8 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.

Printed microstrip filter. A printed film radio frequency microstrip bandpass filter includes: a plurality of resonators disposed on a dielectric substrate; a first input / output (I / O) interface and a second I / O interface connected to corresponding first and second resonators located on the sides of one or more intermediate resonators. The opposite ends of the one or more intermediate resonators are connected to a ground plane on the opposite side of the substrate via corresponding wires. The intermediate resonators have an electrical wavelength that is half the wavelength of the filter's center frequency, and the first and second resonators may have an electrical wavelength that is nominally half the wavelength of the bandpass filter's center frequency.

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 invention discloses a miniaturized S-band microstrip band-pass filter, which comprises an interdigital resonance unit and a hairpin resonance unit, and the hairpin resonance unit is arranged in the middle of the interdigital resonance unit. According to the interdigital microstrip band-pass filter, the hairpin microstrip open-circuit line is introduced into the interdigital microstrip band-pass filter, and a transmission zero point is formed at the left end through the structure of the hairpin resonant unit, so that the left-end suppression performance of the interdigital microstrip band-pass filter is optimized; moreover, the hairpin-type resonance unit is composed of the U-shaped microstrip open-circuit lines, is small in size, and can meet the requirements of miniaturization and high suppression performance at the same time.

The ultra-wideband microstrip band-pass filter comprises a dielectric insulating substrate, a plurality of groups of conductive microstrip patches positioned on the front surface of the dielectric insulating substrate, and a conductive grounding plate positioned on the back surface of the dielectric insulating substrate, the plurality of groups of conductive microstrip patches comprise two conductive microstrips which are respectively connected with the input port and the output port, two U-shaped microstrips which are positioned between the two conductive microstrips and are respectively connected in series with the two conductive microstrips, and a plurality of groups of terminal open circuit conductive branch lines which are loaded on the conductive microstrips and the U-shaped microstrips; the cross-shaped conductive micro-strip is located between the two U-shaped micro-strips, the two rectangular micro-strips are transversely connected to the upper end and the lower end of a vertical micro-strip in the cross-shaped conductive micro-strip respectively, and the two triangular micro-strips are loaded on the upper side and the lower side of the output end U-shaped micro-strip. The conductive grounding plate is of a conductive defected ground structure with two symmetrical rectangular gaps. According to the ultra-wideband band-pass filter, low insertion loss, low return loss and wide stop band of the ultra-wideband band-pass filter are realized.

A printed film RF micros trip bandpass filter includes a plurality of resonators disposed on a dielectric substrate, first and second input / output (I / O) interfaces connected to corresponding first and second resonators flanking one or more intermediate resonators. Opposite ends of the one or more intermediate resonators are connected to a ground plane on an opposite side of the substrate by corresponding conductors. The intermediate resonators have an electrical wavelength that is one-half a wavelength of a center frequency of the filter and the first and second resonators can have an electrical wavelength that is nominally one-half the wavelength of the bandpass filter center frequency.

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.

The present invention relates to a microwave passive device with reconfigurable functions and performance, belonging to the field of reconfigurable circuit technology. It comprises three layers of sequentially connected microstrip structure layers, dielectric layers and metal ground planes; two E-type microstrip patches, twelve microstrip lines, six PIN diodes, one varactor diode and four ports are centrally symmetrically arranged on the microstrip structure layer, which respectively constitute a microwave-tunable microstrip patch coupled antenna, a microwave-tunable cross-coupled microstrip bandpass filter and a microwave-tunable directional coupler. By adjusting the capacitance of the varactor diode, the frequency adjustment of the antenna, the frequency adjustment of the filter and the coupling degree adjustment of the coupler are achieved, and the performance of the microwave passive device can be reconfigured. This microwave passive device with reconfigurable functions and performance has a simple structure, a high structural reuse rate, a wide range of applications, and a high degree of integration. Functions can be quickly switched, performance can be quickly adjusted, and independent operation can be achieved without affecting each other.