US 8,798,554 B2 · Tunable antenna system with multiple feeds

Abstract

Electronic devices may be provided that contain wireless communications circuitry. The wireless communications circuitry may include radio-frequency transceiver circuitry and antenna structures. The antenna structures may form an antenna having first and second feeds at different locations. The transceiver circuit may have a first circuit that handles communications using the first feed and may have a second circuit that handles communications using the second feed. A first filter may be interposed between the first feed and the first circuit and a second filter may be interposed between the second feed and the second circuit. The first and second filters and the antenna may be configured so that the first circuit can use the first feed without being adversely affected by the presence of the second feed and so that the second circuit can use the second feed without being adversely affected by the presence of the first feed.

Claims26

Dependent claims

An electronic device, comprising:

an antenna;
a first antenna feed at a first location in the antenna;
a second antenna feed at a second location in the antenna;
a first radio-frequency receiver that is configured to receive radio-frequency signals from the antenna in a first communications band;
a second radio-frequency receiver that is configured to receive radio-frequency signals from the antenna in a second communications band;
a first filter coupled between the first radio-frequency receiver and the first antenna feed, wherein the first filter is configured to pass the radio-frequency signals in the first communications band and is configured to block the radio-frequency signals in the second communications band;
and
a second filter coupled between the second radio-frequency receiver and the second antenna feed, wherein the second filter is configured to pass the radio-frequency signals in the second communications band and is configured to block the radio-frequency signals in the first communications band, wherein the second filter comprises a notch filter.

5 more elements

An electronic device, comprising:

an antenna having a first antenna feed at a first location and a second antenna feed at a second location;
a first radio-frequency receiver that is configured to receive radio-frequency signals from the antenna in a first communications band;
a second radio-frequency receiver that is configured to receive radio-frequency signals from the antenna in a second communications band;
a first filter coupled between the first radio-frequency receiver and the first antenna feed, wherein the first filter is configured to pass the radio-frequency signals in the first communications band and is configured to exhibit a first impedance in the second communications band;
a second filter coupled between the second radio-frequency transceiver and the second antenna feed, wherein the second filter is configured to pass the radio-frequency signals in the second communications band and is configured to exhibit a second impedance in the first communications band, wherein the second filter and the antenna are configured so that the antenna exhibits a first resonance in the first communications band while the second filter is exhibiting the second impedance in the first communications band and wherein the first filter and the antenna are configured so that the antenna exhibits a second resonance in the second communications band while the first filter is exhibiting the first impedance in the second communications band;
and
a housing containing conductive structures that form an antenna ground for the antenna and having a peripheral conductive member that runs around at least some edges of the housing, wherein at least part of the peripheral conductive member forms an antenna resonating element for the antenna.

4 more elements

An electronic device, comprising:

an antenna having first and second antenna feeds at different locations;
radio-frequency transceiver circuitry having a first circuit that handles communications associated with the first antenna feed and a second circuit that handles communications associated with the second antenna feed;
a first filter coupled between the first antenna feed and the first circuit, wherein the first filter is configured to pass radio-frequency signals in a first communications band and is configured to block radio-frequency signals in a second communications band;
a second filter coupled between the second antenna feed and the second circuit, wherein the second filter is configured to block the radio-frequency signals in the first communications band and is configured to pass the radio-frequency signals in the second communications band;
a tunable circuit coupled to the second filter that is configured to tune the antenna;
and
a tunable capacitor in the tunable circuit.

4 more elements

Dependencies are inferred from the claim text.

Tunable antenna system with multiple feeds

Life of this patent

Tunable antenna system with multiple feeds

Life of this patent

Abstract

Claims26