30 results about "Transmission line resonator" patented technology

A planar filter has first and second U-shaped open transmission line resonators (103, 105) and a crank-shaped open transmission line resonator (104), so that it is possible to decrease an area to be virtually occupied by the filter on a dielectric substrate (110) and enhance the attenuation characteristic.

Methods for spatially resolved spin resonance detection in a sample of material, with a resolution as small as 0.5 μ m –1 mm. In one embodiment, a coupler having at least one pair of degenerate orthogonal modes provides an evanescent input signal along one coupler axis to the sample, to which a magnetic field is applied, and senses a spin interaction signal along another coupler axis. In another embodiment, an evanescent input signal is applied to the sample along one of two identical transmission line resonators, and a difference of the two resonator signals provides a spin interaction signal. In another embodiment, a polarized laser beam provides an evanescent input signal to the sample, and the spin interaction signal is sensed according to a second beam polarization direction. Certain ferromagnetic or ferrimagnetic molecules, such as YIG, can be used to tag selected chemical and biological molecules, using spatially resolved spin resonance detection for interrogation.

A high frequency oscillator suitable for implementing a push-push oscillator, a push-pull oscillator, and a four-phase push-push oscillator comprises a transmission line resonator, two active devices for oscillation connected to two resonant wave points, respectively, located on the transmission line resonator in an opposite phase relationship to each other, and a combiner line connected to an electric symmetric point of the transmission line resonator. The respective active devices constitute two oscillation systems, respectively, which share the transmission line resonator as a high frequency resonator. The combiner line combines outputs from the respective oscillation systems to generate a high frequency output.

A interdigital, slow-wave coplanar transmission line resonator utilizing a coupler. Sections of interdigital, slow-wave coplanar transmission lines having lengths of an integral number of quarter waves act as resonators. In one embodiment shorted transmission lines proximately located to the resonators electromagnetically coupled to the resonators to provide input and output ports to the resonators. In another embodiment, transmission lines are connected by taps to the resonators to provide input and output ports.

A transmission line type resonator having a low-loss characteristic. In order to realize the low-loss characteristic, the transmission line type resonator in the present invention includes a laminate body formed of a plurality of dielectric sheets, a transmission line of complex right hand left hand system disposed between the plurality of dielectric sheets, and an external connection terminal disposed at the end face of the transmission line type resonator and connected with the transmission line of complex right hand left hand system.

A microwave frequency tunable filtering balun is provided. The microwave frequency tunable filtering balun comprises a first microwave split ring transmission line resonator and a second microwave split ring transmission line resonator arranged in a bilaterally symmetrical manner, a fourth variable capacitor and a fifth variable capacitor of same parameters. It combines two functions of balun and tunable bandpass filter (BPF) into one circuit, resulting in a compact design. The balun characteristic and frequency-tuning mechanism are investigated, and the design equations are derived.

The invention provides a miniaturized composite right / left-handed structure broadband filter. The miniaturized composite right / left-handed broadband filter comprises a back copper coating layer, a dielectric substrate and a front circuit, wherein the back copper coating layer, the dielectric substrate and the front circuit are arranged in sequence from bottom to top, the front circuit comprises five composite right / left-handed transmission line resonators, each composite right / left-handed transmission line resonator comprises an interdigital part, a straight microstrip line, a through hole welding disc and a metallized through hole, the five composite right / left-handed transmission line resonators are vertically arranged in parallel, the interdigital parts and the straight microstrip lines of every two adjacent resonators are alternately arranged up and down, and two microstrip lines are respectively connected to the straight microstrip lines of the resonators on the left and right ends so as to be used as input and output ports. The miniaturized composite right / left-handed structure broadband filter contains the novel composite right / left-handed transmission line resonators, and compared with a traditional resonator, the novel composite right / left-handed transmission line resonators are compact and small; the interdigital parts and the straight microstrip lines of every two adjacent resonators are alternately arranged up and down, and strong coupling is generated between resonant elements, so that a broadband bandpass filter is favorably formed, and the size is greatly reduced in the condition that broadband bandpass characteristics are realized.

A microwave frequency tunable filtering balun is provided. The microwave frequency tunable filtering balun comprises a first microwave split ring transmission line resonator and a second microwave split ring transmission line resonator arranged in a bilaterally symmetrical manner, a fourth variable capacitor and a fifth variable capacitor of same parameters. It combines two functions of balun and tunable bandpass filter (BPF) into one circuit, resulting in a compact design. The balun characteristic and frequency-tuning mechanism are investigated, and the design equations are derived.

A second-order band-pass filter for generating at least two transmission zeros includes a first signal terminal, a second signal terminal, a first transmission line resonator, a second transmission line resonator and an impedance inverter. The first transmission line resonator and the second transmission line resonator are symmetric to each other and coupled to the first signal terminal and the second signal terminal, which are formed by bending two quarter-wavelength open stubs and have an open circuit gap between the two terminals. The impedance inverter includes an inductor, a first micro strip line and a second micro strip line. The first micro strip line and the second micro strip line are symmetric to each other, and are coupled to the first signal terminal and the second signal terminal and coupled to a ground through the inductor, respectively.

