Abstract: The present invention relates to a common mode filter and a method of manufacturing the same. In order to implement a common mode filter with low shrinkage, high substrate sintered density, and high strength, the present invention provides a common mode filter including: a lower substrate; an insulating layer having a conductor pattern inside and provided on the lower substrate; an upper substrate provided on the insulating layer; and a ferrite core made of ferrite and provided in the center of the insulating layer, the lower substrate, and the upper substrate by penetrating the insulating layer, the lower substrate, and the upper substrate, and a method of manufacturing the same.

Abstract: Ultra-wideband 180° hybrids for feeding a radiator of one band of a dual-band dual-polarization cellular basestation antenna are disclosed. The hybrid comprises: metal plates configured in parallel as groundplanes, and a dielectric substrate disposed between plates. First and second metallizations are implemented on opposite exterior surfaces of substrate and are shorted together to keep metal tracks at same potential to form conductor. Plates and first and second metallizations form first stripline circuit implementing matched splitter with short-circuit shunt stub Sum input port is provided at one end and two output ports are provided at opposite ends. Branches of matched splitter narrow to provide gap between output tracks. Third metallization is disposed within substrate. First, second and third metallizations form second stripline circuit. Tracks of third metallization comprise quarter-length transformers of different widths.

Abstract: A nanoparticle-enhanced liquid crystal phase shifter is provided including a first substrate layer, a plurality of electrodes attached to the substrate layer, a ground plane layer attached to a second substrate layer, and a liquid crystal layer between the ground plane layer and the first substrate layer, including a suspension of a liquid crystal material and highly polarizable nanoparticles having specific shape and size characteristics.

Abstract: A stripline includes a first ground plane; a second ground plane; a first signal trace located between the first ground plane and the second ground plane; and a center via that extends through the stripline and is in electrical contact with the first ground plane and the first signal trace.

Abstract: A method of and circuit for improving stabilization of a non-Foster circuit. The method comprises steps of and the circuit includes means for measuring a noise hump power at an antenna port or an output port of the non-Foster circuit, comparing the measured noise hump power with a desired level of noise power that corresponds to a desired operating state of the non-Foster circuit, and tuning the non-Foster circuit to generate the desired level of noise power to achieve the desired operating state of the non-Foster circuit.

Abstract: Disclosed is a waveguide for even dispersion of microwaves into a microwave chamber. The microwaves are dispersed in a manner that the target in the microwave chamber does not need to be turned in order to accomplish even and uniform heating of the target. The waveguide includes a first rectangular section adjacent to the source, and a second rectangular section which is sized to separate, disperse and randomized microwaves received from the first waveguide.

Abstract: In an embodiment, a circuit may include an input node, an output node, an internal node, a compensation circuit, and an adjustable capacitance circuit. The compensation circuit may be configured to modify a return loss of a signal received at the input node. The compensation circuit may include a first inductive element, a second inductive element, and a capacitive element. The first inductive element may couple the input node and the output node. The second inductive element may couple the output node and the internal node. The capacitive element may couple the input node and the internal node. The adjustable capacitance circuit may be configured to adjustably modify the return loss of the signal received at the input node. The capacitance circuit may be coupled to the compensation circuit.

Abstract: A radio frequency (RF) generation system includes an impedance determination module that receives an RF voltage and an RF current. The impedance determination module further determines an RF generator impedance based on the RF voltage and the RF current. The RF generation system also includes a control module that determines a plurality of electrical values based on the RF generator impedance. The matching module further matches an impedance of a load based on the RF generator impedance and the plurality of electrical components. The matching module also determines a 2 port transfer function based on the plurality of electrical values. The RF generation system also includes a virtual sensor module that estimates a load voltage, a load current, and a load impedance based on the RF voltage, the RF generator, the RF generator impedance, and the 2 port transfer function.

Abstract: A coupling structure for a multi-layered chip filter includes a resonator layer including a resonator pattern with spaced areas and a coupling layer including at least two separated overlap portion patterns overlapped with the spaced areas of the resonator pattern respectively and a connecting portion pattern having multiple linear portions connecting the separated overlap portion patterns in an area not-overlapped with the resonator pattern.

Abstract: A SAW filter circuit having improved ESD resistance is specified, in which a series interconnection composed of SAW resonators is interconnected between a first signal port and a dual-mode SAW filter port. The static capacitance of the series interconnection is at most four times the static capacitance of the dual-mode SAW filter transducers interconnected therewith.

Abstract: A transmission line is provided in which a first portion of the transmission line is configured to be connected to a source, and a second portion of the transmission line is configured to be connected to a load. A capacitive element is coupled to the transmission line and is configured to compensate for an impedance difference between the load and at least one of the source or the transmission line, at a frequency within a frequency bandwidth of the load. A difference between an internal capacitance of the first portion of the transmission line and the second portion of the transmission line substantially matches the capacitance of the capacitive element.

