14 results about "Microstrip filter" patented technology

The invention provides a third harmonic suppression film microstrip filter based on a mixed structure. Comprising a substrate, a pair of coplanar waveguide feeder lines used for being connected with an external circuit and playing a role in impedance matching, and a plurality of interdigital resonators used for generating passband characteristics of the filter, the hairpin resonator is used for generating a transmission zero point at the low end of the filter to improve low-end stop-band suppression, the 1 / 4 wavelength open-circuit lines are used for suppressing third harmonics of the filter, and the pair of coplanar waveguide feeder lines, the interdigital resonators, the hairpin resonator and the 1 / 4 wavelength open-circuit lines are all laid on the substrate. The plurality of interdigital resonators are located between the pair of coplanar waveguide feeders, the hairpin resonator is located between the plurality of interdigital resonators, the pair of coplanar waveguide feeders is connected with the interdigital resonators at two sides of the plurality of interdigital resonators, and the plurality of 1 / 4 wavelength open-circuit lines are connected with the pair of coplanar waveguide feeders in parallel.

This invention discloses a cross-shaped microstrip filter, belonging to the field of microwave RF passive device technology. The filter includes a dielectric substrate, an input microstrip line, an output microstrip line, two sets of series-arm resonant units, and two sets of parallel-arm resonant units. The series-arm resonant units are composed of microstrip inductors and interdigital capacitors connected in series, with the resonant frequency corresponding to the filter's center frequency. The parallel-arm resonant units are composed of microstrip inductors and surface-mount capacitors connected in series, generating low-frequency and high-frequency transmission zeros respectively. The four sets of resonant units converge at a common node to form a cross-shaped topology. This invention, through a modular cross-shaped architecture, allows direct mapping between the resonant units and the frequency response, simplifying debugging and increasing design efficiency. Modular cascading can achieve high-order filtering, significantly improving band-edge steepness and stopband suppression, making it suitable for microwave RF systems such as communication, radar, and satellite navigation.

The utility model belongs to the technical field of filter structures, and particularly relates to a KU-frequency-band low-loss microstrip filter structure design which comprises a machine body and a prompting mechanism, the two ends of the machine body are fixedly connected with connector assemblies, the prompting mechanism is arranged on the connector assemblies, the prompting mechanism comprises an outer cylinder detachably connected to the connector assemblies, and the outer cylinder is arranged on the machine body. The inner side of the outer cylinder is rotationally connected with an inner cylinder, an observation opening is formed in the end, close to the inner cylinder, of the outer cylinder, and a prompt mark is arranged on the surface of the end, close to the outer cylinder, of the inner cylinder. According to the utility model, the inner cylinder and the outer cylinder can move relatively when the joint assembly and the connector are loosened, so that a maintainer can judge whether the joint assembly and the connector are loosened by observing whether a prompt sign is exposed in the observation port or not; and relative rotation between the connector assembly and the connector can be hindered through friction between the outer barrel and the inner barrel, and the loosening situation is reduced.

The invention belongs to the field of thin film microstrip filters, and particularly relates to a miniaturized ultra-wideband planar filter. According to the invention, the bridge employs a compact branch structure, the length and spacing of the branch are optimized according to the electromagnetic coupling characteristics of the 3.1-10.6 GHz frequency band, and the matching conditions of the characteristic impedance, the resonator and the dielectric substrate are strictly satisfied; the planar coupling path of the bridge is further combined with the three-dimensional coupling of the gold wire to form a'planar + three-dimensional 'composite coupling mechanism, and by matching with the miniaturized configuration of the microstrip resonator, the overall size of the device is reduced by more than 30%, the group delay is greatly reduced (from 0.68 ns traditionally to 0.33 ns at 8.3 GHz), the coupling value between the resonators is remarkably improved, and finally, the ultra-wideband coverage is realized. And in-band interference signals can be effectively suppressed. The problems that in the prior art, traditional bridge coupling only depends on a plane structure, the coupling path is single, coupling value improvement is limited, and bandwidth and miniaturization are difficult to consider at the same time are effectively solved.

