533 results about "Microstrip transmission line" patented technology

An efficient, low-loss, low sidelobe, high dynamic range phased-array radar antenna system is disclosed that uses metamaterials, which are manmade composite materials having a negative index of refraction, to create a biconcave lens architecture (instead of the aforementioned biconvex lens) for focusing the microwaves transmitted by the antenna. Accordingly, the sidelobes of the antenna are reduced. Attenuation across microstrip transmission lines may be reduced by using low loss transmission lines that are suspended above a ground plane a predetermined distance in a way such they are not in contact with a solid substrate. By suspending the microstrip transmission lines in this manner, dielectric signal loss is reduced significantly, thus resulting in a less-attenuated signal at its destination.

A wireless IC interconnect system and method facilitates interconnections between first and second IC locations via a wireless transmission medium; the IC locations may be on the same chip or on separate chips. A signal to be conveyed is modulated, and the modulated signal is capacitively coupled to the wireless transmission medium—preferably a properly terminated microstrip transmission line (MTL) or a coplanar waveguide (CPW). The modulated signal is capacitively coupled from the wireless medium to a receiver which demodulates the modulated signal and provides the demodulated signal to the second IC location. In a preferred embodiment, the wireless transmission system conveys numerous signals simultaneously, with the signals modulated and demodulated with multiple access algorithms such as code-division (CDMA) and/or frequency-division (FDMA) multiple access algorithms. The interconnection system can be made reconfigurable, with the destinations of the modulated signals changed by reprogramming associated address codes.

A power amplifier includes larger size transistors to provide higher power gain at lower frequencies. Transistors of transistor unit cells include a horseshoe-shaped emitter and a strip-shaped base to increase gain. Transistors are combined at a first level to form transistor arrays, which are combined with bonding wires at a second level to an output micro strip transmission line. A Vbe referenced bias circuit may include a smart function to lower quiescent current.

An electronic device includes a printed circuit board (PCB) including a planar surface conductor, e.g. such as a microstrip transmission line or coplanar transmission waveguide. A surface mount connector portion is mounted to the PCB and includes an electrically conductive header having a cylindrical bore extending therethrough and aligned normal to the PCB, the electrically conductive header also having a radially extending main recess in a bottom end thereof in communication with the cylindrical bore. An electrically conductive pin extends through the main recess and has a first end coupled to the planar surface conductor, a second end within the cylindrical bore and a bend therebetween. A dielectric is in the main recess between the pin and adjacent portions of the electrically conductive header, and an interconnect is within the cylindrical bore and includes a center conductive channel to receive the second end of the pin.

A microstrip-to-waveguide power combiner includes a dielectric substrate and at least two microstrip transmission lines formed thereon in which radio frequency signals are transmitted. The microstrip transmission lines terminate in microstrip launchers or probes at a microstrip-to-waveguide transition. A waveguide opening is positioned at the transition. A waveguide back-short is positioned opposite the waveguide opening at the transition. Isolation vias are formed within the dielectric substrate and around the transition and isolate the transition. A coaxial-to-waveguide power combiner is also disclosed.

The invention discloses a multi-path asymmetrical Doherty power amplifier, which comprises a first coupler, a second coupler, a carrier amplifier, a first 1/4 wavelength impedance conversion microstrip transmission line, a second 1/4 wavelength impedance conversion microstrip transmission line, a first peak amplifier and a second peak amplifier, wherein the first output end of the first coupler is connected with the first 1/4 wavelength impedance conversion microstrip transmission line sequentially by the second peak amplifier and the second 1/4 wavelength impedance conversion microstrip transmission line; the second output end of the first coupler is connected with a carrier amplifier and the input end of the first peak amplifier by the second coupler respectively; the output end of the carrier amplifier is connected with the first 1/4 wavelength impedance conversion microstrip transmission line; and the output end of the first peak amplifier is connected with the first 1/4 wavelength impedance conversion microstrip transmission line by the second 1/4 wavelength impedance conversion microstrip transmission line. The multi-path asymmetrical Doherty power amplifier has the advantages of high integration level, low cost, high efficiency, circuit stability and the like.

An integrated N-way Wilkinson power divider is described. In one embodiment, the N-way Wilkinson power divider uses a conductor layer with a cross-over (or cross-under) resistor insulated from the conducting layer by an insulating bridge. In one embodiment, the width of the transmission line underneath a cross-over resistor is adjusted to improve performance In one embodiment, a three-way Wilkinson power divider is formed using microstrip transmission lines on a single-layer substrate that supports the microstrip transmission lines, dielectric insulators, and resistors.

