3 results about "Open loop resonator" patented technology

This invention belongs to the field of microwave antenna and RF front-end circuit technology, specifically relating to a broadband filter dielectric resonator antenna with wide harmonic suppression characteristics and a method for controlling its radiation characteristics. The method includes the following steps: obtaining an initial electromagnetic state parameter set and performing fundamental mode field distribution decoupling calculations; constructing an open-loop feeder partially coupled topology to generate a hybrid broadband response signal set; parsing the passband envelope and attenuation determination to map a folded open-loop resonator to generate lower stopband zeros; determining the harmonic frequency band energy density threshold to trigger a multi-topology notch filter to generate an upper stopband zero array; and compensating for phase group delay and gain flatness to output the converged final radiation state parameters of the antenna. This invention overcomes the problems of multimode interference between the feed network and the radiator, the inability to independently generate stopband radiation zeros, and nonlinear phase group delay shift caused by the lack of distributed notch filter node cooperative configuration.

The invention discloses a W-band GaAs on-chip integrated waveguide linear phase filtering network based on external phase equalization. Group delay planarization and size miniaturization are realized through an external equalization theory and an innovative resonant cavity layout and coupling mechanism. The core structure comprises a four-order SIW filter, a 3dB bridge, and two single-port reflection-type open-loop resonators. The output end of the four-order SIW filter is coupled with one port of the 3dB bridge, the two single-port reflective open-loop resonators are respectively connected with the other two ports of the 3dB bridge, and the last port of the 3dB bridge is used as the output port of the whole filter network.

A dual-frequency WiMAX filter based on an embedded split ring comprises an input coupling end, a resonance part and an output coupling end, and the input coupling end is an L-shaped folded microstrip line with three loaded branches; the resonance part comprises two same resonance units, and the two resonance units are arranged side by side and are distributed and arranged in a central symmetry manner relative to the central point of the filter; the structure of the output coupling end and the structure of the input coupling end form a mirror symmetry relation with respect to a symmetric line, and the symmetric line is the center line of the filter. According to the invention, the resonator embedded with the split ring is used, and for 2.45 and 3.5 GHz frequency points of WiMAX, the filter has better passband and stopband characteristics, and is relatively compact in size and relatively low in manufacturing cost.