초록 ▼

A printed circuit antenna with broadband input coupling is disclosed. An elongated conductive antenna element arranged in the form of a loop is disposed on a dielectric substrate formed on a ground plane. The antenna element has first and second adjacent end portions separated by a gap. The second e

A printed circuit antenna with broadband input coupling is disclosed. An elongated conductive antenna element arranged in the form of a loop is disposed on a dielectric substrate formed on a ground plane. The antenna element has first and second adjacent end portions separated by a gap. The second end portion is connected to the ground plane. An input coupler is provided for matching an input impedance of the antenna to the antenna feed circuitry. The input coupler can comprise a conductive line disposed on the substrate adjacent to the antenna element. The conductive line is separated from the antenna element by a coupling space for coupling to the antenna element an input signal applied to the input coupler. The conductive line extends parallel to a portion of the antenna element including the first end portion. The arrangement has the advantage of having an input impedance that is relatively insensitive to adjustments affecting the antenna center frequency.

대표청구항 ▼

A printed circuit antenna with broadband input coupling is disclosed. An elongated conductive antenna element arranged in the form of a loop is disposed on a dielectric substrate formed on a ground plane. The antenna element has first and second adjacent end portions separated by a gap. The second e

A printed circuit antenna with broadband input coupling is disclosed. An elongated conductive antenna element arranged in the form of a loop is disposed on a dielectric substrate formed on a ground plane. The antenna element has first and second adjacent end portions separated by a gap. The second end portion is connected to the ground plane. An input coupler is provided for matching an input impedance of the antenna to the antenna feed circuitry. The input coupler can comprise a conductive line disposed on the substrate adjacent to the antenna element. The conductive line is separated from the antenna element by a coupling space for coupling to the antenna element an input signal applied to the input coupler. The conductive line extends parallel to a portion of the antenna element including the first end portion. The arrangement has the advantage of having an input impedance that is relatively insensitive to adjustments affecting the antenna center frequency. ice is established; identification code check means for, prior to executing the link processing, receiving another link identification code which is already being used by the immobile device for communication with another mobile device in the communication service area, and checking a coincidence of the own link identification code with the another identification code; and identification code change means for changing the own link identification code in response to a check result indicating the coincidence of the link identification code. 2. A mobile communication device of claim 1, wherein: the identification code check means is further for checking a coincidence of the changed own link identification code; and the identification code change means is further for changing the changed own link identification code in response to a check result indicating the coincidence of the changed own link identification code. 3. A mobile communication device of claim 1, wherein: the identification code check means is for repeating its checking operation at least twice. 4. A mobile communication device of claim 1, wherein: the identification code change means is for changing the own link identification code by adding a predetermined value to the own link identification code. 5. A mobile communication device of claim 1, wherein: the identification code change means is for changing the own link identification code by using a random number. 6. A mobile communication device of claim 1, wherein: the communication control means is for causing the identification code change means to change the own link identification code, when a code change command is received from the immobile device during an execution of the link processing. 7. A mobile communication device of claim 1, wherein: the communication control means is for, when a code change command is received from the immobile device during an execution of the communication processing, interrupting an execution of the communication processing, for causing the identification code change means to change the own link identification code, and for controlling the identification code check means to check a coincidence of the changed link identification code. 8. A mobile communication device of claim 6, wherein: the identification code change means is for changing the own link identification code based on a random number in a code change operation when the code change command is received. 9. A mobile communication device of claim 7, wherein: the identification code change means is for changing the own link identification code based on a random number in a code change operation when the code change command is received. 10. A mobile communication device of claim 1, wherein: the identification code check means is for interrupting its check operation and executing the link processing, when a present communication service area is determined as being inter-related with a previous communication service area in its check operation. 11. A mobile communication device of claim 1 further comprising: identification code generation means for generating the own link identification code. 12. A mobile communication device of claim 11, wherein: the identification code generation means is for generating the own link identification code based on a random number. 13. A mobile communication device of claim 11, wherein: the identification code generation means is for generating a new link identification code before a next check operation is initiated, when the communication processing ends. 14. A mobile communication device of claim 12, wherein: the identification code generation means is for generating a new link identification code before a next check operation is initiated, when the communication processing ends. 15. An immobile communication device for communication with mobile communication devices, the device comprising: communication control means f