117 results about "Microstrip resonators" patented technology

An oscillator configured to oscillate an electromagnetic wave, including: a negative resistance device; a microstrip resonator configured to determine an oscillation frequency of an electromagnetic wave excited by the negative resistance device; a resistance device and a capacitance device, which form a low-impedance circuit configured to suppress parasitic oscillation; and a strip conductor configured to connect the capacitance device of the low-impedance circuit and the microstrip resonator to each other, in which an inductance L of the strip conductor and a capacitance C of the microstrip resonator produce a resonance frequency of ½π√LC, and ¼ of an equivalent wavelength of the resonance frequency is larger than a distance between the negative resistance device and the resistance device of the low-impedance circuit via the strip conductor, is provided.

An oscillator oscillates a terahertz wave of a frequency f_osc defined by a microstrip resonator configured such that a negative resistance element and a dielectric body are sandwiched between two conductors. The oscillator includes a resistance element disposed in parallel to the negative resistance element. The resistance element is disposed in a position corresponding to a node of an electric field stably existing in the resonator in the frequency f_osc of the oscillated terahertz wave.

A microstrip stabilized quantum well resonance-tunneling generator which generates electromagnetic waves for millimeter and submillimeter wavelength range is provided The generator includes a resonant tunneling semiconductor quantum well diode, and a microstrip resonator. The resonant tunneling diode, the microstrip resonator and interconnecting lines and junctions are fabricated as a monolithic integrated device on a common substrate. As a result, the monolithic integrated device provides the expansion of the operation frequency range toward the terahertz region as a result of reduction of the parasitic inductance as well as of minimizing the other parasitic parameters of the electric circuitry connecting the resonant tunneling diode and resonator.

The invention discloses an electromagnetic hybrid coupling-based micro-strip duplexer, which comprises a double-faced copper-plated micro-strip board, wherein two filters with controllable passband frequency and bandwidth, a first port feeder, a second port feeder, a T-joint, a first port, a second port and a third port are formed on one surface of the double-faced copper-plated micro-strip board, and a copper-plated grounding plate is arranged on the other surface of the double-faced copper-plated micro-strip board; the two filters are respectively formed by three quarter-wave micro-strip resonators coupled with one another, a connection part at one end of the three resonators is provided with a grounding hole, and electric coupling is generated between every adjacent resonators in each filter. According to the duplexer, electric coupling is introduced on the basis of the original magnetic coupling, so that the bandwidth of the duplexer can be changed freely by adjusting the strength of the magnetic coupling and the electric coupling, and the improved filters can generate a plurality of transmission zero points near the upper and lower cut-off frequencies, so that mutual influence between the two filters can be reduced through adjusting the positions of the zero points.

The invention discloses a differential duplex filtering antenna with double-groove symmetrical excitation. The antenna comprises an upper dielectric substrate, a lower dielectric substrate, a metal floor, a first metal feed microstrip line, a second metal feed microstrip line, a metal rectangular radiation patch, a coupling gap, a metal microstrip resonator, a first metal microstrip split-ring resonator, a second metal microstrip split-ring resonator, a third metal microstrip split-ring resonator and a fourth metal microstrip split-ring resonator. According to the invention, a compact structure is used, functions of radiation, duplex synthesis, channel filtering, differential feeding and balance-unbalance conversion are realized at the same time, and good cross polarization performance, lobe symmetry and duplex filtering radiation capability are ensured.

The invention relates to a four-ordered cross-coupled bandpass filter, and in particular discloses a novel four-ordered cross-coupled substrate integrated waveguide bandpass filter. The bandpass filter comprises a dielectric substrate, metal patches, metal through holes and slots, wherein the metal patches are arranged on the surface and bottom surface of the dielectric substrate; the metal patch on the bottom surface is a ground layer; two rectangular cavities formed by metal through holes are formed in the middle part of the surface metal patch; a window is formed between the two rectangular cavities and used for cross coupling; a microstrip resonator which is directly connected with the corresponding rectangular cavity is arranged on the surface metal patch, and a micro resonator which is directly connected with the corresponding rectangular cavity is arranged on the lower part of the surface metal patch; the two sides of each rectangular cavity are connected with input and output microstrip lines; and slots are engraved at positions where the cavities and the input and output microstrip lines are connected. The novel four-ordered cross-coupled bandpass filter has a compact structure, relatively good frequency selectivity and relatively high Q value.