A harmonic oscillator comprises a transmission line resonator in which an oscillation frequency depends on an electrical length of a transmission line and both ends of the transmission line are electrical open ends; an active element for oscillation as a negative resistance connecting to the transmission line resonator; an output line connected to a midpoint portion of the transmission line resonator; and electrical and / or physical suppressing means for suppressing a voltage displacement distribution of second harmonic among the even-order harmonics. The suppressing means is provided at a position which is at least a minimum voltage displacement portion for the second harmonic between the midpoint portion and either ends of the transmission line resonator.

System includes first and second amplifying circuits that are configured to receive input signals having a fundamental frequency. The system also includes first and second transmission lines that are configured to receive voltage and current waveforms from the first and second amplifying circuits, respectively. The system also includes a capacitively-compensated transmission line resonator (CC-TLR) that is configured to be electrically connected to a load having a load impedance. The CC-TLR is configured to receive and combine RF power from the first and second transmission lines. The CC-TLR has a compensation capacitance that causes the CC-TLR to present an open circuit at the fundamental frequency and present a short circuit at harmonic frequencies. Optionally, a characteristic impedance (Z0) of the first and second transmission lines and a load impedance (ZL) are unequal, and the first and second transmission lines cause a load impedance transformation.

The invention discloses a four-order Ka waveband band-pass filter based on a printed ridge gap waveguide. The filter comprises a microstrip filter structure arranged on the upper surface of a dielectric substrate, a top metal cover plate and a feed dielectric layer located in the middle layer and used for stabilizing an air gap. The microstrip filter structure comprises an input port, an output port, two half-wavelength coupling transmission line resonators and two T-shaped resonators. Two transmission zeros outside a passband can be obtained and adjusted by adjusting the longitudinal lengthsof the two T-shaped resonators, so that better frequency selection is realized, and the performances such as in-band insertion loss, relative bandwidth, in-band flatness and out-band rejection of thefilter are superior to those of a traditional Ka waveband band-pass filter. The invention also provides a processing and manufacturing scheme, and a test result is basically consistent with a simulation result. The antenna is simple in structure, small in size, easy to process, stable in performance, high in integrity and easy to systematically integrate with other circuits, and has wide application in future millimeter wave communication transmission application.

A planar filter has first and second U-shaped open transmission line resonators (103, 105) and a crank-shaped open transmission line resonator (104), so that it is possible to decrease an area to be virtually occupied by the filter on a dielectric substrate (110) and enhance the attenuation characteristic.

Condenser microphone devices used in radio devices to reduce noise generated by high frequency signal radiation from transmission units. A series resistor is provided between the bypass capacitor provided between the drain and the source of the field effect transistor and the microphone signal transmission line to prevent high-frequency voltage rise due to resonance between the bypass capacitor and the microphone signal output transmission line. Therefore, noise generated by high-frequency signal radiation can be reduced.

A transmission line resonator includes distributed coupled lines including first distributed constant line which one ends are connected to a short-circuit grounding portion and second distributed constant line which is disposed in parallel to the first distributed constant line while being separated therefrom by a predetermined distance and which one ends opposing the short-circuit grounded one ends of the first distributed constant line are connected to the short-circuit grounding portion, and a single transmission line which both ends are connected to the respective other ends of the distributed coupled lines.

System includes first and second amplifying circuits that are configured to receive input signals having a fundamental frequency. The system also includes first and second transmission lines that are configured to receive voltage and current waveforms from the first and second amplifying circuits, respectively. The system also includes a capacitively-compensated transmission line resonator (CC-TLR) that is configured to be electrically connected to a load having a load impedance. The CC-TLR is configured to receive and combine RF power from the first and second transmission lines. The CC-TLR has a compensation capacitance that causes the CC-TLR to present an open circuit at the fundamental frequency and present a short circuit at harmonic frequencies. Optionally, a characteristic impedance (Z0) of the first and second transmission lines and a load impedance (ZL) are unequal, and the first and second transmission lines cause a load impedance transformation.

The invention discloses a fourth-order Ka-band bandpass filter based on a printed ridge gap waveguide. The filter includes a microstrip filter structure arranged on the upper surface of a dielectric substrate, a top metal cover plate and a middle layer for stabilizing The feed dielectric layer for the air gap. The microstrip filter structure includes input and output ports, two half-wavelength coupled transmission line resonators and two T-shaped resonators. By adjusting the longitudinal length of the two T-shaped resonators, two transmission zeros outside the passband can be obtained and adjusted to achieve better frequency selection, and its in-band insertion loss, relative bandwidth, in-band flatness and out-of-band rejection And other performance are better than the traditional Ka-band bandpass filter. The invention also provides a processing and manufacturing scheme, and the test results are basically consistent with the simulation results. The invention has the advantages of simple structure, small size, easy processing, stable performance, strong integrity, easy system integration with other circuits, and wide application in future millimeter wave communication transmission applications.

