摘要:
A phase delay line (110). The phase delay line can include an RF transmission line (111) and a fluid channel (109) having a serpentine configuration. The transmission line can be coupled to a solid dielectric substrate material (102), for example a substrate formed from a low temperature co-fired ceramic material. The fluid channel can be coupled to the RF transmission line along at least a portion of a length of the transmission line. A phase delay of the RF transmission line can be selectively varied by adjusting a distribution of the fluidic dielectric (130) present within the fluid channel. Similarly, the phase delay of the RF transmission line also can be maintained constant as an operational frequency of the RF transmission line is varied.
摘要:
An antenna can comprise a conductive reflecting surface (204) and a plurality of cells (202) disposed over the conductive reflecting surface. The plurality of cells can be formed from a solid dielectric material such as a low temperature cofired ceramic. Each cell can define a cavity for containing at least a fluid dielectric (406). One or more fluid processors (404, 424) independently vary a volume of the first fluid dielectric in the plurality of cells for producing a redirected RF beam at a selected angle relative to an incident RF signal impinging on the conductive reflecting surface.
摘要:
A circuit for processing radio frequency signals that includes an adjustable transmission line stub (104). The adjustable transmission line stub (104) has an input (106) at one end, an electrical length and a termination (112). The circuit also includes a signal return conductor (124) and at least one fluid conduit (114) extending from the transmission line stub (104) to the signal return conductor (124). A fluid control system (150) is provided for selectively moving a conductive fluid (126) from a first position to a second position. The fluid control system is responsive to a control signal (174) for selectively moving the conductive fluid (126) between the first and second position. The fluid control system (150) can include a pump (154, 158, 156) for moving the conductive fluid (126) between the first position and the second position.
摘要:
A phased array antenna (100) having a frequency selective surface comprises a substrate (125) and an array of antenna elements (140) thereon. Each antenna element comprises a medial feed portion (42) and a pair of legs (49) extending outwardly therefrom. Adjacent legs of adjacent antenna elements include respective spaced apart end portions (51). The antenna further comprises at least one fluidic dielectric residing within at least one cavity (170) within the substrate and arranged between a plane where the array of dipole antenna elements reside and a ground plane (150), at least one composition processor (104) adapted for dynamically changing a composition of said fluidic dielectric, and a controller (102) for controlling the composition processor to selectively vary at least one of a permittivity and a permeability of the fluidic dielectric in at least one cavity in response to a control signal (105).
摘要:
The invention concerns an antenna system (100) with dynamically adjustable ground plane spacing. The system includes at least one antenna radiating element (106, 108) and a first conductive ground plane (110, 120) spaced from radiating element (106, 108). The first conductive ground plane is comprised of a dielectric structure (104) containing a conductive fluid (120).
摘要:
A waveguide attenuator apparatus (100) includes a variable waveguide attenuator (102) having at least one waveguide attenuator cavity (109) and a fluidic dielectric (108) having a loss tangent, a permittivity and a permeability at least partially disposed within the waveguide attenuator cavity. At least one composition processor (101) is included and adapted for dynamically changing a composition or volume of the fluidic dielectric to vary the loss tangent, the permittivity and/or the permeability. A controller (136) is provided for controlling the composition processor to selectively vary the loss tangent, the permittivity and/or the permeability in response to a waveguide attenuator control signal (137). In one arrangement, the permittivity and permeability can be varied concurrently.
摘要:
A phased array antenna (100) having a frequency selective surface comprises a substrate (125) and an array of antenna elements (140) thereon. Each antenna element comprises a medial feed portion (42) and a pair of legs (49) extending outwardly therefrom. Adjacent legs of adjacent antenna elements include respective spaced apart end portions (51). The antenna further comprises at least one fluidic dielectric residing within at least one cavity (170) within the substrate and arranged between a plane where the array of dipole antenna elements reside and a ground plane (150), at least one composition processor (104) adapted for dynamically changing a composition of said fluidic dielectric, and a controller (102) for controlling the composition processor to selectively vary at least one of a permittivity and a permeability of the fluidic dielectric in at least one cavity in response to a control signal (105).
摘要:
A variable phase delay line (100). The variable phase delay line (100) can include an RF transmission line (102) and a fluid channel (130) having a serpentine configuration. The fluid channel (130) can be coupled to the RF transmission line (102) along at least a portion of a length of the transmission line (102). The variable phase delay line (100) also can include at least one fluid control system (150) for adding and removing the fluidic dielectric (132) to the fluid channel (130) in response to a phase delay control signal (122) to selectively vary a phase delay of the RF transmission line (102). The fluidic dielectric (132) can have a permeability and a permittivity selected for maintaining a constant characteristic impedance along an entire length of the RF transmission line (102).
摘要:
A transmission line transformer (102) having an electrical length and a fluid dielectric (108). A fluid control system (150) is also provided for selectively moving the fluid dielectric (108) from a first position to a second position. In the first position, the fluid dielectric (108) is electrically and magnetically coupled to the transmission line transformer (102) to produce a first impedance transformation. In the second position, the fluid dielectric is electrically and magnetically decoupled from the transmission line transformer (102) to produce a second impedance transformation distinct from the first impedance transformation. The fluid control system (150) can be responsive to a control signal (174) and can include a pump (154) for moving the fluid dielectric from the first position to the second position.
摘要:
The invention concerns a multi-mode electromagnetic horn antenna that can operate over two or more distinct bands of frequencies. The horn (100) includes a throat portion (102) and an aperture (108) disposed at an end of the horn (100) opposed to the throat portion (102). A flared section (104, 106) is disposed between the throat portion and the aperture. At least one dimension of the flared section can increase in size along an axial length of the horn defined between the throat portion (102) and the aperture (108). Further, a dielectric load (103) can be disposed within the throat portion (102). The dielectric load is advantageously comprised a fluid dielectric (103).