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US 8,412,137 B2Granted
Radio transmitter
AssigneeTDK Corporation
InventorSeishi Takahara
Life of this patent
Estimating the term…
Abstract
A radio transmitter includes a radio module, a battery from which power is fed to the radio module, and a metal plate. The radio module includes a transmission module generating a transmission signal and an antenna configured to wirelessly transmit the transmission signal. The metal plate is located so as to cover a part of the battery and a part of the antenna. The battery is electromagnetically coupled to the antenna. A main radiation direction of the antenna is parallel to a principal surface of the metal plate.
Claims6
A radio transmitter comprising:
- a radio module;
- a battery from which power is fed to the radio module;
- a metal plate;
- and
- a mounting substrate having a first principal surface facing the metal plate and a second principal surface opposite to the first principal surface,
- wherein the radio module comprises a transmission module generating a transmission signal and an antenna configured to wirelessly transmit the transmission signal,
- the metal plate is located so as to cover a part of the battery and a part of the antenna,
- the battery is electromagnetically coupled to the antenna,
- a main radiation direction of the antenna is parallel to a principal surface of the metal plate,
- the radio module is formed on the first principal surface, and a ground electrode of the radio module is formed on the second principal surface, the mounting substrate being located between the radio module and the ground electrode, and
- the antenna has a spiral shape, a helical shape, or a meander shape on the mounting substrate, and has pieces on both the first and second principal surfaces of the mounting substrate.
8 more elements
Dependencies are inferred from the claim text.