Filter technique for increasing antenna isolation in portable communication devices
OwnerRandolph E. Standkeinventor
Life of this patent
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Abstract
Provided is a system and method for eliminating the effects of antenna coupling by increasing the isolation between closely mounted antennas on a portable wireless communications device. Increased isolation is achieved by providing a ceramic resonator in the path of each of the antennas. The ceramic resonator placed in the path of a particular antenna eliminates the effects of coupling caused by a particular one of the other antennas by rejecting signals associated with the particular antenna.
Claims9
A portable communications device structured for communication in a wireless communications network, the device comprising:
- a first circuit configured to produce a first frequency signal;
- a first antenna structured to be electrically coupled to the first circuit, the first circuit and the first antenna forming a first transmission path between the first circuit and the first antenna when the first circuit and the first antenna are electrically coupled together;
- at least a second circuit configured to produce at least a second frequency signal;
- at least a second antenna structured to be electrically coupled to the second circuit, the second circuit and the second antenna forming a second transmission path between the second circuit and the second antenna when electrically coupled together;
- a first dielectric resonator arranged along the first transmission path and configured to filter effects of the second frequency signal from the first transmission path;
- and
- at least a second dielectric resonator arranged along the second transmission path and configured to filter effects of the first frequency signal from the second transmission path.
A method for providing antenna isolation in a portable communications device including at least two antennas, the method comprising:
- inserting a first ceramic resonator in a first transmission path to a first of the at least two antennas, the first transmission path being at least between the first antenna and a first frequency circuit which processes signals associated with the first antenna;
- and
- inserting a second ceramic resonator in a second transmission path to a second of the at least two antennas, the second transmission path being at least between the second antenna and a second frequency circuit which processes signals associated with the second antenna;
- wherein the first ceramic resonator filters effects associated with the second antenna and wherein the second ceramic resonator filters effects associated with the first antenna.
A portable communications device structured for communication in a wireless communications network, the device comprising:
- a first circuit configured for producing a first frequency signal;
- a first antenna structured to be electrically coupled to the first circuit, the first circuit and the first antenna forming a first transmission path between the first circuit and the first antenna when the first circuit and the first antenna are electrically coupled together;
- at least a second circuit configured for producing at least a second frequency signal;
- and
- a dielectric resonator arranged along the first transmission path and configured to filter effects of the second frequency signal from the first transmission path.
Dependencies are inferred from the claim text.