Power combiner / divider includes a transmission line (TL) resonator having an inner conductor, an outer conductor that surrounds the inner conductor, and a cavity between the inner conductor and the outer conductor. The inner conductor and the outer conductor are electrically connected at a proximal end of the TL resonator. The power combiner / divider also includes coupling elements extending through respective openings of the outer conductor and into the cavity. The power combiner / divider also includes a capacitive element connected to at least one of the inner conductor or the outer conductor. The capacitive element capacitively couples the inner conductor and the outer conductor at a distal end of the TL resonator.

Power combiner / divider includes a transmission line (TL) resonator having an inner conductor, an outer conductor that surrounds the inner conductor, and a cavity between the inner conductor and the outer conductor. The inner conductor and the outer conductor are electrically connected at a proximal end of the TL resonator. The power combiner / divider also includes coupling elements extending through respective openings of the outer conductor and into the cavity. The power combiner / divider also includes a capacitive element connected to at least one of the inner conductor or the outer conductor. The capacitive element capacitively couples the inner conductor and the outer conductor at a distal end of the TL resonator.

A self-calibrating transmission line resonator oscillating driver apparatus, including: a first output driver module configured to transmit a first forward signal along a transmission line; a second output driver module configured to transmit a second forward signal along the transmission line; a first reflection detection module configured to detect a first return signal of the first forward signal reflected along the transmission line; and a second reflection detection module configured to detect a second return signal of the second forward signal reflected along the transmission line; wherein, when the first reflection detection module detects the first return signal of the first forward signal reflected along the second direction of the transmission line, providing a signal to i) change a power state of the first output driver module to an off-power state and to ii) change a power state of the second output driver module to an on-power state.

A dual nuclear MR transmission line resonator is capable of operating on 1X pairs, with X being 31P, 23Na, 3He, or 129Xe. The resonator avoids many of the problems inherent in conventional dual nuclear designs. No LC trap is used, and the coil has substantially the same spatial profile on both nuclei. In the resonator, an augmented MR tune / match circuit, includes a conventional capacitive L circuit, with the L circuit shunted at a match point by a notch filter tuned to a frequency of a companion nucleus. Also disclosed is a method for simultaneously resonating conductive loops of surface coils or conductive elements of volume coils simultaneously on both 1H and X with hybrid transmission line termination elements bonded to the resonator loop or conductive elements in shunt with respect to one another.

A resonant power converter (220) for ultra-efficient radio frequency transmission and associated methods is disclosed. In one exemplary embodiment, the invention is digitally actuated and uses a combination of a noise-shaped encoder (222), a charging switch (224), and a high-Q resonator (204) coupled to an output load (206), typically an antenna or transmission line. Energy is built up in the electric and magnetic fields of the resonator, which, in turn, delivers power to the load (206) with very little wasted energy in the process. No active power amplifier is required. The apparatus (220) can be used in literally any RF signal application (wireless or otherwise), including for example cellular handsets, local- or wide-area network transmitters, or even radio base-stations.

The power line band-stop microwave interference suppression filter is a power line interference suppression filter with good insertion loss performance in the 8GHz-40GHz frequency band. It is suitable for electromagnetic compatibility and power line filtering in the microwave field. The filter is composed of conductors and Composed of transmission line oscillators, the filter takes the inner conductor as the axis, and the outer circumference of the middle part of the inner conductor is multi-level stepped, and the outer diameter increases sequentially. On each step, there are correspondingly set the first transmission line oscillator, the second transmission line oscillator, The third transmission line vibrator, the fourth transmission line vibrator, and the fifth transmission line vibrator are provided with insulating positioning sleeves on the outer circumferences of the first transmission line vibrator and the second transmission line vibrator, and the third transmission line vibrator, the fourth transmission line vibrator, and the fifth transmission line vibrator are provided with insulating positioning sleeves. An insulating sleeve is arranged on the outer circumference of the vibrator, an outer conductor is arranged on the outer circumference of the insulating positioning sleeve and the insulating sleeve, and a left potting cover and a right potting cover are arranged between two ends of the outer conductor and the inner conductor.

A dual nuclear MR transmission line resonator is capable of operating on 1X pairs, with X being 31P, 23Na, 3He, or 129Xe. The resonator avoids many of the problems inherent in conventional dual nuclear designs. No LC trap is used, and the coil has substantially the same spatial profile on both nuclei. In the resonator, an augmented MR tune / match circuit, includes a conventional capacitive L circuit, with the L circuit shunted at a match point by a notch filter tuned to a frequency of a companion nucleus. Also disclosed is a method for simultaneously resonating conductive loops of surface coils or conductive elements of volume coils simultaneously on both 1H and X with hybrid transmission line termination elements bonded to the resonator loop or conductive elements in shunt with respect to one another.