36 results about "Open stub" patented technology

The present invention discloses a microstrip line tuning circuit. The tuning circuit is composed of a single-layer PCB circuit board, and the single-layer PCB circuit board consists of three parts: a front copper-clad microstrip line, a dielectric board, and a back copper-clad ground plane. The front copper-clad microstrip line includes: an input pad, an output pad, an input impedance transformation section, an output impedance transformation section, and a resonator composed of a plurality of parallel open stubs. The above resonator eliminates the impedance discontinuity phenomenon caused by electromagnetic mode conversion near the corresponding frequency point of the ultra-wideband radiation unit through "anti-resonance", so as to achieve the purpose of expanding the impedance bandwidth. Considering that the most widely used base station antenna radiation units currently basically operate below the third-order mode, the above microstrip line tuning circuit is optimized to a suitable resonance frequency, and theoretically adapts to almost all radiation units, significantly improving the impedance bandwidth. The present invention also provides a base station antenna.

The embodiment of the utility model relates to the technical field of antennas, in particular to an antenna and communication equipment, which comprises a radiation layer provided with a radiation body, a microstrip feeder line and an open-circuit branch knot, the microstrip feeder line is connected with the radiation body, and the open-circuit branch knot is connected with the microstrip feeder line; the microstrip feeder line is provided with a first gap; the radiator is provided with two second gaps, and the two second gaps are symmetrical about the center line of the microstrip feeder line in the length direction; a radio frequency formation; the dielectric layer comprises a first surface and a second surface which are oppositely arranged, the radiation layer is arranged on the first surface, and the radio frequency ground layer is arranged on the second surface. Through the above mode, the antenna provided by the embodiment of the utility model can have in-band double trapped waves, thereby forming effective suppression on in-band interference.

A balanced line-unbalanced line converter is provided with: a balanced-side line having a first transmission line (2), one end (21) of which is a first signal end and the other end (22) of which is short-circuited, and a second transmission line (3), one end (31) of which is a second signal end and the other end (32) of which is short-circuited; an unbalanced-side line (4), one end (41) of which is a third signal end and the other end (42) of which is an open end, the unbalanced-side line (4) having a first transmission line section (43) that constitutes a first coupling line (C1) with the first transmission line (2) and a second transmission line section (44) that constitutes a second coupling line (C2) with the second transmission line (3); a first open stub (5) connected to one end (31) of the second transmission line (3); and a second open stub (6) connected to the unbalanced side line (4) and constituting a third coupling line (C3) with the first open stub (5).

A termination circuit includes a first open stub that includes multiple first straight portions and multiple first connection portions with which the adjacent first straight portions are connected and that is formed in a meander pattern, and a second open stub that includes multiple second straight portions and multiple second connection portions with which the adjacent second straight portions are connected and that is formed in a meander pattern. The first open stub and the second open stub are provided on different layers and are electrically connected to each other. The first open stub is provided so as to be overlapped with at least part of the second open stub in a plan view and an extending direction of the first straight portions is different from an extending direction of the second straight portions.

The invention provides a Doherty amplifier circuit and a semiconductor device. A Doherty amplifier circuit is provided with: a distributor that distributes an input signal that is input into a first signal and a second signal; a circuit board; a first amplifier which is provided on the circuit board, amplifies the first signal, and outputs the amplified signal as a fourth signal; a second amplifier which is provided on the circuit board, amplifies the second signal, and outputs the amplified signal as a fifth signal; a combining node combining the fourth signal and the fifth signal, and outputting the combined signal as an output signal to an output terminal; an open stub, an end of which is electrically connected to a path between the distributor and the first amplifier; the first end of the first impedance transformer is electrically connected to the second amplifier, and the second end of the first impedance transformer is electrically connected to the synthesis node.

