摘要:
A variable true time delay line (100) includes an RF transmission line (110) and at least one fluidic delay unit (108). The fluidic delay unit includes a fluidic dielectric contained in a cavity (109) and coupled to the RF transmission line (110) along at least a portion of a length thereof. At least one pump is provided for adding and removing the fluid dielectric to the cavity (109) in response to a time delay control signal. A propagation delay of the RF transmission line is selectively varied by adding and removing the fluid dielectric from the cavity.
摘要:
A continuously variable true time delay line (100) and method for producing a time delay. The true delay line (100) includes an RF transmission line (110) and at least a first fluidic dielectric (130) contained in a cavity (109) coupled to the RF transmission line along at least a first length thereof. One or more variable displacement fluid processors (120) are provided for changing a distribution of the fluid dielectric (130) in the cavity (109) in response to a time delay control signal (137). The propagation delay of the line is selectively varied by changing the distribution of the fluid dielectric in the cavity.
摘要:
Method and apparatus for producing a variable delay for an RF signal. The method can include the step of propagating the RF signal along an RF transmission line, coupling a fluidic dielectric to the RF transmission line, and dynamically changing a composition of the fluidic dielectric to selectively vary its permittivity in response to a time delay control signal. The method can also include the step of dynamically changing a composition of the fluidic dielectric to vary its permeability. The permittivity and the permeability can be varied concurrently in response to the time delay control signal. In a preferred embodiment the method can include selectively varying the permeability concurrently with the permittivity to maintain a characteristic impedance of the transmission line approximately constant.
摘要:
Method for controlling an input impedance of an antenna (100). The method can include the steps of coupling RF energy from an input RF transmission line (106) to an antenna radiating element (102) through an aperture (112) defined in a ground plane (110). For example, the aperture (112) can be a slot and the radiating element (102) can be a patch type element. The input impedance can thereafter be controlled by selectively varying a volume or a position of a conductive fluid (128) disposed in a predetermined region between the RF transmission line and the antenna radiating element. The volume of conductive fluid (128) can be automatically varied in response to at least one control signal (132).
摘要:
A tunable resonant system (100) and a method for a varying the resonant characteristics of a resonant cavity (102). The resonant cavity is enclosed by a conductive material that has at least one aperture (104) for coupling the resonant cavity to an RF signal propagating in a circuit device (160). A conductive fluid (108) having a permeability is at least partially disposed within the resonant cavity (102) or a plurality of subcavities (250, 252) within the resonant cavity (202). A dielectric barrier (105) can be provided within the aperture to prevent the conductive fluid from escaping the resonant cavity. A composition processor (101) is adapted for dynamically changing a composition or volume of the conductive fluid to vary or maintain constant a center frequency, a bandwidth, a quality factor (Q) or an impedance of the resonant cavity.
摘要:
A tunable resonant system comprising a resonant cavity apparatus including at least one cavity wall (150, 151, 152, 153, 154, 155) made of a conductive material and arranged to form a resonant cavity (102), and a method for varying the resonant characteristics of the tuned resonant cavity (102). The conductive material can be steel, brass, copper, ferrite and/or Iron-nickel alloy. At least one slot (104) can be provided in a wall (150, 151, 152, 153, 154, 155) of the resonant cavity for coupling energy in and out of the resonant cavity. A fluidic dielectric (108) is disposed within the resonant cavity (102). A fluid control system (101) can be provided for selectively varying a composition of the fluidic dielectric (108) to dynamically modify a frequency response of the resonant cavity (102).
摘要:
A dielectric lens antenna (100) includes a dielectric lens unit (101) having a plurality of cavities (106) and at least one fluidic dielectric having a permittivity and a permeability. The antenna further includes at least one composition processor (104) adapted for dynamically changing a composition of the fluidic dielectric to vary at least one of among the permittivity and the permeability in any of the plurality of cavities and a controller (102) for controlling the composition processor to selectively vary at least one of the permittivity and the permeability in at least one of the plurality of cavities 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:
A circulator (100) is comprised of a transmission line three port Y junction (104). At least one cylindrical cavity structure (113, 115) is disposed adjacent to the Y junction and contains a ferromagnetic fluid (114). One or more magnets (112) are provided for applying a magnetic field (118) to the ferromagnetic fluid and the Y junction in a direction normal to a plane defined by said Y junction. A composition processor (301) is provided for dynamically changing a composition of the ferromagnetic fluid in response to a control signal to vary the permittivity and permeability of the ferromagnetic fluid.
摘要:
An RF switch (100) which includes a waveguide structure (102) having at least a first (104) and second port (106). The RF switch (100) also includes a dielectric structure defining at least a first cavity (136) disposed at a juncture between the first and second ports. The dielectric structure can define a plurality of elongated fluid cavities (136) at the juncture extending between opposing walls (116, 118) of the waveguide structure (102). The RF switch (100) also can include a fluid control system (150) that moves a conductive fluid (138) into the first cavity (136) in a first operational state and at least partially purges the conductive fluid (136) from the first cavity (138) in a second operational state. A conductive path can be provided between the conductive fluid and at least one wall (1116, 118) of the waveguide structure (102).