6 results about "Microstrip filter" patented technology

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 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.

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 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 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.