The high-performance low-pass filter topological structure comprises a second microstrip line and a seventh microstrip line which are connected in sequence, the second microstrip line is connected with an input end, and the seventh microstrip line is connected with an output end; a first microstrip line and a third microstrip line are symmetrically connected between the second microstrip line and the input end, the first microstrip line is connected with a first open-circuit branch knot, and the third microstrip line is connected with a second open-circuit branch knot; a fourth microstrip line and a fifth microstrip line are symmetrically connected between the second microstrip line and the seventh microstrip line, the fourth microstrip line is symmetrically connected with a third open-circuit branch knot and a fourth open-circuit branch knot, and the fifth microstrip line is symmetrically connected with a fifth open-circuit branch knot and a sixth open-circuit branch knot; a sixth microstrip line and an eighth microstrip line are symmetrically connected between the seventh microstrip line and the output end, the sixth microstrip line is connected with a seventh open-circuit branch knot, and the eighth microstrip line is connected with an eighth open-circuit branch knot; according to the low-pass filter, the defects of poor selectivity, narrow stop band and complex design process of a low-pass filter design scheme are overcome.

The utility model discloses a bandwidth reconfigurable low-pass filter topological structure, which comprises a second microstrip line and a seventh microstrip line which are sequentially connected along a first direction, the second microstrip line is connected with an input end, and the seventh microstrip line is connected with an output end; a first microstrip line is connected between the input end and the second microstrip line, and the first microstrip line is connected with a first open circuit branch; an eighth microstrip line is connected between the seventh microstrip line and the output end, and the eighth microstrip line is connected with a sixth open-circuit branch knot; a third microstrip line and a fifth microstrip line are symmetrically connected between the second microstrip line and the seventh microstrip line; the third microstrip line is sequentially connected with a first variable capacitance diode and a fourth microstrip line, and the fourth microstrip line is symmetrically connected with a second open-circuit branch knot and a third open-circuit branch knot; the fifth microstrip line is sequentially connected with a second variable capacitance diode and a sixth microstrip line, and the sixth microstrip line is symmetrically connected with a fourth open-circuit branch knot and a fifth open-circuit branch knot; according to the utility model, the problem that the filter cannot satisfy high selectivity and wide stop band at the same time is solved.

The present invention discloses a miniaturized multi-transmission zero balanced dual-band bandpass filter based on notch, specifically including: a differential structure parallel two-wire input port A, a differential structure parallel two-wire output port B, a dielectric substrate, two sections of annular double-sided differential signal transmission lines, two sections of straight double-sided differential signal transmission lines, two groups of inverting connection structures, two groups of double-sided hairpin-type coupled lines, two sections of double-sided terminated open stubs, two sections of double-sided high-impedance transmission lines, one section of double-sided low-impedance transmission line, one group of double-sided grounding structures, and one group of double-sided terminated short-circuit parallel coupled lines. The present invention realizes the high-performance dual-band broadband bandpass filtering characteristics of multi-transmission zeros and high out-of-band rejection for differential-mode signals, and introduces notch characteristics into the balanced filter structure, thereby suppressing the interference signals between the high- and low-pass frequency bands. Therefore, it is very suitable for application in various balanced microwave systems to improve the overall performance of the system.

This identification system comprises: a wire harness which includes an electric wire and a reflection part that reflects a signal flowing through the electric wire; and an identification device which is connected to the wire harness and which identifies the wire harness on the basis of a reflection signal from the reflection part. The reflection part is provided with a plurality of open stubs. The reflection signal contains an identification code corresponding to the plurality of open stubs. The identification code is for identifying the wire harness. The identification device comprises a signal generation circuit for sending a signal to the electric wire and a read circuit for reading the identification code from the reflection signal, which is based on a reflected wave from the reflection part.

The invention discloses a balanced broadband band-pass filter with a stacked structure. The balanced broadband band-pass filter comprises a first layer wafer and a second layer wafer which are vertically stacked, a coplanar waveguide structure is adopted in the lower layer RDL of the first layer of wafer to realize differential input and output ports and two sections of coplanar waveguide transmission lines; a coplanar waveguide structure is adopted in the upper-layer RDL of the second-layer wafer to realize a differential input / output port and two sections of coplanar waveguide transmission lines, and the coplanar waveguide structure and the coplanar waveguide structure of the first-layer wafer form a differential pair; a coplanar waveguide structure is adopted in the upper-layer RDL of the first-layer wafer or the lower-layer RDL of the second-layer wafer to realize two sections of open-circuit stubs; a coaxial TSV structure and a single-hole copper cylinder TSV are integrated in the first layer wafer and the second layer wafer, and the coaxial TSV structure is used for realizing a vertical TSV transmission line and is coupled with the coplanar waveguide transmission line to form a resonant cavity; the single-hole copper cylinder TSV provides grounding reference for the coplanar waveguide structure and the coaxial TSV structure. According to the invention, a high-performance filtering function can be realized in a limited space.

