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US 2026/0291074 A1Published application
Low elevation angle nulling antenna methods and systems
OwnerJoseph Botros, Julien Hautcoeur +1inventors
InventorsJOSEPH BOTROS, JULIEN HAUTCOEUR, GYLES PANTHER
Life of this patent
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Abstract
Global navigation satellite systems (GNSS) employ a network of geo-spatially positioned satellites to broadcast precisely synchronized navigation messages, thereby providing for determination of a network time and a geolocation by dedicated GNSS receivers. However, such GNSS antennas are susceptible to interference incident along the direction of the horizon. Reducing antenna susceptibility is typically achieved by implementing an antenna with reduced or null gain at low elevations. However, such designs are narrowband whilst GNSS antennas should operate broadband, e.g. on multiple GNSS bands. Accordingly, broadband antenna designs with reduced or null gain at low elevations are provided.
Claims20
A method comprising:
- providing an upper antenna element for receiving or transmitting a circularly polarized wireless signal within a predetermined frequency range disposed above a lower antenna element along a common axis with the lower antenna element, the upper antenna element comprising a first electrical interface which is coupled to a circuit via an electrical path;
- providing the lower antenna element for the one of the receiving and transmitting another circularly polarized wireless signal within the predetermined frequency range, the lower antenna element comprising a second electrical interface which is coupled to the circuit via another electrical path;
- and
- providing a phase circuit disposed within the another electrical path between the lower antenna element and the circuit;
- wherein
- the circularly polarized wireless signal and another circularly polarized wireless signal are out of phase by 180° such that the antenna exhibits a maximum gain along the common axis and a minimum gain orthogonal to the common axis;
- the phase circuit in combination with the another electrical path between the circuit and the lower antenna provides a phase change versus frequency at the second electrical interface equal to another phase change versus frequency at the first electrical interface;
- and
- the lower antenna element and upper antenna element are rotationally offset with respect to one another where the rotational offset is established in dependence upon the absolute phase difference between the circularly polarized wireless signal at the first electrical interface and the another circularly polarized wireless signal at the second electrical interface.
6 more elements
An antenna comprising:
- an upper antenna element for receiving or transmitting a circularly polarized wireless signal within a predetermined frequency range disposed above a lower antenna element along a common axis with the lower antenna element, the upper antenna element comprising a first electrical interface which is coupled to a circuit via an electrical path;
- the lower antenna element for the one of the receiving and transmitting another circularly polarized wireless signal within the predetermined frequency range, the lower antenna element comprising a second electrical interface which is coupled to the circuit via another electrical path;
- and
- a phase circuit disposed within the another electrical path between the lower antenna element and the circuit;
- wherein
- the circularly polarized wireless signal and another circularly polarized wireless signal operate in conjunction with each other such that the antenna exhibits a maximum gain along the common axis and a minimum gain orthogonal to the common axis;
- the phase circuit in combination with the another electrical path between the circuit and the lower antenna provides a phase change versus frequency at the second electrical interface equal to another phase change versus frequency at the first electrical interface;
- and
- the lower antenna element and upper antenna element are rotationally offset with respect to one another where the rotational offset is established in dependence upon the absolute phase difference between the circularly polarized wireless signal at the first electrical interface and the another circularly polarized wireless signal at the second electrical interface.
6 more elements
An antenna comprising:
- an upper antenna element for receiving or transmitting a circularly polarized wireless signal within a predetermined frequency range disposed above a lower antenna element along a common axis with the lower antenna element, the upper antenna element comprising a first electrical interface which is coupled to a circuit via an electrical path;
- the lower antenna element for the one of the receiving and transmitting another circularly polarized wireless signal within the predetermined frequency range, the lower antenna element comprising a second electrical interface which is coupled to the circuit via another electrical path;
- and
- a phase circuit disposed within the electrical path between the upper antenna element and the circuit;
- wherein
- the circularly polarized wireless signal and another circularly polarized wireless signal operate in conjunction with each other such that the antenna exhibits a maximum gain along the common axis and a minimum gain orthogonal to the common axis;
- the phase circuit in combination with the electrical path between the circuit and the upper antenna provides a phase change versus frequency at the first electrical interface equal to another phase change versus frequency at the second electrical interface;
- and
- the lower antenna element and upper antenna element are rotationally offset with respect to one another where the rotational offset is established in dependence upon the absolute phase difference between the circularly polarized wireless signal at the first electrical interface and the another circularly polarized wireless signal at the second electrical interface.
6 more elements
An antenna comprising:
- an upper antenna element for receiving or transmitting a circularly polarized wireless signal within a predetermined frequency range disposed above a lower antenna element along a common axis with the lower antenna element, the upper antenna element comprising a first electrical interface which is coupled to a circuit via an electrical path;
- the lower antenna element for the one of the receiving and transmitting another circularly polarized wireless signal within the predetermined frequency range, the lower antenna element comprising a second electrical interface which is coupled to the circuit via another electrical path;
- and
- a first phase circuit disposed within the electrical path between the upper antenna element and the circuit;
- and
- a second phase circuit disposed within the another electrical path between the lower antenna element and the circuit;
- wherein
- the circularly polarized wireless signal and another circularly polarized wireless signal operate in conjunction with each other such that the antenna exhibits a maximum gain along the common axis and a minimum gain orthogonal to the common axis;
- the first phase circuit in combination with the electrical path between the circuit and the upper antenna provides a phase change versus frequency at the first electrical interface that is equivalent to another phase change versus frequency at the second electrical interface established by the second phase circuit in combination with the another electrical path;
- and
- the lower antenna element and upper antenna element are rotationally offset with respect to one another where the rotational offset is established in dependence upon the absolute phase difference between the circularly polarized wireless signal at the first electrical interface and the another circularly polarized wireless signal at the second electrical interface.
8 more elements
Dependencies are inferred from the claim text.