摘要:
Ring-shaped resonant elements include respectively conductor lines 2a, 2b, and 2c each formed on a substrate 1 along a full one turn of circumferential length of a ring. Each of the conductor lines 2a, 2b, and 2c has two end portions which additionally extend and which are located such that they closely adjoin each other in a width direction. The respective ring-shaped resonant elements are disposed in a concentric fashion. Capacitive parts are formed in areas in which two ends of respective conductor lines are located in close proximity to each other, and the other parts of the respective conductor lines function as inductive parts. Each conductor line operates as a half-wave transmission line whose both ends are electrically open. It is not needed to form a ground electrode on a surface of the substrate opposite to the surface on which the conductor lines are formed. Thus, a resonator can be formed using a very small number of constituent elements. A resonator, a filter, a duplexer, and a communication apparatus having a small size and a high conductor Q-factor can be produced at reasonably low cost.
摘要:
Multi-stage electric filters with improved intermodulation-distortion characteristics and a method for designing such electric filters is provided. In general, the invention may include a multi-resonator electric filter in which one or more of the resonators have been intentionally designed to have a different IP and/or Q than the other resonators in the electric filter. In one case, the electric filters include a 4-resonator Chebyshev narrow pass-band filter with at least the first resonator (1105) having a Q and/or IP different from at least one other resonator (1110) in the filter. The filter thereby has improved IMD power over conventional designed filters while maintaining high Q. In a preferred embodiment the filter may include a superconducting material. The relative Q and IP of the respective resonators in the improved filter may depend on the relative strength of in-band and out-of-band signals. The performance and cost of the electric filter may be optimized by designing the filter to have a relative Q and IP required by the particular application.
摘要:
A tunable filter having a fixed substrate (20), first and second plates (10, 15) comprising a high temperature superconducting material is fixed on the substrate. A movable substrate (35) includes a mechanical driver (70) attached to the fixed and movable substrates. A floating plate (30) of a high temperature superconducting material is fixed to the movable substrate. The floating plate and the first and second plates are arranged to define a gap (50) therebetween, and wherein the gap is varied by length changes effected by the mechanical driver.
摘要:
A multilayer filter comprising a first dielectric layer (2101a) having a first shield electrode provided on one major surface, a second dielectric layer (b) having a resonator electrode provided on the one major surface, a third dielectric layer (2101c) having a bond electrode provided oppositely to a part of the resonator electrode on the one major surface, a fourth dielectric layer (2101d) having a second shield electrode provided on the one major surface, a fifth dielectric layer (2101e) where at least the one major surface is exposed to the outside, and a ground electrode (2108) provided on the other major surface of the first dielectric layer and/or the one major surface of the fifth dielectric layer, characterized in that the first ground electrode and the first shield electrode are connected electrically through a via hole (2109) made in the first dielectric layer.
摘要:
A circuit is provided wherein the electrical properties of the circuit are varied by a magnetic actuator. The circuit includes a fixed substrate (10) and a movable substrate (15). The magnetic actuator comprises magnetic drivers (30) on an upper surface of fixed substrate (10) that is substantially overlapped by HTS reaction plates (35) on the lower surface of movable substrate (15). A tuning current applied through a continuous strip of HTS material (51) in the magnetic driver induces a repulsive magnetic force in the HTS reaction plate, thereby causing the movable substrate (15) to move with respect to the fixed substrate (10).
摘要:
A printed circuit for processing radio frequency signals. The printed circuit includes a substrate. The substrate can be a meta material and can include at least one dielectric layer. The dielectric layer can have a first set of dielectric properties over a first region and a second set of dielectric properties over a second region. The dielectric permittivity and/or magnetic permeability of the second set of dielectric properties can be different than the first set of dielectric properties. The printed circuit also can include a single port resonant line and a ground coupled to the substrate. The dielectric properties can be controlled to adjust the size of the resonant line. The dielectric properties also can be controlled to adjust an impedance, quality factor and/or capacitance on the resonant line. Resonant characteristics of the resonant line can be distributed through the substrate.
摘要:
The present invention comprises baluns 2a, 2b which convert balanced line signals and unbalanced line signals mutually, and filters 3a, 3b which are electrically connected to the baluns 2a, 2b and pass or attenuate the predetermined frequency bands. Electrode layers 15a-22a, 25a, 41, 42, 43 which compose the electrode patterns of the baluns 2a, 2b and the filters 3a, 3b, and the dielectric layers 30-39 are integrally stacked.