Abstract: An active inductor circuit includes a field-effect transistor having a first source/drain adapted for connection with a first voltage source, a capacitor coupled between the first voltage source and a gate of the field-effect transistor, a resistor coupled between a second source/drain of the field-effect transistor and the gate of the field-effect transistor, and a current source coupled with the gate of the field-effect transistor. A voltage headroom of the active inductor circuit is controlled as a function of at least one of a magnitude of current generated by the current source and a resistance of the resistor.

Abstract: In one embodiment, an apparatus includes a line side of a network device. The line side is configured to connect to a device external to the network device. The apparatus also includes a physical side of the network device. The physical side is configured to communicate with an external entity. An isolation device is configured to isolate the physical side from the line side. An inductor is coupled between the line side and the physical side. The inductor has a value configured to control a matching of an impedance of the line side with an impedance of the physical side as seen through the isolation device.

Abstract: An acoustic wave device has a substrate and adjacent IDT electrodes. One IDT electrode has a signal connecting bus bar at one side in a direction orthogonal to a propagation direction and is connected to a signal line. A ground bus bar is grounded and located at the other side in the orthogonal direction. The other IDT electrode has a signal connecting bus bar which is located at the other side in the orthogonal direction and is connected to a signal line. A ground bus bar is grounded and located at the one side in the orthogonal direction. The acoustic wave device further has a floating member on the substrate, which is located at a space between the ground bus bar of the IDT electrode and the signal connecting bus bar of the IDT electrode and is not connected to the ground bus bar nor the signal connecting bus bar.

Abstract: A high-frequency module enabling sufficient attenuation over a wide frequency range outside of a passband includes a triplexer including a combination of an LPF, a BPF, and HPFs arranged to demultiplex a signal input from a common terminal into a first communication signal, a second communication signal, and a third communication signal in different frequency bands, and to output the first, second, and third communication signals from individual terminals. The individual terminals of the triplexer are connected to respective baluns. The baluns are configured such that the respective passbands of the baluns overlap the respective frequency bands of the communication signals and the respective passbands of the triplexer, and the attenuation of the baluns at the attenuation poles of the triplexer is ?3 dB or greater. This configuration provides high attenuation in the rebound bands of the attenuation poles.

Abstract: An ortho-mode transducer may include a cylindrical common waveguide terminating in a common port, a rectangular vertical branch waveguide in-line with the cylindrical common waveguide and terminating in a vertical port, and a rectangular horizontal branch waveguide normal to the common waveguide and terminating in a horizontal port. The vertical branch waveguide may be configured to couple a first linearly polarized mode from the vertical port to the common waveguide. The horizontal branch waveguide may be configured to couple a second linearly polarized mode, orthogonal to the first linearly polarized mode, from the horizontal port to the common waveguide. A portion of the vertical branch waveguide may overlap a portion of the cylindrical common waveguide. A septum may span the vertical branch waveguide proximate to the overlapping portions of the vertical branch waveguide and the common waveguide. A rectangular symmetry cavity may be opposed to the horizontal branch waveguide.

Abstract: A data transmission system is provided in which it is possible to perform both of suppressing the degrading of the slew rate and suppressing the ringing even if load capacitance of an input buffer is changed. The data transmission system transmitting data from an output buffer to the input buffer through a trace is provided with first RC parallel circuits connected in series to the trace on a first Printed Circuit Board (PCB) on which the output buffer is mounted, and second RC parallel circuits connected in series to the trace on a second Printed Circuit Board (PCB) on which the input buffer is mounted, and which can be connected and separated to and from the first Printed Circuit Board (PCB).

Abstract: A differential circuit topology that produces a tunable floating negative inductance, negative capacitance, negative resistance/conductance, or a combination of the three. These circuits are commonly referred to as “non-Foster circuits.” The disclosed embodiments of the circuits comprises two differential pairs of transistors that are cross-coupled, a load immittance, multiple current sources, two Common-Mode FeedBack (CMFB) networks, at least one tunable (variable) resistance, and two terminals across which the desired immittance is present. The disclosed embodiments of the circuits may be configured as either a Negative Impedance Inverter (NII) or a Negative Impedance Converter (NIC) and as either Open-Circuit-Stable (OCS) and Short-Circuit-Stable (SCS).

Abstract: A bandpass filter of the present invention includes: rectangular waveguides which are divided into two in a center of a broad plane; and a metal plate which has a substantially ladder shape, is disposed between the rectangular waveguides in parallel with a narrow plane of the rectangular waveguides, and has a pair of beams and plurality of fins that connect the pair of beams. At least one other waveguide is formed by dividing a waveguide path within the rectangular waveguides vertically with respect to a direction which is parallel with the broad plane. At least three resonators are formed within the rectangular waveguides by the metal plate, and each of the other waveguides couples resonators together which crosses at least one of the plurality of resonators so as to form a pole outside a pass band.

Abstract: A resonator device (200) comprises a base (206) comprising an anchor (204) and a vibration unit (212) connected to the anchor (204). The vibration unit (212) is configured to have a first vibration mode (218) and a second vibration mode (216) different from the first vibration mode (218). According to an embodiment, the vibration unit (212) is configured such that the first vibration mode (218) and the second vibration mode (216) destructively interfere at the anchor (204).