A millimeter wave 3dB power distributing/synthesizing network comprises a millimeter wave rectangular waveguide, two probes with same shape and structure and two microstrip transmission lines; two probes extend along the rectangular waveguide E-surface face to face and are vertically inserted into the rectangular waveguide from a same opening at the surface of the wide edge of the rectangular waveguide, the plug-in position is symmetrical to the central plane of the wide edge of the rectangular waveguide, and the theoretical space between the center line of the two probes and the waveguide short circuit surface in the conveying direction of the rectangular waveguide is a quarter of the waveguide wavelength. The millimeter wave 3dB power distributing/synthesizing network can realize the conversion of millimeter wave full waveguide band width waveguide to microstrip and power distributing/synthesizing, and has the characters of wide frequency band, low wastage, easy manufacturing, facilitating the installation of the solid device, compact conformation, and conveniently realizing the multiplex distributing/synthesizing.

A microstrip transmission line structure is disclosed wherein a transmission element is attached to a substrate in a way such that the element is suspended above the substrate separated by a predetermined distance from a ground plane. In one embodiment, the transmission element is supported by a plurality of support legs that are disposed in a way such that the transmission element is suspended above the substrate. In another embodiment, a portion of the substrate is removed in a way such that, when the transmission element is disposed on the substrate, the line is separated from the ground plane by a predetermined distance.

The invention discloses a dual-polarization tight coupling dipole array antenna. An antenna unit is formed by orthogonally combining two single-polarization dipole units of a same type. Each single-polarization dipole unit is formed by an interdigital dipole, feed line Balun, metal floor and a wide angle matching layer. The feed line Balun is formed by three portions: a coplanar strip line portion connected to the dipole, a gradual change triangle microstrip transmission line whose feed end is connected to a coaxial line and an intermediate transition portion. In the invention, based on the dipole array antenna, a mutual-coupling effect among array elements is used to expand a frequency bandwidth, and the wide angle matching layer is introduced to improve a wide angle scanning characteristic of an antenna array. A common mode resonance caused by a common mode current existing at a specific frequency point under coplanar strip line feed is processed. Through arranging a 50ohm resistor between the metal floor and gradual change ground, the common mode current is shunted so that the common mode resonance disappears, simultaneously a work bandwidth of an antenna is expanded and performance in a whole work bandwidth can be well increased.

A surface mount technology (“SMT”) apparatus for use in routing radio frequencies (“RF”) between cavities that require a high level of isolation on a single printed circuit board (“PCB”). The SMT part is attached to the PCB over a stripline-ready trace which transitions to microstrip before and after the SMT stripline part to maintain consistent characteristic impedance. When presented with a high isolation need between two cavities using microstrip transmission lines, the proposed stripline SMT apparatus under the isolation wall will tend to provide the necessary isolation. The present invention provides a repeatable and reliable interconnect while improving the electrical match between the two cavities. Furthermore, the invention removes the costs associated with manually forming and soldering cables between PCBs.

A serpentine guard trace for reducing far-end crosstalk of a micro strip transmission line is provided. The serpentine guard trace reduces receiving-end crosstalk caused by an electromagnetic interference of a signal of a nearby transmission line when transmitting a high speed signal through a micro strip transmission line on a printed circuit board. The serpentine guard trace is located between two nearby transmission lines and has a line width narrower than that of transmission lines for an effective serpentine structure. A characteristic impedance of the serpentine guard trace increases due to the narrow line width. Termination resistors having impedance which is the same as the characteristic impedance of the serpentine guard trace are located on both ends of the guard trace to minimize a reflection wave generated in the serpentine guard trace. The receiving-end crosstalk can be effectively reduced by using the serpentine guard trace instead of a linear guard trace. Accordingly, the serpentine guard trace can be effectively used when a high speed signal is transmitted on a printed circuit board.

The invention relates to a balun-free low-section plane two-arm groove helical array antenna, composed of an annular microstrip transmission line, a ceramic medium plate, a plane two-arm groove helical array, an absorption resistance, metalized via hole, a coaxial joint, a metal carinal cavity and a metal ground plate. The annular microstrip transmission line connecting the coaxial joint and the absorption resistance is on the front face of the ceramic medium plate; the plane two-arm groove helical array is etched on the metal ground plate of the ceramic medium plate; and the annular plane metal carinal cavity is on the back of the ceramic medium plate. Echo loss within 1.52 to 1.62 GHz is less than -10dB. The antenna has good gain and axial specific characteristic. The antenna needs no balun, has features of low section, miniaturization, simple structure and easy implement, and can be used as a terminal receiving antenna of a plurality of satellite navigation and positioning systems.

Disclosed are a microstrip transmission line having a common defected ground structure (DGS) and a wireless circuit apparatus having the same. The microstrip transmission line realizes a common defected ground structure (DGS) and a double microstrip structure, and includes: a first dielectric layer; a first signal line pattern formed on a first surface of the first dielectric layer; a common ground conductive layer formed on a second surface of the first dielectric layer and having a defected ground structure, the first surface facing the second surface; a second dielectric layer having a first surface brought into contact with the common ground conductive layer, and facing the first dielectric layer while interposing the common ground conductive layer between the first dielectric layer and the second dielectric layer; and a second signal line pattern formed on a second surface of the second dielectric layer, the first surface facing the second surface.

