摘要:
Antennas and methods for controlling antennas for producing electromagnetic radiation in a desired direction over a wide range of wavelengths. A current distribution is controlled in one or more conductive radiating elements of an antenna to form, at every wavelength within a pattern wavelength range, an antenna radiation pattern having a peak in a direction substantially orthogonal to a length of an elongated conductive radiating element or elements. By careful control of the current distribution, the pattern wavelength range is made exceptionally broad. In the case of a dipole antenna, the pattern wavelength can range from about ⅓l to at least about 8l, where l is an approximate combined length of a pair of elongated elements forming a dipole antenna. Alternatively, in the case of a monopole antenna, the pattern wavelength range can extend from about ⅙l to at least about 4l, where l is an approximate overall length of the monopole antenna.
摘要:
Antennas and methods for controlling antennas for producing electromagnetic radiation in a desired direction over a wide range of wavelengths. A current distribution is controlled in one or more conductive radiating elements of an antenna to form, at every wavelength within a pattern wavelength range, an antenna radiation pattern having a peak in a direction substantially orthogonal to a length of an elongated conductive radiating element or elements. By careful control of the current distribution, the pattern wavelength range is made exceptionally broad. In the case of a dipole antenna, the pattern wavelength can range from about ⅓l to at least about 8l, where l is an approximate combined length of a pair of elongated elements forming a dipole antenna. Alternatively, in the case of a monopole antenna, the pattern wavelength range can extend from about ⅙l to at least about 4l, where l is an approximate overall length of the monopole antenna.
摘要:
A fastening device (200) for releasably securing an antenna assembly (100) on at least one garment (15) of a user (10) is provided. The antenna assembly (100) is part of a portable communication system (50) which includes a portable communication device (125) that is also worn on the garment (15) of the user (10). The fastening device (200) is comprised of a body portion (205) and an elongated receiver portion (210). The elongated receiver portion (210) defines an elongated channel (211) and a pair of resilient undulations (215, 216) which define an elongated opening (212), The pair of resilient undulations (215, $16) serve to guide a segment (110a) of the antenna assembly (100) through the elongated opening (212) and into the elongated channel (211). Once the segment (110a) is urged into the elongated channel (211), the undulations (215, 216) return to the normal position thereby securing the segment (110a) in the elongated channel (211). The fastening device (200) is attached to a loop (16) on the at least one garment (15) of the user (10) with straps using hook and loop fasteners, a pair of slide keeper clips, or a carabineer clip.
摘要:
An antenna system (100, 500) for a portable communication device (112) is provided. The antenna system is comprised of a retaining structure (204), an antenna flap (206), and a first pivot coupling (212). The retaining structure provides a means for securing the retaining structure to the portable communication device. The antenna flap includes an antenna structure (302). The antenna structure is comprised of an antenna radiating element (600) and/or an antenna impedance matching network (652). The first pivot coupling pivotally connects the antenna flap to the retaining structure. The first pivot coupling is configured to allow the antenna flap to pivot freely on the first pivot coupling responsive to a force of gravity acting on the antenna flap. The retaining structure is configured as a holster in which the portable communication device can be disposed.
摘要:
A method and apparatus for reducing a length of an antenna (402) involves an arrangement which includes an orthogonal antenna feed. An antenna includes a radiating element (404) with a length extending along an axis (418). The orthogonal feed arrangement permits recovery of a portion of the spatial volume comprising the antenna which is normally used for antenna matching circuitry (406). An end portion of the radiating element is chosen to be helically shaped and includes an RF feed gap. The RF feed gap is coupled to a matching network which includes elongated conductors (412). The matching circuitry is positioned so that the elongated conductors are adjacent to the first end portion and extend in a direction aligned with the axis, but orthogonal to the coils forming the helically shaped end portion.
摘要:
Antenna assembly 100 to be worn by a user includes a low-band dipole antenna (310) and at least one high band dipole antenna (312, 612). The high-band dipole antenna is comprised of a high-band dipole feed (102, 602) interposed at a location along a length of a low-band dipole element (105, 110). The high-band dipole feed divides the first low-band dipole element into a first high-band dipole element (128) and a second high-band dipole element (130). One of the high-band dipole elements (130) is formed as a flexible electrically conductive sleeve. An RF control device (308) is provided for selectively directing RF energy in a high-band to the high-band dipole feed (102), and for selectively directing RF energy in a low-band to the low-band dipole feed (202). A transmission line (113) extends from the RF control device (308) to the high-band dipole feed (102).
摘要:
A compact SATCOM antenna is provided having an LNA integrated into the radiator body which may be mounted to a handheld satellite radio and articulated with respect to the radio to assume a wide variety of positions for communication with a geosynchronous satellite.
摘要:
A method and apparatus for reducing a length of an antenna (402) involves an arrangement which includes an orthogonal antenna feed. An antenna includes a radiating element (404) with a length extending along an axis (418). The orthogonal feed arrangement permits recovery of a portion of the spatial volume comprising the antenna which is normally used for antenna matching circuitry (406). An end portion of the radiating element is chosen to be helically shaped and includes an RF feed gap. The RF feed gap is coupled to a matching network which includes elongated conductors (412). The matching circuitry is positioned so that the elongated conductors are adjacent to the first end portion and extend in a direction aligned with the axis, but orthogonal to the coils forming the helically shaped end portion.
摘要:
An antenna system (100, 500) for a portable communication device (112) is provided. The antenna system is comprised of a retaining structure (204), an antenna flap (206), and a first pivot coupling (212). The retaining structure provides a means for securing the retaining structure to the portable communication device. The antenna flap includes an antenna structure (302). The antenna structure is comprised of an antenna radiating element (600) and/or an antenna impedance matching network (652). The first pivot coupling pivotally connects the antenna flap to the retaining structure. The first pivot coupling is configured to allow the antenna flap to pivot freely on the first pivot coupling responsive to a force of gravity acting on the antenna flap. The retaining structure is configured as a holster in which the portable communication device can be disposed.
摘要:
Antenna assembly 100 to be worn by a user includes a low-band dipole antenna (310) and at least one high band dipole antenna (312, 612). The high-band dipole antenna is comprised of a high-band dipole feed (102, 602) interposed at a location along a length of a low-band dipole element (105, 110). The high-band dipole feed divides the first low-band dipole element into a first high-band dipole element (128) and a second high-band dipole element (130). One of the high-band dipole elements (130) is formed as a flexible electrically conductive sleeve. An RF control device (308) is provided for selectively directing RF energy in a high-band to the high-band dipole feed (102), and for selectively directing RF energy in a low-band to the low-band dipole feed (202). A transmission line (113) extends from the RF control device (308) to the high-band dipole feed (102).