30 results about "Transmission line resonator" patented technology

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 high frequency oscillator comprises a transmission line resonator having a midpoint which serves as a null potential point, a pair of active devices for oscillation respectively connected to a pair of mutually opposite-phase resonance wave points for the transmission line resonator, and a plurality of output lines each having one end connected to the transmission line resonator at a point symmetric to the midpoint, and the other end commonly connected to a connection. The pair of active devices share the resonator and oscillate in opposite phases to each other. The plurality of output lines are coupled to the transmission line resonator respectively at maximum displacement distribution points for a standing wave of an 2n-th harmonic in the transmission line resonator, where n is an integer equal to or larger than two. Even-order harmonic components of 2(n−1)-th or lower are suppressed at the connection.

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 transmission line type resonator has a low-loss characteristic and, in order to realize the low-loss characteristic, the transmission line type resonator 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 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 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 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.

The invention discloses a microwave terminal short circuit half-wavelength tunable resonator and microwave tunable filter manufactured by the microwave terminal short circuit half-wavelength tunable resonator. The microwave terminal short circuit half-wavelength tunable resonator comprises a terminal short circuit half-wavelength transmission line resonator, two ends of the half-wavelength transmission line resonator are grounded, a variable capacitance diode is connected at the middle part of the half-wavelength transmission line resonator, and the other end of the variable capacitance diodeconnected at the middle part of the half-wavelength transmission line resonator is grounded. The microwave tunable filter is formed by coupling two identical microwave terminal short circuit half-wavelength trough-line resonators arranged in opposition. The invention has the advantages of compact structure, small size, light weight, easy integration and the like; the microwave terminal short circuit half-wavelength tunable resonator designed in the invention can tune fundamental resonant frequency on the basis of not changing secondary resonant frequency, thus being favorable for inhibiting secondary harmonic and improving system performance.

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.

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.

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.