The invention is a controllable electromagnetic coupling microstrip split-ring resonator filter, comprising an input microstrip, an output microstrip and a microstrip resonator group, wherein the microstrip resonator group is one or more than one controllable electromagnetic coupling filter unit(s); the controllable electromagnetic coupling filter unit comprises two mutually coupled resonators, and the effective length of each resonator is as half as the work wave-length of the controllable electromagnetic coupling microstrip split-ring resonator filter; an opening is arranged at the top or bottom at a side of each resonator in the same controllable electromagnetic coupling filter unit; the opening positions of the two resonators are simultaneously positioned at the tops or the bottoms of the resonators, the edge on which the opening is located is adjacent to the coupled edges of the two resonators; and the positions of the two openings are centrosymmetric corresponding to the centerline of two coupled edges which is formed by a high-impedance line. The filter of the invention can achieve quasi-elliptic function filter characteristic, and has compact structure, small volume, low cost and good properties.

The invention relates to a coupling method of a microstrip filter and a microstrip resonator thereof. The resonator comprises a group of finger-inserting capacitors comprising microstrips, a group of double-helix curved inductors and a group of blocky capacitors formed with ground, wherein the microstrip comprises an upper-layer superconducting film, a lower-layer superconducting film and an artificial monocrystal medium positioned between the upper-layer and the lower-layer superconducting films; the finger-inserting capacitors are connected in parallel with the double-helix curved inductors, and the finger-inserting capacitors and the double-helix curved inductors connected in parallel are serially connected with the blocky capacitors; a line in the finger-inserting capacitors of the first resonator, which has the same charge polarity with an outermost line of the finger-inserting capacitor of the second resonator is shortened or cut off completely; and the outermost line of the finger-inserting capacitors of the second resonator is elongated and bent, extends into a line shortened or cut off completely in the finger-inserting capacitors of the first resonator and is coupled with two adjacent lines in the finger-inserting capacitors of the first resonator. The filter has less insertion loss, large out-band rejection, high band-edge gradient and good group delay performance.

The invention provides a four-frequency differential bandpass filter, and aims to improve the out-of-band selectivity of the four-frequency differential bandpass filter and reduce the in-band insertion loss. The four-frequency differential bandpass filter comprises a dielectric substrate; two first microstrip resonators, two second microstrip resonators, two step impedance microstrip lines and uniform impedance microstrip lines, which are symmetrical about the axis AA', are printed on the upper surface of the dielectric substrate; the uniform impedance microstrip lines are etched with a pair of interdigital coupling linear gaps, and are connected with the tail ends of high impedance microstrip lines of the two step impedance microstrip lines; a U-shaped input microstrip line is printed atone side of the axis AA'; a U-shaped output microstrip line is printed at the other side of the axis AA'; a metal floor is printed on the lower surface of the dielectric substrate; a first step impedance gap line and a first L-shaped step impedance gap line, which are connected, are etched at one side of the U-shaped output microstrip line on the metal floor; and a second L-shaped step impedance gap line and a second step impedance gap line, which are connected, are etched at one side of the U-shaped output microstrip line.

The invention discloses a band gap reconfigurable micro-band ultra wide band filter which mainly solves the problems that an ultra wide band in-band is uneven, a single-double band gap is reconfigurable, the band gap width is large, and insertion loss is large. The filter comprises a micro-band medium substrate (1), a pair of input-output micro-band feeder lines (3), a micro-band resonator (4), a band gap resonator (5) and a direct current biasing circuit (10). The band gap resonator (5) is arranged on the micro resonator (3) and is formed by two symmetrically-arranged stepped impedance resonators (51, 52) and a PIN tube (8). Each stepped impedance resonator is formed by a high impendence line (6) and a low impendence line (7). The direct current biasing circuit (10) provides variable voltage for the PIN tube (8), and achieves single-double band gap reconfiguration. The band gap reconfigurable micro-band ultra wide band filter can reduce pass band insertion loss, shorten band gap band width, achieve ultra wide band filter characteristics that a first band gap is capable of being switched on and switched off, and a second band gap is not changed and can be used for a wireless communication system.