Housing for two duplexers installed in a dual polarized dual band antenna. The invention provides a housing for two frequency selective devices, comprising a split strip conductor arranged inside the housing, the split strip conductor forming a series section of a transmission line and an open stub in parallel to the series section, the housing comprising a piece of metal profile comprising two cavities; each cavity has a polygonal shape in cross section and comprises wide walls and narrow walls; the cavities comprise at least two regions in which the distance between the wide walls differs by at least 20% and one narrow wall is at least 20% shorter than the other narrow walls forming the cavity; the section of the split strip conductor forming the open stub is arranged in a region in which the distance between the wide walls is larger compared to the other regions; wherein the narrow walls comprise openings in which ends of the split strip conductor forming the ports of the frequency selective devices are arranged; wherein the cavities have a common wide wall comprising a step arranged at a boundary between regions having different distances between the wide walls of the regions.

A Doherty amplifier circuit includes a divider configured to divide a received input signal into a first signal and a second signal, a circuit board, a first amplifier amplifying the first signal and output the amplified first signal as a fourth signal, a second amplifier and amplifying the second signal and output the amplified second signal as a fifth signal, a combining node combining the fourth signal and the fifth signal into a combined signal and output the combined signal to an output terminal as an output signal, an open stub, the open stub having an end electrically connected to a path between the divider and the first amplifier, and a first impedance converter, the first impedance converter having a first end electrically connected to the second amplifier and a second end electrically connected to the combining node.

A radio-frequency power amplifier circuit based on an asymmetric fishbone-shaped matching network, comprising a power amplifier transistor. An input end of the power amplifier transistor is connected to an input matching network, and an output end of the power amplifier transistor is connected to an output matching network; the input matching network and / or the output matching network is of an asymmetric fishbone-shaped structure; the asymmetric fishbone-shaped structure comprises backbone elements which are sequentially connected in series, and connecting points between adjacent backbone elements are connected to upper-row rib elements and lower-row rib elements; the upper-row rib elements and the lower-row rib elements are asymmetric; the upper-row rib elements and the lower-row rib elements are all configured as open stubs, and the upper-row rib elements or the lower-row rib elements are quarter-wavelength open stubs at a harmonic frequency; and the backbone elements and the rib elements are all matching network elements.

The invention belongs to the technical field of differential filters with double-layer structures, and discloses a miniaturized double-passband microstrip differential filter based on a double-layer structure, which is mainly composed of half-wavelength stepped impedance resonators and open-circuit branch microstrip lines on an upper metal coating and a lower metal coating, wherein the two symmetrical resonator structures are symmetrically arranged about the center of the metal grounding plate, the two open-circuit branch microstrip lines are connected at the center of the half-wavelength stepped impedance resonator, and a stepped gap and a square gap which are symmetrically arranged about the center of the metal grounding plate are etched on the grounding plate; the input ports 1 and 2 and the output ports 1 and 2 are respectively arranged at two sides of the centers of the two half-wavelength stepped impedance resonators, the center frequency is controlled by adopting the double-layer symmetrical half-wavelength stepped impedance resonators loaded by the open-circuit branches, and a control coupling structure of an etching step type and a square gap is adopted, so that the selectivity of a passband is improved, and the frequency of the passband is reduced; the size of the filter is reduced; and the common-mode gain in a passband is inhibited.