Provided are a phase shifter with a photonic band gap (PBG) structure using a ferroelectric thin film. The phase shifter includes a microstrip transmission line acting as a microwave input/output line and a plurality of tunable capacitors arranged in the microstrip transmission line at regular intervals. Electrodes disposed on a substrate apply DC voltages to the plurality of tunable capacitors. Radio frequency (RF) chokes and quarter wavelength radial-stubs are connected between the electrodes and the microstrip transmission line in order to prevent high frequency signals from flowing into a DC bias terminal. A plurality of PBGS are periodically arrayed on a ground plane of the substrate.

The invention discloses a high-isolation four-port diversity antenna for mobile communication, which comprises a dielectric substrate, a grounding plane, a feed network, four electromagnetic dipoles, four L-shaped ribbons, four aerial microstrip transmission lines and a vertical copper line, wherein the four electromagnetic dipoles are annularly and evenly arranged on the square grounding place at intervals; one L-shaped ribbon and one aerial microstrip transmission line are arranged in each electromagnetic dipole, and the L-shaped ribbons are connected with the feed network through the aerial microstrip transmission lines; and one end of the vertical copper line is vertical to the center of the grounding plane. According to the invention, in the working bandwidth, the radiation efficiency of four modules all exceed 80 percent; and compared with the major traditional diversity antennas with a boardband mode, the high-isolation four-port diversity antenna can provide a wider radiation range in different polarization modes, thereby greatly improving the system property. In addition, when the high-isolation four-port diversity antenna is used for an array structure, additional angle flexibility can be formed in aspects of wave beam control and wave beam forming.

A process control instrument includes a circuit board having a control circuit for generating or receiving a high frequency signal. An antenna includes an electrical conductor. An intrinsic safety circuit couples the control circuit to the antenna and comprises a microstrip transmission line on the circuit board electrically connecting the control circuit to the electrical conductor. A safety stub has a first end electrically connected to the transmission line proximate the electrical conductor and a second end connected to a ground of the control circuit.

The invention relates to a waveguide-micro-strip integrated power distributor-synthesizer. The waveguide-micro-strip integrated power distributor-synthesizer comprises a rectangular waveguide, a medium substrate, a common land being inserted into the medium substrate and two micro-strip probes, wherein the two micro-strip probes are symmetric to each other about the common land and are respectively attached on the upper surface and the lower surface of the medium substrate, the two micro-strip probes are respectively and sequentially connected with two groups of micro-strip line impedance variable sections and two micro-strip transmission lines to form two parallel groups of micro-strip lines which are symmetric to each other about the common land and are respectively located on the upper surface and the lower surface of the medium substrate, the two micro-strip probes are vertically plugged into the rectangular waveguide from an opening on the side wall of a wide edge of the rectangular waveguide along a surface E of the rectangular waveguide, the plugging positions of the two micro-strip probes are symmetric to each other about a central surface of the wide edge of the rectangular waveguide; and a theoretical distance from the central line of each micro-strip probe to a waveguide short-circuited surface in the transmission direction of the rectangular waveguide is a quarter of one waveguide wavelength. The waveguide-micro-strip integrated power distributor-synthesizer has beneficial effects of low loss, wide band, good consistence of amplitudes and phases among different branches, compact structure and easiness in realization.

The present invention provides an optical device. In one embodiment, the optical device includes an optical waveguide formed in or over a ridge located on a substrate. The optical device also includes a microstrip transmission line comprising a signal electrode and a ground electrode adjacent the ridge and a low-k dielectric material separating the signal and ground electrodes. The present invention also provides a method for making the optical device.

A radio frequency (RF) transition for a three dimensional molded RF structure is provided. In one embodiment, the invention relates to a radio frequency (RF) transition for an RF structure, the RF transition includes an assembly having a first flexible layer, a second flexible layer, and a third flexible layer, wherein a first section of the assembly includes a microstrip transmission line, wherein a second section of the assembly includes a dielectric stripline transmission line, and wherein a third section of the assembly includes a suspended substrate stripline transmission line.

The present invention relates to the construction of output stage of the Doherty amplifier and comprises a main amplifying unit, an auxiliary amplifying unit and a compact λ/4 line connecting two amplifying units. The compact λ/4 line connecting two amplifying units includes a first parallel capacitor grounded by being connected to the main amplifying unit in parallel; a second parallel capacitor grounded by being connected to the auxiliary amplifying unit in parallel; and an inductor or a microstrip transmission line connecting the main amplifying unit and the auxiliary amplifying unit. The Doherty amplifier in accordance with the present invention further comprises a matching network unit connecting to a final output by connecting the main amplifying unit and the auxiliary amplifying unit and; and a λ/4 line used as the voltage inputs of the main amplifying unit and the auxiliary amplifying unit.