Apparatus for connecting a radiotelephone to an external antenna
First Claim
1. An apparatus for connecting a radio communication device equipped with a first antenna to a second antenna electric couple, said apparatus comprisinga resonant element for transmitting radio power through an electromagnetic coupling between said first antenna and said resonant element, said resonant element comprising a first connection point and a second connection point, andsignal transmission means for transmitting the radio power between said resonant element and said second antenna, characterized by means for electrically connecting the first connection point of said resonant element to the ground potential plane of said radio communication device and for connecting the second connection point to said signal transmission means.
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Accused Products
Abstract
The present invention concerns an apparatus for connecting a radio frequency signal between the integral antenna of the radio communication device and the external antenna, preferably a car antenna. The apparatus in accordance with the invention comprises a resonant element, preferably a helical coil conductor having an electromagnetic coupling with the antenna of the radio communication device and its first connection point being coupled capacitatively with the ground plane of the radio communication device and its second connection point being connected with a coaxial conductor to said external antenna. The apparatus in accordance with the invention further comprises a matching element, preferably a helical coil conductor coupled electromagnetically to said antenna and said resonant element.
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Citations
11 Claims
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1. An apparatus for connecting a radio communication device equipped with a first antenna to a second antenna electric couple, said apparatus comprising
a resonant element for transmitting radio power through an electromagnetic coupling between said first antenna and said resonant element, said resonant element comprising a first connection point and a second connection point, and signal transmission means for transmitting the radio power between said resonant element and said second antenna, characterized by means for electrically connecting the first connection point of said resonant element to the ground potential plane of said radio communication device and for connecting the second connection point to said signal transmission means.
Specification