustical tube extending from the sound opening in the cover through the sound opening in the RF shield to the microphone.
A mobile wireless communications device comprising:
- a housing;
- a circuit board carried by said housing and having radio frequency (RF) circuitry and a power amplifier carried by the circuit board;
- a microphone mounted on the circuit board and operatively connected to said RF circuitry;
- an antenna carried within the housing and operative with said RF circuitry;
- an RF shield surrounding and isolating said microphone from the RF circuitry, power amplifier, and antenna, and shielding said microphone from radiated energy generated from the RF circuitry, antenna or power amplifier, said RF shield having a sound opening over said microphone;
- a cover extending over said housing at said microphone and having a sound opening aligned with the sound opening in the RF shield;
- an acoustical tube extending from the sound opening in the cover to the sound opening in the RF shield and through said RF shield to said microphone;
- and
- an isolation ring surrounding said acoustical tube between said cover and RF shield to provide RF and acoustical sealing.
A method for making a mobile wireless communications device, which comprises:
- providing a housing, a circuit board carried by the housing, radio frequency (RF) circuitry and a power amplifier carried by the circuit board, a microphone mounted on the circuit board and operatively connected to said RF circuitry, and an antenna positioned within the housing and operatively connected to the RF circuitry;
- and
- isolating the microphone from the RF circuitry, power amplifier and antenna for shielding the microphone from radiated energy generated from the RF circuitry, antenna or power amplifier by securing a metallic housing to the circuit board that covers the microphone for shielding the microphone from the radiated energy, and including a sound opening in the RF shield, and positioning a cover over the RF shield and having a sound opening aligned with the sound opening in the RF shield and an acoustical tube extending from the sound opening in the cover through the sound opening in the RF shield to the microphone.
Dependencies are inferred from the claim text.