An electrical connector, a conductive terminal and a forming method of a conductive portion of the conductive terminal. The conductive portion of the conductive terminal includes two elastic arms elastically abutting against a metal pad of a circuit board. Each elastic arm includes a first arm portion and a second arm portion separated along an up-down direction. A contact portion is formed at a tail end of the second arm portion, which does not form an open stub. Each contact portion has a tearing surface, such that a distance between the two contact portions of the two elastic arms is minimized. The two contact portions of the two elastic arms are provided to be staggered along the front-rear direction, and the two tearing surfaces of the two elastic arms are staggered along a front-rear direction, thus preventing the two elastic arms from scratching and colliding with each other.

Various embodiments provide systems, devices, and methods for an antenna assembly included in an integrated circuit (IC) package. The antenna assembly may be used for near field wireless communication such as package-to-package and / or chip-to-chip communication. The antenna assembly may include a feed plate (e.g., a top feed) that is capacitively coupled to a first via and a second via. The feed plate may further be capacitively coupled to a loading structure. The first via may be conductively coupled to a ground potential. In some embodiments, the antenna assembly may further include a stub structure (e.g., an open stub or a short stub) that is conductively coupled to the second via. An impedance matching network may be coupled between the feed plate and an IC die that communicates using the antenna assembly. Other embodiments may be described and claimed.

A frequency selection device including a tubular conductive housing having a polygonal cross-section. The present invention provides a filter, comprising: a branched strip conductor disposed within the conductive housing, forming a series portion of a transmission line and an open stub connected in parallel with the series portion of the transmission line, and forming attenuation poles within a stop band of the filter; wherein the branched strip conductor is disposed within an elongated conductive housing having a wide wall and a narrow wall; wherein at least one narrow wall includes an opening, and an end of the branched strip conductor forming the filter is disposed at the opening; wherein the conductive housing includes at least two regions, wherein a distance between two wide walls in a first region is at least 20% greater than a distance between two wide walls in a second region; and the open stub is disposed in the first region. The filter structure of the present invention is simple, forming a pass band and a stop band separated by a narrow boundary band. The filter provides a low passive intermodulation value, low insertion loss, and low production cost.

The invention relates to the technical field of microwave communication, and discloses a high in-band rejection broadband band elimination filter. The filter is based on a micro-strip resonator, and a micro-strip open-circuit branch knot is loaded in the middle of the micro-strip resonator to form an axial symmetry structure. The structure is divided into three groups of parts with the same characteristic impedance along a symmetry axis, and the working bandwidth and the in-band suppression level of the filter can be flexibly adjusted by independently adjusting the impedance ratio of each group. The structure is simple, narrow slits do not need to be machined, and the machining difficulty and cost are remarkably reduced. Compared with the prior art, about 90% of relative working bandwidth can be obtained while 40dB high in-band suppression is realized, and the problem that high in-band suppression and broadband performance are difficult to consider at the same time is effectively solved.

The utility model discloses a low-profile multi-frequency micro base station antenna, and relates to the technical field of base station antennae, the low-profile multi-frequency micro base station antenna comprises a first frequency band module, a second frequency band module, a reflecting plate and a cover plate; the first frequency band module comprises a plurality of first radiation units, a first power distribution plate used for exciting the first radiation units and a parasitic unit, and the parasitic unit is provided with a first groove used for filtering to improve the isolation of the micro base station antenna; the second frequency band module comprises a plurality of second radiation units and a second power distribution plate used for exciting the second radiation units, the second power distribution plate comprises a second power divider corresponding to the second radiation units, and the second power divider is provided with an open-circuit branch structure used for filtering to improve the isolation degree of the micro base station antenna; the first frequency band module and the second frequency band module are accommodated through the reflecting plate and the cover plate. The isolation degree of the base station antenna is improved, and the overall efficiency of the base station antenna is improved.