Disclosed is a miniaturized superconducting filter with multiple transmission zero points, which is miniaturized while guaranteeing inner linearity phase characteristics of the pass band and outer high steepness of the pass band. The miniaturized superconducting filter consists of three groups of micro-strip resonators in cascade connection, each group includes four micro-strip resonators in cascade connection, and each resonator consists of an interdigital slow-wave structure and a clip resonance structure. A non-contact coupling micro-strip line is arranged between two resonators in each group, and the fourth resonator and the seventh resonator share the same node cross-coupling structure. The effective length of each resonator of the filter is one second of wavelength, and the substrate materials of the filter are MgO. The number of resonators for realizing six transmission zeros is reduced to 10 from 12 by the shared node cross-coupling structure, so that the filter is further miniaturized, and the problem of overlarge size of the existing filter with multiple transmission zeros is solved. Accordingly, the structure of the miniaturized superconducting filter is more applicable to manufacturing high-performance-index superconducting filters with multiple transmission zero points.

A microstrip resonator including a dielectric substrate, a resonance electrode on a first main surface of the dielectric substrate, and a ground electrode over an entire second main surface of the dielectric substrate. The resonance electrode includes a superconducting film and a metal film deposited in that order. The ground electrode includes a superconducting film and a metal film deposited in that order. The superconducting film functions as an electrode in low-temperature operation below a critical temperature, and the metal film functions as an electrode in high-temperature operation at or above the critical temperature. The length of the superconducting film of the resonance electrode is set to be longer than that of the metal film of the resonance electrode, so that the resonance frequency in low-temperature operation is substantially equal to the resonance frequency in high-temperature operation.

The invention relates to a tunable superconducting filter, and a manufacturing method and a metal shielding box of the tunable superconducting filter, wherein the tunable superconducting filter comprises a plurality of superconducting micro-strip resonators a superconducting micro-strip input connector and a superconducting micro-strip output connector; a semiconductor capacitance-variable diode for adjusting the frequency of the tunable superconducting filter and a fixed capacitor for isolating the direct current voltage of the semiconductor capacitance-variable diode are arranged on each superconducting micro-strip resonator; or two semiconductor capacitance-variable diodes which have opposite negative polarities and are used for adjusting the frequency of the tunable superconducting filter are arranged; and the superconducting micro-strip input connector and the superconducting micro-strip output connector are connected with external microwave circuits. In combination with the advantages of low microwave loss of a superconducting material, high tenability and quick response speed of the semiconductor capacitance-variable diodes and the like, the microwave tunable filter with high turning scope, wide narrow band, low loss and quick adjustable speed is manufactured.

The invention relates to a double-frequency microstrip antenna array with high isolation and belongs to the technical field of antenna design. The double-frequency microstrip antenna array comprises a medium substrate, microstrip antenna units and a C-shaped microstrip resonator, wherein the C-shaped microstrip resonator is arranged between the microstrip antenna units, and is a half-wavelength resonator. The double-frequency microstrip antenna array also comprises an inverted C-shaped defected ground structure which is etched on the grounding surface of the back surface of the medium substrate; and the inverted C-shaped defected ground structure can generate the stopband frequency which is adjusted by changing the length of an inverted C-shaped groove. The double-frequency microstrip antenna array provided by the invention has the advantages that the mutual coupling between array elements can be reduced on the two working frequencies of the antenna array simultaneously, the isolation of an antenna port can be improved; and displayed by a preferred embodiment, the isolation between the array elements is increased respectively by 10dB and 17dB on the two working frequencies.

The invention relates to a micro-strip resonator and a micro-strip filter. The micro-strip resonator has an asymmetrical structure and is formed by a micro-strip, wherein the micro-strip resonator is of a folded line shape and a starting section and a tail section of the micro-strip are iso-directionally arranged. Without complex design, the invention weakens the inter coupling between the resonators which are not adjacent so the frequency application scope of the filter is wider, the influence on a resonator Q value is small and the filter loss is not increased.

