Antenna system with channeled RF currents
First Claim
1. A communication device with an improved antenna system, the device including a housing partially containing the antenna system along with a transceiver, the system comprising:
- an antenna being electrically coupled to the transceiver;
a first conductor coupled to a ground connection near the antenna and being contained within the housing and located distally from such surfaces of the housing that can be held by or placed in proximity to a user, the first conductor presenting a low impedance at operating frequencies of the communication device such that RF currents are attracted onto the first conductor; and
a second conductor coupled to the ground connection of the first conductor and being contained within the housing, the second conductor presenting a high impedance at operating frequencies of the communication device such that RF currents are diverted away from the second conductor.
4 Assignments
0 Petitions
Accused Products
Abstract
An improved antenna system to channel counterpoise currents for an unbalanced antenna such as a helical monopole. A first conductor, or ground resonator, is coupled to a ground connection near the antenna and is located distally from a user to reduce electromagnetic exposure. The first conductor presents a low impedance path at an operating frequency of the antenna such that RF currents are attracted onto the first conductor. A second conductor, such as a printed circuit board or user interface circuitry, is also coupled to the ground connection of the first conductor. The second conductor presents a high impedance path at the operating frequency of the antenna such that RF currents are diverted away from the second conductor which is held closer to a user than the first conductor.
127 Citations
20 Claims
-
1. A communication device with an improved antenna system, the device including a housing partially containing the antenna system along with a transceiver, the system comprising:
-
an antenna being electrically coupled to the transceiver;
a first conductor coupled to a ground connection near the antenna and being contained within the housing and located distally from such surfaces of the housing that can be held by or placed in proximity to a user, the first conductor presenting a low impedance at operating frequencies of the communication device such that RF currents are attracted onto the first conductor; and
a second conductor coupled to the ground connection of the first conductor and being contained within the housing, the second conductor presenting a high impedance at operating frequencies of the communication device such that RF currents are diverted away from the second conductor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A communication device with an improved antenna system, the device including a housing partially containing the antenna system along with a transceiver, the system comprising:
-
an antenna being electrically coupled to the transceiver;
a quarter wavelength transmission line with a first end located in proximity to the antenna, the transmission line comprising;
a first conductor coupled to the first end of the transmission line and being contained within the housing and located at an upper rear portion of the housing, the first conductor being substantially resonant so as to present a low impedance at operating frequencies of the communication device such that RF currents are attracted onto the first conductor; and
a second conductor shorted to the first conductor at the first end of the transmission line and being contained within the housing, the second conductor being substantially anti-resonant so as to present a high impedance at operating frequencies of the communication device such that RF currents are diverted away from the second conductor, the transmission line transforms a short at the first end to an open circuit at a second end of the first conductor so as to present a low driving-point impedance to counterpoise currents flowing from the antenna. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
-
-
19. A communication device with an improved antenna system, the device including a housing partially containing the antenna system along with a transceiver, the system comprising:
-
an unbalanced antenna being electrically coupled to the transceiver;
a quarter wavelength transmission line with a first end located in proximity to the antenna, the transmission line comprising;
a first conductor coupled to a first end of the transmission line and being contained within the housing and located at an upper rear portion of the housing, the first conductor having an electrical length of about one-quarter wavelength so as to be substantially resonant and present a low impedance and a high susceptance at operating frequencies of the communication device such that RF currents are attracted onto the first conductor; and
a second conductor coupled to the first conductor at the first end of the transmission line and being contained within the housing, the second conductor having an electrical length of about one-half wavelength so as to be substantially anti-resonant and present a high impedance at operating frequencies of the communication device such that RF currents are diverted away from the second conductor, the transmission line transforms the coupling at the first end to an open circuit at a second end of the first conductor so as to present a low driving-point impedance to counterpoise currents flowing from the antenna. - View Dependent Claims (20)
-
Specification