Electrical device and electrical transmitter-receiver particularly useful in a CT2 cordless telephone
First Claim
1. An electrical device, comprising:
- a housing enclosing electrical circuitry of the electrical device;
an antenna rod carried by said housing for use in long-range operation of the device and pretuned to a predetermined frequency;
an antenna coil carried by one end of said antenna rod for use in short-range operation of the device and pretuned to the same predetermined frequency;
said antenna rod being movably mounted through an opening in the housing to a retracted position wherein substantially only the antenna coil is disposed externally of the housing, or to an extended position wherein substantially the complete antenna rod and the antenna coil are disposed externally of the housing;
an electrical switching means effective when the antenna rod is in its retracted position to connect the antenna coil to said electrical circuit and thereby to condition the device for short-range operation, and when the antenna rod is in its extended position to connect the antenna rod to said electrical circuit, to disconnect the antenna coil therefrom, and thereby to condition the device for long-range operation.
1 Assignment
0 Petitions
Accused Products
Abstract
An electrical transmitter-receiver, particularly useful as a CT2 cordless telephone, includes a quarter wavelength antenna rod carried by the housing, and a quarter wavelength antenna coil carried by one end of the antenna rod. The antenna rod is movably mounted through an opening in its housing to a retracted position wherein substantially only the antenna coil is disposed externally of the housing, or to an extended position wherein substantially the complete antenna rod and the antenna coil are disposed externally of the housing. When the antenna rod is in its retracted position an electrical switch connects the antenna coil to the electrical circuit, and when the antenna rod is in its extended position an electrical switch connects the antenna rod to the electrical circuit.
103 Citations
20 Claims
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1. An electrical device, comprising:
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a housing enclosing electrical circuitry of the electrical device; an antenna rod carried by said housing for use in long-range operation of the device and pretuned to a predetermined frequency; an antenna coil carried by one end of said antenna rod for use in short-range operation of the device and pretuned to the same predetermined frequency; said antenna rod being movably mounted through an opening in the housing to a retracted position wherein substantially only the antenna coil is disposed externally of the housing, or to an extended position wherein substantially the complete antenna rod and the antenna coil are disposed externally of the housing; an electrical switching means effective when the antenna rod is in its retracted position to connect the antenna coil to said electrical circuit and thereby to condition the device for short-range operation, and when the antenna rod is in its extended position to connect the antenna rod to said electrical circuit, to disconnect the antenna coil therefrom, and thereby to condition the device for long-range operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An electrical transmitter-receiver, particularly useful in a CT2 cordless telephone comprising:
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a housing enclosing electrical circuitry of the transmitter-receiver; an antenna rod pretuned to a predetermined frequency carried by said housing; an antenna coil pretuned to the same predetermined frequency carried by one end of said antenna rod; said antenna rod being movably mounted through an opening in the housing to a retracted position wherein substantially only the antenna coil is disposed externally of the housing, or to an extended position wherein substantially the complete antenna rod and the antenna coil are disposed externally of the housing; an electrical switching means effective when the antenna rod is in its retracted position to connect the antenna coil to said electrical circuit and to disconnect the antenna rod therefrom, and when the antenna rod is in its extended position to connect the antenna rod to said electrical circuit and to disconnect the antenna coil therefrom. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification