Abstract: A wireless device including multiple counterpoises or ground planes is provided. The wireless device may provide improved multiple input multiple output (MIMO) communication capability through the use of the multiple counterpoises. Multiple counterpoises of the wireless device may be galvanically isolated from one another. Multiple counterpoises may each be coupled to separate antenna elements.

Abstract: A wireless device includes an antenna structure having at least one parallel resonance element and a plurality of serial resonance components. The at least one parallel resonance element may be configured to radiate in at least one frequency. The plurality of serial resonance components may be configured to radiate in a plurality of frequencies. The antenna structure may further include a distributed feed element configured to couple to the parallel resonance element and the serial resonance components and serve as a radiofrequency signal feed. The wireless device may include two or more similar antenna structures.

Abstract: A multi-feed antenna assembly including a ground element lying in a plane, a first antenna element coupled to the ground element and having a projection on the plane, a first feed for feeding the first antenna element, a second antenna element coupled to the ground element and having a projection on the plane, the projection of the second antenna element being at least partially encompassed by the projection of the first antenna element and a second feed for feeding the second antenna element.

Abstract: A wireless device including multiple counterpoises or ground planes is provided. The wireless device may provide improved multiple input multiple output (MIMO) communication capability through the use of the multiple counterpoises. Multiple counterpoises of the wireless device may be galvanically isolated from one another. Multiple counterpoises may each be coupled to separate antenna elements.

Abstract: A wireless device including at least one parallel resonance element and a plurality of serial resonance components is provided. The at least one parallel resonance element may be configured to radiate in at least one frequency. The plurality of serial resonance components may be configured to radiate in a plurality of frequencies. The device may further include a distributed feed element configured to couple to the parallel resonance element and the serial resonance components and serve as a radiofrequency signal feed.

Abstract: A multiband antenna including a feed point, a helical radiating element galvanically connected to and fed by the feed point, the helical radiating element resonating in a Very High Frequency range and an elongate radiating element arranged coaxially within the helical radiating element and galvanically connected to and fed by the feed point, the elongate radiating element extending along only a portion of the helical radiating element, the elongate radiating element having a first resonant frequency and a second resonant frequency, the elongate radiating element operating as a quarter-wavelength monopole at the first resonant frequency and as an eighth-wavelength monopole at the second resonant frequency.

Abstract: A antenna for a wireless device is provided. The antenna may include a dielectric substrate, a counterpoise disposed on the dielectric substrate, a first conductive element electrically connected to the counterpoise, and a second conductive element electrically connected to a feed point. The first conductive element may form at least a portion of a radiating loop resonant at a first frequency, and the second conductive element may form at least a portion of a radiating spur resonant at a second frequency higher than the first frequency. The antenna may further include a conductive frame constituting at least a portion of the radiating loop or the radiating spur.

Abstract: A wireless device including a conductive chassis and a conductive coupling element is provided. The conductive coupling element may be connected to the conductive chassis and may cooperate with the conductive chassis to form a slit. An elongate feed element may be disposed within the slit. The coupling element may be configured to activate at least a portion of the conductive chassis to enable the chassis to operate as an antenna.

Abstract: An antenna system including a signal source, at least one antenna coupled to the signal source, a matching circuit connected to the signal source at a first port and to the at least one antenna at a second port and operative to match the at least one antenna to the signal source, the matching circuit having a characteristic impedance with respect to the first port and the second port, real and imaginary parts of the characteristic impedance not being defined by the Hilbert transform.

Abstract: A multi-feed antenna assembly including a ground element lying in a plane, a first antenna element coupled to the ground element and having a projection on the plane, a first feed for feeding the first antenna element, a second antenna element coupled to the ground element and having a projection on the plane, the projection of the second antenna element being at least partially encompassed by the projection of the first antenna element and a second feed for feeding the second antenna element.

Abstract: A dual branch antenna is provided. The dual branch antenna may include a continuous conductive element divided into first and second branches. Each branch may be configured to form at least a portion of an antenna structure. Antenna structures thus formed may be configured to radiate in at least two different frequencies.

Abstract: A wireless device includes an antenna structure having at least one parallel resonance element and a plurality of serial resonance components. The at least one parallel resonance element may be configured to radiate in at least one frequency. The plurality of serial resonance components may be configured to radiate in a plurality of frequencies. The antenna structure may further include a distributed feed element configured to couple to the parallel resonance element and the serial resonance components and serve as a radiofrequency signal feed. The wireless device may include two or more similar antenna structures.

Abstract: A multiband antenna including a feed point, a helical radiating element galvanically connected to and fed by the feed point, the helical radiating element resonating in a Very High Frequency range and an elongate radiating element arranged coaxially within the helical radiating element and galvanically connected to and fed by the feed point, the elongate radiating element extending along only a portion of the helical radiating element, the elongate radiating element having a first resonant frequency and a second resonant frequency, the elongate radiating element operating as a quarter-wavelength monopole at the first resonant frequency and as an eighth-wavelength monopole at the second resonant frequency.

Abstract: A wideband antenna, including a radio-frequency connector providing a radio-frequency current, an elongate radiating element galvanically connected to the radio-frequency connector, the elongate radiating element forming a galvanic radio-frequency current path for the radio-frequency current and at least one generally cylindrical conductive element enclosing at least a portion of the elongate radiating element and forming a capacitive radio-frequency current path for the radio-frequency current.

Abstract: A antenna for a wireless device is provided. The antenna may include a dielectric substrate, a counterpoise disposed on the dielectric substrate, a first conductive element electrically connected to the counterpoise, and a second conductive element electrically connected to a feed point. The first conductive element may form at least a portion of a radiating loop resonant at a first frequency, and the second conductive element may form at least a portion of a radiating spur resonant at a second frequency higher than the first frequency. The antenna may further include a conductive frame constituting at least a portion of the radiating loop or the radiating spur.

Abstract: A wireless device including at least one parallel resonance element and a plurality of serial resonance components is provided. The at least one parallel resonance element may be configured to radiate in at least one frequency. The plurality of serial resonance components may be configured to radiate in a plurality of frequencies. The device may further include a distributed feed element configured to couple to the parallel resonance element and the serial resonance components and serve as a radiofrequency signal feed.

Abstract: A dual branch antenna is provided. The dual branch antenna may include a continuous conductive element divided into first and second branches. Each branch may be configured to form at least a portion of an antenna structure. Antenna structures thus formed may be configured to radiate in at least two different frequencies.

Abstract: A wireless device including a conductive chassis and a conductive coupling element is provided. The conductive coupling element may be connected to the conductive chassis and may cooperate with the conductive chassis to form a slit. An elongate feed element may be disposed within the slit. The coupling element may be configured to activate at least a portion of the conductive chassis to enable the chassis to operate as an antenna.

Abstract: A portable radio device including a housing, an antenna at least partially embedded in the housing and operative to radiate in at least the VHF range and a feed arrangement for feeding the at least partially embedded antenna.

Abstract: An antenna system including a signal source, at least one antenna coupled to the signal source, a matching circuit connected to the signal source at a first port and to the at least one antenna at a second port and operative to match the at least one antenna to the signal source, the matching circuit having a characteristic impedance with respect to the first port and the second port, real and imaginary parts of the characteristic impedance not being defined by the Hilbert transform.