31 results about "Dual band bandpass filter" patented technology

A dual-band bandpass filter having a first pass band and a second pass band respectively corresponding to a first frequency and a second frequency. The filter includes a first pair of resonators, a second pair of resonators and a first coupling element. The first pair of resonators includes a first resonator and a second resonator, which share a first grounding transmission line and are grounded through the first grounding transmission line to generate coupling. The second pair of resonators includes a third resonator and a fourth resonator, which share a second grounding transmission line and are grounded through the second grounding transmission line to generate coupling. The first coupling element connected between the first and second pairs of resonators makes the first and second pairs of resonators produce coupling such that the dual-band bandpass filter has the first and second pass bands.

The invention discloses a compact type UWB dual-band trap balancing band-pass filter, and belongs to the technical field of wireless communications. The compact type UWB dual-band trap balancing band-pass filter comprises a first filter, a second filter and supplement structures. The first filter and the second filter are in structural symmetry and respectively comprise a microstrip line structure formed on the upper layer of a dielectric substrate and a trough line structure formed on the lower layer of the dielectric substrate. In order to restrain common-mode harmonic waves and achieve dual-band trap characteristics, the supplement structures are additionally arranged in the microstrip line structures on the upper layers of the dielectric substrates, each supplement structure comprises a first microstrip branch knot, a second microstrip branch knot, a first harmonic oscillator, a second harmonic oscillator, a third harmonic oscillator and a fourth harmonic oscillator, wherein the first harmonic oscillator and the second harmonic oscillator are arranged on the two sides of the first microstrip branch knot in parallel, and the third harmonic oscillator and the fourth harmonic oscillator are arranged on the two sides of the second microstrip branch knot in parallel. The compact type UWB dual-band trap balancing band-pass filter has a wide different-mode signal passband and has the dual-band trap characteristics, a high common-mode restraining characteristic is achieved in the passband, the structure is compact, circuits are simple, and processing is easy.

A dual-band bandpass filter according to the present invention includes a plurality of dual-band bandpass resonators. The dual-band bandpass resonator includes a central conductor (11) having a central axis aligned with an input / output direction, a pair of grounding conductors (12), a central conductor short-circuit part (13) and a pair of stub conductors (14) that are formed on a surface of a dielectric substrate. The pair of grounding conductors are disposed on the opposite sides of the central conductor with a space interposed therebetween. The central conductor short-circuit part (13) short-circuits the pair of grounding conductors, and one end of the central conductor is connected to the central conductor short-circuit part.

The invention discloses a reconfigurable dual-band band-pass filter which comprises an upper microstrip line structure, a middle dielectric substrate, a lower grounding metal patch and a metal through hole, wherein the metal through hole penetrates through the microstrip line structure, the dielectric substrate and the grounding metal patch in sequence to enable the microstrip line structure to be connected with the grounding metal patch through the dielectric substrate; the microstrip line structure comprises a first resonator, a second resonator, a third resonator and a fourth resonator; the first resonator and the second resonator are coupled to form a group of resonators after being folded; the third resonator and the fourth resonator are coupled to form another group of resonators after being folded; through the two groups of resonators, the microstrip line structure integrally forms a grid-shaped structure; one end of each resonator is loaded with a variable capacitance diode. According to the reconfigurable dual-band band-pass filter provided by the invention, the integration level and the electromagnetic compatibility of the system are improved; two pass bands are independently reconfigurable and the absolute bandwidth is basically constant, so that the application requirement of the conventional dual-band wireless communication system can be better satisfied.