摘要:
A variable RF filter (102) which includes one or more filter elements (104,106). The filter elements (104,106) can be formed from a structure selected from the group consisting of stripline, microstrip, and buried microstrip. A fluid dielectric (108) and a fluid control system (150) for selectively moving the fluid dielectric from a first position to a second position are provided. In the first position, the fluid dielectric (108) is electrically and magnetically coupled to the filter elements (104,106) to produce a first filter response. In the second position, the fluid dielectric (108) is electrically and magnetically decoupled from the filter elements (104,106) to produce a second filter response distinct from the first filter response. The first position can be defined by a bounded region located adjacent to the filter elements (104,106) and the second position is defined by a fluid storage reservoir (170).
摘要:
A selectable sub-reflector antenna system (100) comprises a main reflector unit (101), a sub-reflector unit (111) disposed apart from the main reflector unit and having at least one cavity (116), and at least one fluidic dielectric having a permittivity and a permeability. The system further comprises at least one composition processor (104) adapted for dynamically changing a composition of the fluidic dielectric to vary at least one among the permittivity and permeability in at least one cavity among a plurality of cavities and a controller (102) for controlling the composition processor to selectively vary at least one among permittivity and permeability in at least one cavity in response to a control signal (105).
摘要:
The present invention relates to a variable tuned transmission line stub (102). The transmission line stub (102) has an input (104) at one end, an electrical length, and a termination at an opposing end (122). A fluid dielectric (108) is electrically and magnetically coupled to the transmission line stub (102) in a first position to produce a first tuned response. The fluid dielectric (108) is electrically and magnetically decoupled from the transmission line stub (102) in a second position to produce a second tuned response which is distinct from the first tuned response.
摘要:
An electromagnetic horn antenna (100). The antenna can include a horn housing having a throat portion (102), a tapered portion (106, 104) and an aperture 108. At least one cavity structure (142, 144, 138) can be provided within the horn housing. The cavity structure can include at least one wall (138) formed of a dielectric material. A conductive fluid (136) and a fluid control system (103) can be provided. The fluid control system can control a volume and a position of the conductive fluid contained within the cavity structures for dynamically modifying at least one electrical characteristic of the electromagnetic horn antenna.
摘要:
A waveguide apparatus (100) and method (300) of mode control can include a waveguide structure (102) defining at least one cavity (116) disposed within the waveguide apparatus. The waveguide apparatus has at least a first operational state in which at least one cavity is filled with a conductive fluid (126) and at least a second operational state in which at least one cavity is purged of the conductive fluid. The waveguide apparatus can further include at least one composition processor (150) adapted for changing at least one among an electrical characteristic and a physical characteristic of the waveguide apparatus by manipulating a volume of the conductive fluid and a controller (172) for controlling the composition processor in response to a transmission line mode control signal (174).
摘要:
A reflector antenna system may include at least one antenna reflector having an arcuate shape and defining an antenna beam, a feed device spaced apart from the at least one antenna reflector, and a phased array antenna positioned in the antenna beam between the at least one antenna reflector and the feed device. More particularly, the phased array antenna may include a substrate and a plurality of back-to-back pairs of first antenna elements carried by the substrate and configured for defining at least one feed-through zone for the antenna beam. The phased array antenna may further include a plurality of back-to-back pairs of second antenna elements carried by the substrate and defining at least one active beamsteering zone for the antenna beam.
摘要:
A reflector antenna system may include an arc-shaped antenna reflector defining a first antenna beam, and a phased array antenna positioned in the first antenna beam including first and second arrays of antenna elements coupled together in back-to-back relation. The first array may face the antenna reflector, and the second array may face away from it. A controller switchable between a reflecting mode and a direct mode may be connected to the arrays. The controller, when in the reflecting mode, may cause back-to-back pairs of first antenna elements from the arrays to define a feed-through zone for the first antenna beam, and cause second antenna elements in the first array to define a first active zone for the first antenna beam. Furthermore, when in the direct mode, the controller may cause antenna elements in the second array to define a second active zone for a second antenna beam.
摘要:
A redirecting feedthrough lens antenna system may include first and second phased array antennas coupled together in back-to-back relation. More particularly, the first and second phased array antennas may include respective first and second arrays of dipole antenna elements thereon, wherein each dipole antenna element may include a medial feed portion and a pair of legs extending outwardly therefrom. The system may also include a respective phase shifter connected between each pair of back-to-back dipole antenna elements of the first and second dipole antenna arrays. Furthermore, a controller may be included for cooperating with the phase shifters to cause a signal received by the first phased array antenna at a first angle to be transmitted from the second phased array antenna at a redirected second angle different from the first angle.
摘要:
A reflector antenna system may include at least one antenna reflector having an arcuate shape and defining an antenna beam, and a phased array antenna positioned in the antenna beam. More particularly, the phased array antenna may include a substrate and a plurality of back-to-back pairs of first antenna elements carried by the substrate and configured for defining at least one feed-through zone for the antenna beam. Moreover, the phased array antenna may further include a plurality of second antenna elements carried by the substrate and defining at least one active zone for the antenna beam.