The application discloses a four-mode reconfigurable microstrip line filter integrated with reflection-free and multi-zero-point response, which adopts a single microstrip circuit topology with left-right symmetry and is composed of an upper branch band-pass filter circuit, a T-shaped joint structure, a pair of cross-shaped absorption branches, a pair of coupled line absorption branches, five groups of switch pairs and input and output ports; the coupled lines at the two ends of the upper branch band-pass filter circuit are connected with the ground through the switch pair connection ports and the T-shaped joint structure, and the absorption branches are connected with the ports in parallel through the switches; the four-mode switching of double-band rejection, full-band reflection-free band-pass, full-band reflection-free band-stop and multi-transmission zero-point band-stop is realized in the same circuit through the on-off control of the switches; the integration degree is improved; the reflection-free characteristic of the band-stop energy dissipation is realized by relying on the resistance-loaded absorption branches; the frequency selectivity and the band-stop suppression capability are strengthened in combination with the multi-transmission zero points; and the problems of low resource reuse rate, lack of reflection-free characteristic and uneven multi-mode performance of the traditional structure are solved.

A microstrip filter includes a first substrate (11) and a second substrate (12) disposed oppositely, and a dielectric layer (13) disposed between the first substrate (11) and the second substrate (12). The first substrate (11) includes a first base substrate (110) and a patch array disposed on a side of the first base substrate (110) close to the dielectric layer (13). The second substrate (12) includes a second base substrate (120), a microstrip line (121) disposed on a side of the second base substrate (120) close to the dielectric layer (13), and a ground layer (122) disposed on a side of the second base substrate (120) away from the microstrip line (121). The microstrip line (121) includes a main transmission line (1211) and at least one branch (1212). An orthographic projection of the branch (1212) of the microstrip line (121) on the first base substrate overlaps with an orthographic projection of the patch array on the first base substrate (110), and the dielectric layer (13) is configured to adjust a resonant frequency between the patch array and the microstrip line (121) when a voltage is applied to the patch (111) of the patch array.

This application discloses a dual-polarization radio frequency transceiver system and its package structure, including: a power amplifier chip, a limiting amplifier chip, a circulator, a switching chip, a first microstrip filter stub, and a second microstrip filter stub. In the transmit state, the circulator is used to unidirectionally transmit the radio frequency signal input to the power amplifier chip to the switching chip. The switching chip can switch the transmission path of the radio frequency signal so that the radio frequency signal is processed by the first microstrip filter stub or the second microstrip filter stub before being output. In the receive state, the circulator is used to unidirectionally transmit the radio frequency signal input to the first microstrip filter stub or the second microstrip filter stub after passing through the switching chip to the limiting amplifier chip before being output. This invention realizes the switching between horizontal and vertical polarization channels through the switching chip, and improves the second harmonic suppression ratio by utilizing the first and second microstrip filter stubs. The system is integrated into a miniaturized package structure and has good heat dissipation.

The application discloses a differential feed dual-band dual-polarized microstrip filter antenna, which comprises three layers of dielectric substrates arranged in a top-down interval, and the lower surface of the first layer of dielectric substrate is loaded with an octagonal ring-shaped coupling parasitic structure; the upper surface of the second layer of dielectric substrate is printed with a rectangular radiation patch, the rectangular radiation patch is loaded with four unclosed rectangular slots which are square distributed and rotationally symmetrical to each other, and the lower surface of the second layer of dielectric substrate is printed with a cross-shaped parasitic branch and four L-shaped symmetrical open circuit branches which are of the same structure and extend outward along the diagonal direction of the rhombus; the lower surface of the third layer of dielectric substrate is a metal floor; the second layer of dielectric substrate and the third layer of dielectric substrate are connected through a coaxial feeder; the differential feed technology is combined with the microstrip antenna, so that the dual-band dual-polarized filter antenna design with four radiation zeros is realized, the antenna has good edge selectivity and good out-of-band suppression capability, the in-band gain is stable, and the directional diagram has good symmetry and directivity.

