Device for controlling extension and retraction of an antenna
AssigneeNEC Corporation
InventorMamoru Shimazaki
Life of this patent
Estimating the term…
Abstract
In an IC memory card radio modem including an antenna, intensity of electric field received by the antenna is measured by an electric field intensity detector. An antenna driver is controlled such that, when the electric field intensity exceeds a predetermined value, the antenna is retracted or is not risen. The antenna is extended when the electric field intensity is equal to or lower than the predetermined value.
Claims26
A communication device, which includes a body having a keyboard and a transceiver having an antenna, for operating extension and retraction of said antenna, comprising:
- detecting means for detecting electric field intensity of a received signal when said transceiver is inserted into said body;
- and
- control means for controlling said extension and retraction of said antenna in response to said electric field intensity,
- wherein said antenna is retracted when said transceiver is inserted into said body and said control means controls an antenna condition from the retracted antenna condition.
A communication device including a body having a keyboard and a transceiver having an antenna, inserted into said body, comprising:
- means for detecting electric field intensity of a signal received by said antenna when said transceiver is inserted into said body;
- and
- driving means for operating one of an extension and retraction of said antenna in response to said electric field intensity, whereby said antenna is retracted when said signal is received thereby reducing the amount of space occupied by said communication device,
- wherein said antenna is retracted when said transceiver is inserted into said body and said driving means operates an antenna condition from the retracted antenna condition.
A method for controlling extension and retraction of an antenna in a communication device having a body and a transceiver, the method comprising the steps of:
- detecting electric field intensity of a signal received by said antenna when said transceiver is inserted into said body;
- comparing a detected electric field intensity with a predetermined value;
- and
- controlling said extension and retraction of said antenna in response to a result of said comparing step,
- wherein said antenna is retracted when said transceiver is inserted into said body and said controlling step controls an antenna condition from a retracted antenna condition.
A method for controlling extension and retraction of an antenna in a communication device having a body and a transceiver, the method comprising the steps of:
- measuring electric field intensity of a signal received by said antenna when said transceiver is inserted into said body;
- converting said measuring electric field intensity into a digital electric field intensity;
- integrating said digital electric field intensity for a predetermined time;
- comparing said integrated electric field intensity with a predetermined value;
- and
- controlling said extension and retraction of said antenna in response to the result of comparing,
- wherein said antenna is retracted when said transceiver is inserted into said body and said controlling step controls an antenna condition from a retracted antenna condition.
The method for controlling as claimed in claim 23, wherein said controlling step comprises:
- retracting said antenna when said electric field intensity exceeds said predetermined value and extending said antenna when said electric field intensity is not above said predetermined value.
Dependencies are inferred from the claim text.