The application relates to a long-delay low-loss wideband delay line of a lack of ground open-circuit branch coupling strip, and belongs to the field of microwave systems. The long-delay low-loss wideband delay line comprises a metal microstrip line layer, a dielectric layer and a metal ground layer which are sequentially connected from top to bottom; the metal microstrip line layer comprises a fork structure composed of a U-shaped main microstrip line, a first U-shaped open-circuit branch and a second U-shaped open-circuit branch; a coupling strip is added in the fork structure, the coupling strip is grounded through a metallized via, and a complementary defect ground of the open-circuit branch is designed at a non-coplanar metal ground. Two or more long-delay low-loss wideband delay lines are connected in series to form a cascade delay line. The application works in a sub-6 frequency band range, has a relative bandwidth of 31.6%, a maximum delay time of 1.3 ns and an average transmission loss of 0.5 dB; a cascade delay line formed by connecting four long-delay low-loss wideband delay lines in series has a maximum delay time of 7.4 ns and an average transmission loss of less than 2.6 dB. The application effectively solves the mutual coupling eddy current effect between adjacent transmission lines.

The utility model relates to the technical field of communication equipment, in particular to an antenna, which comprises a dielectric layer, a radiation layer and a radio frequency ground layer, the dielectric layer is provided with a first surface and a second surface which are oppositely arranged, the radiation layer is arranged on the first surface and comprises a radiator, a microstrip feeder, a first open-circuit branch knot and a second open-circuit branch knot, the radiator is connected to the microstrip feeder line, the microstrip feeder line, the first open-circuit branch knot and the second open-circuit branch knot are sequentially arranged at intervals, and the radio frequency ground layer is arranged on the second surface. Through the simulation experiment, the antenna has the advantage of high selectivity, and spectrum resources can be efficiently utilized.

The application provides a microstrip filter, comprising: a microstrip line arranged on the surface of a dielectric plate; one end of a first microstrip line is connected with a signal input end, the other end is connected with a second microstrip line in parallel, the other end of the second microstrip line is connected with a fourth microstrip line in parallel, the second microstrip line constitutes a first resonator of a hairpin structure, a third microstrip line constitutes an open stub structure connected in parallel with the second microstrip line and the fourth microstrip line perpendicularly, the other end of a second resonator of a hairpin structure constituted by the fourth microstrip line is connected with a sixth microstrip line perpendicularly, a fifth microstrip line constitutes an open stub connected with the fourth microstrip line perpendicularly, one end of a seventh microstrip line is connected with the sixth microstrip line in parallel, and the other end is connected with a signal output end, so that the problem of impedance mismatching between the input end and the output end of the filter can be solved.

A power distribution combiner (1) comprises: a combining terminal (11), two distribution terminals (12a, 12b), an absorption resistor (13) connected between the two distribution terminals, a first transmission line (14a) connected between the combining terminal and one of the two distribution terminals, a second transmission line (14b) connected between the combining terminal and the other of the two distribution terminals and having a length shorter than that of the first transmission line, and at least one first open stub (15) connected to the second transmission line.

The present invention relates to an open-circuited stub resonator and a method for screening finished antenna PCBs. The open-circuited stub resonator includes a rectangular shielding ring (1), an open-circuited stub (2) in the rectangular shielding ring, and a transverse stub (3) perpendicularly connected to a lower end of the open-circuited stub. The rectangular shielding ring has two long edges and two short edges. The two long edges include an upper long edge (11) and a lower long edge (12). An upper end of the open-circuited stub is not connected to the upper long edge of the rectangular shielding ring. The transverse stub has a first terminal (31) and a second terminal (32). The first terminal is a signal input terminal, and the second terminal is a signal output terminal. The length of the open-circuited stub is (2N + 1) * λ / 4), where N ∈ 0,1,2,3......, and λ is a wavelength corresponding to a working frequency of a resonance point to be measured. The open-circuited stub resonator is disposed at a periphery of the finished antenna PCB. The method for screening the finished antenna PCBs makes up for the deficiency in the prior art that only the antenna size is measured to screen the antenna PCBs.

A balanced line-unbalanced line converter includes a balanced-side line including a first transmission line having a first end portion as a first signal terminal and a second end portion short-circuited and a second transmission line having a first end portion as a second signal terminal and a second end portion short-circuited, an unbalanced-side line including a first transmission line portion having a first end portion as a third signal terminal and a second end portion as an open end, the first transmission line portion to constitute a first coupled line with the first transmission line and a second transmission line portion to constitute a second coupled line with the second transmission line, a first open stub connected to the first end portion of the second transmission line, and a second open stub connected to the unbalanced-side line, to constitute a third coupled line with the first open stub.