The application belongs to the field of thin film microstrip filter, and particularly relates to a miniaturized ultra-wideband planar filter. The application adopts a compact stub structure through an electric bridge, the stub length and interval are optimized according to the electromagnetic coupling characteristics of the 3.1-10.6 GHz frequency band, and the matching conditions of the characteristic impedance and the resonator and the dielectric substrate are strictly met; and further, the planar coupling path of the electric bridge is combined with the three-dimensional coupling of the gold wire to form a composite coupling mechanism of 'planar + three-dimensional', cooperating with the miniaturized configuration of the microstrip resonator, the overall size of the device is reduced by more than 30%, while the group delay is greatly reduced (from the traditional 0.68 ns to 0.33 ns @ 8.3 GHz), the coupling value between resonators is significantly improved, and finally the ultra-wideband coverage is realized, and the in-band interference signals can be effectively suppressed. The application effectively solves the problem in the prior art that the traditional electric bridge coupling only relies on the planar structure, the coupling path is single, the coupling value is limited, and it is difficult to balance the bandwidth and miniaturization.

The utility model discloses a microstrip filter. The microstrip filter comprises a dielectric substrate which comprises a first surface and a second surface which are opposite and perpendicular to the thickness direction of the dielectric substrate; the microstrip transmission line is formed on the first surface; the reference ground is formed on the second surface; the at least one via hole is formed in the first surface and extends towards the second surface, and the depth of the at least one via hole is smaller than the thickness of the dielectric substrate; and the metal layer is filled in the at least one via hole, and the orthographic projection of the metal layer on the first surface is overlapped with the orthographic projection of the microstrip transmission line on the first surface. According to the microstrip filter, the metal layers are arranged in the through holes to serve as resonance branches, the three-dimensional space of the dielectric substrate can be fully utilized, product miniaturization is achieved, and meanwhile the large-bandwidth suppression effect is achieved.

The application discloses an integrated filter antenna and relates to the technical field of antennas.The integrated filter antenna comprises a dielectric substrate, a ground inductor and a radiation inductor are printed on the dielectric substrate, the radiation inductor is connected with a microstrip filter, the microstrip filter comprises a first open-circuit stub, an impedance line and a second open-circuit stub, one end of the impedance line is connected with the first open-circuit stub, the other end of the impedance line is connected with the second open-circuit stub, and the microstrip filter further comprises an impedance reference surface which is connected with the ground inductor.The integrated filter antenna has the radiation and filtering capabilities, and the structure size is more compact.

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.

The present application belongs to the field of antenna design, and relates to a filter array antenna, and specifically provides a wideband high-gain microstrip filter array antenna, which provides a beneficial reference method for the optimal design and performance improvement of the wideband high-gain filter array antenna, so that the wideband high-gain microstrip filter array antenna can be more widely applied to more scenes. The filter characteristics and the radiation characteristics of the rectangular patch unit structure are optimized by loading a short-circuit metal probe, opening a U-shaped slot and a rectangular slot, and loading an L-shaped branch, and the array structure is designed based on the unit structure. The filter and radiation characteristics of the array are further optimized by adopting the microstrip slot coupling feed probe excitation structure with inherent filter characteristics and resonance characteristics, and the 1*2 array topology structure in the form of mirror symmetry, so that the filter and radiation characteristics of the array are further optimized. Finally, the designed microstrip filter array antenna has the advantages of wideband and high gain, and the antenna structure is simple and convenient to process, and can be used to form a larger array to obtain higher gain.

The application provides a filter type waveguide coaxial conversion structure based on hairpin loop resonator, comprising: a coaxial connector for inputting or outputting TEM mode signal; a waveguide for transmitting TE mode signal; a filter probe structure connected between the coaxial connector and the waveguide; the filter probe structure comprises a dielectric substrate, a microstrip filter circuit arranged on the dielectric substrate and a metal probe; the microstrip filter circuit comprises a filter circuit composed of a hairpin loop resonator, which is used for filtering signals; one end of the microstrip filter circuit is connected with an inner conductor of the coaxial connector, and the other end of the microstrip filter circuit is connected with one end of the metal probe; the other end of the metal probe extends and is inserted into a cavity of the waveguide. The application aims to provide an innovative design scheme with small size, low loss, high selectivity and strong out-of-band suppression capability for high-frequency application scenarios such as millimeter waves.