A quadrifilar helix antenna includes a cylindrical support extending along an antenna axis; a plurality of spiral antenna elements wrapped helically on the cylindrical support and along the antenna axis from a feed end to a remote end; a ground plane having a diameter of about 300 mm and perpendicular to the antenna axis; and each of the antenna elements including a plurality of breaks, with the breaks having capacitors between conducting portions of the antenna elements. All capacitors a positioned higher than 60 mm above the ground plane, and capacitance value varies inversely with height. The antenna exhibits a DU(10°)=−20 dB or better at an operating frequency f.sub.0=1575 MHz. The diameter of the cylindrical support is 30 +/−5 mm. A total height of the cylindrical support is 300 +/−50 mm. A winding angle of the helix is variable.

A quadrifilar helix antenna includes a cylindrical support extending along an antenna axis; a plurality of spiral antenna elements wrapped helically on the cylindrical support and along the antenna axis from a feed end to a remote end; a ground plane having a diameter of about 300 mm and perpendicular to the antenna axis; and each of the antenna elements including a plurality of breaks, with the breaks having capacitors between conducting portions of the antenna elements. All capacitors a positioned higher than 60 mm above the ground plane, and capacitance value varies inversely with height. The antenna exhibits a DU(10°)=−20 dB or better at an operating frequency f.sub.0=1575 MHz. The diameter of the cylindrical support is 30 +/−5 mm. A total height of the cylindrical support is 300 +/−50 mm. A winding angle of the helix is variable.

An antenna device includes a patch antenna serving as a first antenna; and a second antenna including capacitance loading elements, the capacitance loading elements being located above the patch antenna and also arranged separately in a predetermined direction. Also, an antenna device includes a patch antenna serving as a first antenna; and a second antenna including capacitance loading elements, the capacitance loading elements being located above the patch antenna, and a slit-like cutout part in a predetermined direction being formed in at least one of side edges of the capacitance loading elements.

An antenna-equipped connector comprising a plug having separate conductive portions and configured to be received by an audio output jack of an electronic device, a jack configured to connect to the conductive portions of the plug via respective of at least two conductive lines, an antenna connection node that branches from a branching point on one of the at least two conductive lines, and an antenna connected to the antenna connection node.

An antenna (100) for emitting radiation from at least one electromagnetic traveling wave which propagates along a guide path is designed to reduce reflection of the traveling wave likely to occur at the end of the guide path. To this purpose, the guide path has at least one portion in the form of a spiral segment (11, 12), which is connected to another portion of the guide path in the form of a loop (13). Gain in the antenna's reflection coefficient can be obtained in this manner, which is effective in particular near a lower frequency limit of a transmission band of the antenna.

An antenna (100) for emitting radiation from at least one electromagnetic traveling wave which propagates along a guide path is designed to reduce reflection of the traveling wave likely to occur at the end of the guide path. To this purpose, the guide path has at least one portion in the form of a spiral segment (11, 12), which is connected to another portion of the guide path in the form of a loop (13). Gain in the antenna's reflection coefficient can be obtained in this manner, which is effective in particular near a lower frequency limit of a transmission band of the antenna.

A collar-mountable antenna for transmitting and receiving signals in a downhole environment, in at least some embodiments, comprises a bobbin having an inner surface and an outer surface, each of the inner and outer surfaces defining multiple slots, conductive wire disposed within the multiple slots on the outer surface of the bobbin, and ferrite disposed within the multiple slots on the inner surface of the bobbin.

A collar-mountable antenna for transmitting and receiving signals in a downhole environment, in at least some embodiments, comprises a bobbin having an inner surface and an outer surface, each of the inner and outer surfaces defining multiple slots, conductive wire disposed within the multiple slots on the outer surface of the bobbin, and ferrite disposed within the multiple slots on the inner surface of the bobbin.

A GNSS-UHF antenna, including a first PCB having four sets of radiating elements, a second PCB below the first PCB, a metal plate below the second PCB, which form a quadrifilar helical antenna for operating with right-hand circularly polarized GNSS signals and simultaneously form a monopole antenna for operating with linearly polarized UHF signals; for each set of radiating elements, a corresponding downward-extending conductor connected to the second PCB at a first end and connected to the set of radiating elements at a second end through an inductor; a first coaxial cable outputting GNSS signals; the first cable includes a partial loop between the second shield and the metal plate; and a second cable outputting the UHF and its braiding connected to the metal plate.

A GNSS-UHF antenna, including a first PCB having four sets of radiating elements, a second PCB below the first PCB, a metal plate below the second PCB, which form a quadrifilar helical antenna for operating with right-hand circularly polarized GNSS signals and simultaneously form a monopole antenna for operating with linearly polarized UHF signals; for each set of radiating elements, a corresponding downward-extending conductor connected to the second PCB at a first end and connected to the set of radiating elements at a second end through an inductor; a first coaxial cable outputting GNSS signals; the first cable includes a partial loop between the second shield and the metal plate; and a second cable outputting the UHF and its braiding connected to the metal plate.