3 results about "Microstrip bandpass filter" patented technology

The invention belongs to the technical field of integrated circuit manufacturing and filters, and discloses a surface-mounted double-layer stacked microstrip band-pass filter. The filter comprises an upper metal layer, an upper substrate, a middle metal layer, a lower substrate and a lower metal layer which are sequentially arranged from top to bottom. A double-layer stacking method is adopted, the multi-order resonators are placed on the lower layer substrate, the upper layer metal layer, the side wall metalized through holes and the lower layer metal layer form a metal cavity structure, and the size of the filter is remarkably reduced; the multi-order resonator adopts a stepped impedance resonator structure, so that a low-frequency end zero point generated by high-order mode coupling can be effectively used, and better out-of-band rejection can be obtained; a ceramic substrate or a glass substrate with a relatively large dielectric constant is selected, so that the high-frequency loss of a passive device is remarkably reduced, and the quality factor is improved.

This invention discloses a miniaturized S-band microstrip bandpass filter, comprising an interdigital resonant unit and a hairpin resonant unit, with the hairpin resonant unit positioned in the middle of the interdigital resonant unit. This invention optimizes the left-end suppression performance of the interdigital microstrip bandpass filter by introducing a hairpin microstrip open-circuit line into the interdigital microstrip bandpass filter and forming a transmission zero at the left end through the structure of the hairpin resonant unit itself. Furthermore, the hairpin resonant unit is composed of U-shaped microstrip open-circuit lines, resulting in a small size that simultaneously meets the requirements of miniaturization and high suppression performance.

The embodiment of the invention provides a microstrip band-pass filter and a design method and device of the microstrip band-pass filter, and relates to the technical field of communication. The microstrip band-pass filter at least comprises a signal input end, a microstrip line structure and a signal output end, the microstrip line structure comprises a first bent open-circuit stub line, a second bent open-circuit stub line, a stub line with two open ends and a stepped impedance resonator; wherein one end of the first bent open-circuit stub is connected with the signal input end; the other end of the first bent open-circuit stub is connected with one end of the second bent open-circuit stub; the other end of the second bent open-circuit stub is connected with a signal output end; the stub line with two open ends is arranged on the inner side of the first bent open-circuit stub line and the second bent open-circuit stub line; and the stepped impedance resonators are arranged at the openings in the two sides of the stub line with the openings in the two ends. The filter has the characteristics of miniaturization, low cost and high performance.