The invention relates to a low-coupling dual-frequency antenna array based on an H-shaped micro-strip resonator, belonging to the technical field of antenna designs. The low-coupling dual-frequency antenna array comprises a dielectric substrate, micro-strip antenna units and the H-shaped micro-strip resonator, wherein the micro-strip antenna units are rectangular micro-strip antennas, are symmetrically arranged at the both sides of the dielectric substrate, and have two working frequencies; the H-shaped micro-strip resonator is located between the micro-strip antenna units and used for generating resonance on the two frequencies respectively, and the formed indirect coupling route counteracts direct coupling between two array elements; the resonant frequency generated by the H-shaped micro-strip resonator can be adjusted by changing the lengths of upper and lower stubs. The low-coupling dual-frequency antenna array based on the H-shaped micro-strip resonator provided by the invention is capable of effectively reducing the coupling coefficient of a micro-strip antenna array without any additional cost, and is easy to process.

The invention provides a micro-strip resonator with a comb-shaped structure and a filter thereof. The invention is characterized in that the micro-strip resonator with the comb-shaped structure consists of a micro-strip line arrayed by folding, and the micro-strip line is folded and arrayed into an integral comb-shaped structural form; and the filter comprises an input micro-strip, an output micro strip and a plurality of micro-strip resonators with the comb-shaped structure. The invention has the advantages that the comb-shaped structure can reduce the size of the resonator, thus the structure is more compact; intercoupling between nonadjacent resonators is weakened so as to ensure that the design and the adjustment of circuits are simpler; and meanwhile, the formed filter has good frequency selectivity and stop band suppression characteristics. The micro-strip resonator not only can be used for manufacturing high-performance high temperature superconductivity filters, but also is suitable for manufacturing traditional plane type metal micro-strip filters.

The invention discloses a metamaterial-based wireless excitation small-sized microwave micro plasma array source. The array source comprises a transmitting antenna, a metamaterial structure-based microstrip resonator array and a dielectric plano-convex lens, wherein the transmitting antenna is a microstrip patch antenna, and comprises rectangular, circular, oval and circular annular patches and the like to feed through coaxial lines; the dielectric substrate of the metamaterial structure-based microstrip resonator array faces one side of the dielectric plano-convex lens; the array unit structure is a square or circular double-split resonant rings (DSRR) and the like; and the dielectric plano-convex lens is positioned between the transmitting antenna and the microstrip resonator array. Whenthe array source is in use, the microstrip patch antenna transmits microwave energy, and electromagnetic wave is uniformly propagated in a plane wave form through the dielectric plano-convex lens; and when the metamaterial structure-based microstrip resonator array suffers from resonance, the plane microwave micro plasma uniform arrays are excited in the gaps of the metamaterial structure. The array source has the advantages of miniaturization, wireless excitation plane microwave micro plasmas uniform arrays and the like.

The invention provides a patch antenna with a reconfigurable directional diagram. The patch antenna comprises a microstrip resonator group, a first dielectric plate, a metal floor, a second dielectricplate and a switchable feed network which are sequentially stacked from top to bottom; and the antenna also comprises a radiation patch which works in a high-order mode TM02 and a TM20, wherein the radiation patch is placed above a microstrip resonator group in a suspended manner. The microstrip resonator group is composed of a first microstrip resonator and a second microstrip resonator which are orthogonal to each other; and the feed network is used for feeding the first microstrip resonator and/or the second microstrip resonator. The antenna has the advantages of low profile, light weight,enough bandwidth, simple structure, simplicity in operation, beam reconfiguration, stable radiation and the like; a communication system can realize reconstruction of three beams by controlling a feed conduction path of the feed network under the condition of not changing a hardware structure and a station layout; and the requirements of different application scenes can be met.

The invention relates to a planar superconductive microstrip resonator, comprising a microstrip composed by upper and lower layer superconductive films and an artificial monomorph medium between the two layers of the superconductive films; be in characteristics that the microstrip is a complete shoestring, forming a geometrical pattern with an inner ring and an outer ring; the inner ring and the outer ring are not sealed. The advantages of the invention are following: the parasitical coupling is significantly weakened; the structure is more compact; because of the structure of the inner ring and the outer ring and the reverse direction of the inner ring and the outer ring, when the resonators of the invention are combined together, the coupling between the resonators is relevantly weak; in order to satisfy a certain coupling relation, the resonators must get closer; the integral structure can be more compact in this way;; furthermore, the distant field weak coupling means the significantly reduced influence of the parasitical coupling for three or more than three resonator combinations; the resonators provided by the invention can design and manufacture the narrow-strip superconductive band-pass filter based on the above situation.