The embodiment of the present application relates to the technical field of filter, in particular to a kind of topology structure, band elimination filter and communication device, including input, output, first microstrip line, second microstrip line, third microstrip line, fourth microstrip line, fifth microstrip line, sixth microstrip line, seventh microstrip line, eighth microstrip line, first open stub, second open stub, third open stub, fourth open stub, fifth open stub and sixth open stub, first microstrip line and first open stub are connected to input, second microstrip line and second open stub are connected to output, first microstrip line, second microstrip line, third microstrip line and fourth microstrip line are connected together, fifth microstrip line, third microstrip line and sixth microstrip line are connected together. By the above mode, the embodiment of the present application can make that band elimination filter has the characteristic of high selectivity.

The invention discloses a polarization reconfigurable dual-frequency pulse source based on a self-oscillation antenna, which is composed of two layers of dielectric substrates, a first surface structure positioned on the upper surface of a first dielectric substrate, a second surface structure positioned on the lower surface of the first dielectric substrate, and a third surface structure positioned on the lower surface of a second dielectric substrate, the first surface structure comprises a patch antenna structure used for radiating 0-degree polarized signals; the second surface structure comprises a patch antenna structure used for radiating 90-degree polarized signals; the third surface structure comprises two self-oscillation networks and a polarization switching network, and each self-oscillation network is provided with a pair of symmetrical open-circuit stubs. According to the invention, dual-frequency-band simultaneous working can be realized, and dynamic polarization switching is realized. The method can be widely applied to the field of wireless energy transmission.

The application discloses a kind of topology structure of high-selectivity wideband band-stop filter and filter, the topology structure includes vertical microstrip line, one end of vertical microstrip line is symmetrically connected with the one end of first horizontal open stub and the one end of second horizontal open stub, the other end of vertical microstrip line is symmetrically connected with the one end of first horizontal microstrip line and the one end of second horizontal microstrip line, the other end of first horizontal microstrip line is connected input end, the other end of second horizontal microstrip line is connected output end;First horizontal microstrip line and input end are also terminated with third horizontal microstrip line and first vertical open stub between, second horizontal microstrip line and output end are also terminated with fourth horizontal microstrip line and second vertical open stub between;Third horizontal microstrip line and fourth horizontal microstrip line are symmetrically distributed on both sides of vertical microstrip line, and first vertical open stub and second vertical open stub are symmetrically distributed on both sides of vertical microstrip line.The application solves the problems that the existing band-stop filter structure is complex, the selectivity is poor, and the stop band is narrow.

To provide a Doherty amplifier circuit capable of being reduced in a size.SOLUTION: A Doherty amplifier circuit includes: a distributor that distributes a received input signal into a first signal and a second signal: a circuit board 55; a first amplifier that is provided on the circuit board, amplifies the first signal, and outputs the amplified first signal as a fourth signal; a second amplifier that is provided on the circuit board, amplifies the second signal, and outputs the amplified first signal as a fifth signal; a combining node that combines the fourth signal and the fifth signal and outputs the combined signal to an output terminal as an output signal; an open stub that is provided on the circuit board and has an end electrically connected to a path between the distributor and the first amplifier; and a first impedance converter that has a first end electrically connected to the second amplifier and a second end electrically connected to the combining node.SELECTED DRAWING: Figure 2

To provide a device configuration capable of suppressing an increase in the device scale even when the number of antenna elements constituting an array antenna becomes extremely large. [Solution] Stubs 32, 33 are formed on the left and right sides of a waveguide body 31 formed on a circuit board, and switches 51, 52 are provided for exclusively controlling these stubs 32, 33 so that one is an open stub with its tip open and the other is a short stub with its tip shorted. Also, a slot 34 is formed between the stubs 32, 33 of the waveguide body 31, and by using the switches 51, 52 to switch between the open stub and the short stub of the stubs 32, 33, two or more different types of excited electric or magnetic fields are generated in the slot 34, changing the direction of the antenna beam.