30results about How to "Improve selection features" patented technology

The present invention proposes a filter power divider based on half-mode substrate integrated waveguide, which takes the substrate integrated waveguide rectangular cavity and the half-mode substrate integrated waveguide rectangular cavity as the basic resonant unit, and the adjacent rectangular cavities are realized by opening windows Magnetic coupling, open S-shaped slots to realize electrical coupling, there is a jumper isolation resistor between the openings of the second-order half-mode substrate integrated waveguide rectangular cavity, slot lines are set at the corresponding positions between the metal conductive layer on the lower surface and the opening, and the input and output terminals use Microstrip-coplanar waveguide structure. The substrate-integrated waveguide rectangular cavity includes a dielectric substrate whose upper and lower surfaces are covered with metal conductive layers, and the dielectric substrate is evenly distributed along the edge of the cavity with metal through holes penetrating the upper and lower metal conductive layers; the half-mode substrate integrated waveguide rectangular cavity consists of The substrate-integrated waveguide rectangular cavity is obtained by dividing along the magnetic wall. The invention has a compact structure and improves the isolation characteristic and out-of-band suppression performance of the filter power divider.

The invention discloses a three-band monopole antenna, which comprises a substrate, a first floor, a second floor, an antenna feeder and a radiation patch located on the same surface of the substrate. flush, the other end is connected to the radiation patch, the first floor and the second floor are symmetrically distributed with respect to the antenna feeder and the lower edges of the first floor and the second floor are flush with the lower edge of the substrate, the first floor and the second floor are aligned with the There is a coupling gap between the antenna feeders; the radiation patch includes thick branches and thin branches. The thick branches are in a semi-circular structure, and the thin branches are in an open ring structure, and the opening of the ring is bent and folded several times to form a circular ring. It is an arc structure of concentric circles, the thick branches are embedded in the ring structure of the thin branches and the two ends are connected with the opening ends of the rings of the thin branches. The three-band monopole antenna has the characteristics of novel and compact structure, small volume, high space utilization rate, etc., and can be used in communication frequency bands such as GSM, WLAN, and WiMAX.

A millimeter waveband filter is provided with a resonator formed by a pair of electric wave half mirrors in a transmission line of a waveguide allowing electromagnetic waves in a predetermined frequency range of a millimeter waveband to propagate in a TE10 mode, and allows frequency components centering on the resonance frequency of the resonator to pass therethrough. A high-pass filter which has a transmission line reduced in size so as to have a cutoff frequency matching an upper limit of a lower rejection band of a filter passband is formed in a transmission line between the end of the waveguide and the electric wave half mirror, thereby increasing the attenuation of the lower rejection band.

The invention provides an ultra wide band bandpass filter with a notch property. The ultra wide band bandpass filter comprises a T-shaped stub-loaded resonator, a first open ring resonator, a second open ring resonator, an input feeder line and an output feeder line. The input feeder line and the output feeder line are connected at left and right sides of the T-shaped stub-loaded resonator and are in gap coupling with the T-shaped stub-loaded resonator. The first open ring resonator and the second open ring resonator are symmetrically arranged at the left and right sides of the T-shaped stub-loaded resonator and are in gap coupling with the left and right sides of the T-shaped stub-loaded resonator. Through adoption of the T-shaped stub-loaded resonator, the bandwidth of a passband can be controlled well, a zero point is respectively generated at two sides of the passband, and the selectivity of the passband is improved. Through adoption of the open ring resonators, a notch stopband is generated, a location of center frequency of the stopband can be adjusted conveniently, the zero point is respectively generated at two sides of the stopband, and the selectivity of the stopband is improved.

The invention proposes a Ku-band ultra-narrowband microstrip bandpass filter. It includes a microstrip substrate, the reverse side of the microstrip substrate is used as a grounded metal plate, the first input / output port and the second input / output port are distributed on both sides of the microstrip substrate, and a first uniform transmission line unit is arranged on the front of the microstrip substrate , the second uniform transmission line unit, the first coupled feeder, the second coupled feeder, the third coupled feeder, the fourth coupled feeder, the first open branch, the second open branch, the first folded L-shaped structural unit, the second folded L-shaped Structural unit, rectangular structural unit, third open branch, fourth open branch. The invention has good passband selectivity, high out-of-band suppression, small size, light weight, planarization and low cost.