The invention discloses a varactor electrically-adjustable micro-strip filter. The varactor electrically-adjustable micro-strip filter comprises an input micro-strip line, a first resonator, a second resonator, a third resonator, a fourth resonator and an output micro-strip line, wherein the first resonator and the fourth resonator are opened outwards and are arranged in parallel in a mirror image manner; the adjacent parts of the first resonator and the fourth resonator form magnetic coupling; the second resonator and the third resonator are opened inwards, arranged in parallel in a mirror image manner and positioned above the first resonator and the fourth resonator; the adjacent parts of the second resonator and the third resonator form electric coupling; and the input micro-strip line and the output micro-strip line are positioned below the first resonator and the fourth resonator respectively and are arranged in parallel in a mirror image manner. By adoption of the magnetic coupling and electric coupling cross coupling structure, the filter has the ellipse-like function characteristics and has transmission zero point on the sideband, so that the filter has good rectangular coefficient and improved filtering performance.

The invention discloses a single-cavity substrate integrated waveguide multi-transmission-zero-point filter. The single-cavity substrate integrated waveguide multi-transmission-zero-point filter comprises a top surface metal layer, a middle dielectric plate and a bottom surface metal layer which are stacked in sequence, wherein the top surface metal layer is provided with an input microstrip line, an output microstrip line, a dual-mode microstrip resonator, an interdigital type slot line and a vertical slot line; the vertical slot line is arranged in the vertical center line direction of the top surface metal layer; the dual-mode microstrip resonator is connected with one end of the vertical slot line; the interdigital type slot line and the vertical slot line are arranged in a crossed manner; metalized via holes are also formed in the middle dielectric plate; a substrate integrated waveguide cavity is formed between the middle dielectric plate and the top surface metal layer; and the top surface metal layer is used for obtaining at least four transmission zero points from high and low sidebands. By adoption of the single-cavity substrate integrated waveguide multi-transmission-zero-point filter, specific coupling topology is realized by only loading the microstrip resonator on the basis of not enlarging the area of an original circuit; and in addition, at least four transmission zero points are obtained from the high and low sidebands, so that the frequency selectivity is greatly improved.

The invention relates to a planar CQ (Cascade Quadruplet) band-pass filter which is made on a double-sized copper-coated micro-strip plate by a mode of a printed circuit board. An input end feeding head port 1 for inputting an electromagnetic wave signal, an output end feeding head port 2 for outputting the electromagnetic wave signal, a first port feeding line, a second port feeding line, a first half-wavelength micro-strip resonator, a fourth half-wavelength micro-strip resonator, a second quarter-wavelength micro-strip resonator, a third quarter-wavelength micro-strip resonator and a grounding through hole are respectively made on the same surface of the double-sized copper-coated micro-strip plate, and a copper-coated grounding plate is arranged on the other surface of the micro-strip plate. The planar CQ band-pass filter is formed by cascading the two half-wavelength resonators and the two quarter-wavelength resonators, so that the filter can have simple controlled functions of electric coupling and magnetic coupling when the filter has small volume; crossed coupling is introduced among the resonators, two transmission zero points can be generated at the two sides of a pass band of the filter, the frequency selectivity and out-of-band rejection of the filter are improved, and the planar CQ band-pass filter has the advantages of good frequency selectivity, low insertion loss, small volume and a simple structure.

A thin film resonator which combines a microstrip resonator structure and a coplanar resonator structure to form an integrated resonator structure. The resonant frequency of this resonator structure is independent of the substrate thickness within a certain thickness range. This resonator structure also has a very economical size, as compared to other existing resonator designs. Different coupling configurations between the resonators are shown with the resulting coupling coefficients. Also a two-pole, four-pole and an eight-pole filter are designed using the thin film resonator and the insertion loss and return loss characteristics for various filters are shown.