8 results about "Band notch" patented technology

There is provided a broadband signal tap (10) comprising a housing (12) and a cover (14) adapted to be removable from and attachable to the housing (12), the housing (12) comprising a power continuity connector (24) and the cover (14) comprising at least one external subscriber port (16), wherein at least one electrically conductive pad (32, 34) is disposed within the housing (12) to physically and electrically contact the housing (12) and the power continuity connector (24) and so remove resonant effects. The at least one electrically conductive pad (32, 34) comprises a first portion (56, 62) for engaging with the housing and a second portion (58, 60) for engaging with the power continuity connector (24). A cover (14) incorporating at least one electrically conductive pad (32, 34) is also provided.

The utility model provides an antenna and communication equipment. The radiation layer comprises a radiator, a micro-strip feeder line, a first micro-strip resonance unit and a second micro-strip resonance unit. In the first direction, one end of the microstrip feeder line is connected with the radiator. A first space is formed in the side, close to the radiator, of the microstrip feeder line, the radiator comprises a first extending part, and a first gap is formed between the first extending part and the microstrip feeder line. And along the second direction, the first micro-strip resonance unit and the second micro-strip resonance unit are respectively arranged at two sides of the micro-strip feeder line at intervals. And the radio frequency ground layer is arranged on the second surface, and the radio frequency ground layer is coupled with the radiation layer. A first gap is formed between the first extension part and the microstrip feeder line, so that the antenna has an in-band notch characteristic, and the first microstrip resonance unit and the second microstrip resonance unit are arranged on the two sides of the microstrip feeder line at intervals, so that the antenna has an out-of-band high selection characteristic. And in-band notch and out-of-band high selectivity can effectively suppress in-band interference and efficiently utilize spectrum resources.

The application discloses a long-wave infrared polarization-independent narrow-band trap filter and a preparation method thereof, and belongs to the technical field of infrared optical devices. The long-wave infrared polarization-independent narrow-band trap filter comprises periodically arranged two-dimensional grating units, and each of the two-dimensional grating units comprises a substrate, a waveguide layer arranged on the substrate, a grating structure layer arranged on the waveguide layer, a grating anti-reflection layer arranged on the grating structure layer, and a back anti-reflection film arranged on the side of the substrate away from the waveguide layer. The grating structure layer adopts a cross-shaped grating structure, which has the same period Lambda in the x and y directions and is distributed in a 90-degree rotational symmetry. Under the symmetrical structure, TE and TM polarized light experience the same phase matching condition, so that the resonance characteristics are not sensitive to the polarization direction of incident light, and thus polarization-independent filtering is realized.

There is provided a broadband signal tap (10) comprising a housing (12) and a cover (14) adapted to be removable from and attachable to the housing (12), the housing (12) comprising a power continuity connector (24) and the cover (14) comprising at least one external subscriber port (16), wherein at least one electrically conductive pad (32, 34) is disposed within the housing (12) to physically and electrically contact the housing (12) and the power continuity connector (24) and so remove resonant effects. The at least one electrically conductive pad (32, 34) comprises a first portion (56, 62) for engaging with the housing and a second portion (58,60) for engaging with the power continuity connector (24). A cover (14) incorporating at least one electrically conductive pad (32, 34) is also provided.

The utility model discloses a millimeter wave planar antenna with a notch characteristic. The millimeter wave planar antenna comprises a dielectric layer; the radiation layer is located on the first face of the dielectric layer, the radiation layer comprises a radiation body and a microstrip feeder line, and a cross-shaped gap is formed in the center of the radiation body; the radio frequency ground layer is located on the second surface of the dielectric layer, the radio frequency ground layer comprises a metal patch, and an inverted U-shaped gap is formed in the metal patch; the device is simple in structure, has excellent radiation performance, also has the advantage of in-band notch, and can effectively suppress in-band interference.

The utility model discloses a topological structure of a broadband band-pass filter with a notch characteristic and the filter, the topological structure comprises an input end, a first parallel line, a second parallel line, a third parallel line and an output end which are connected in sequence, and the first parallel line and the third parallel line are symmetrical about the second parallel line; the input end is also connected with a first microstrip line, and the first microstrip line is connected with a first open circuit branch; a second microstrip line is connected between the first parallel line and the second parallel line, the other end of the second microstrip line is symmetrically connected with a third microstrip line and a fourth microstrip line, and the other end of the third microstrip line is symmetrically connected with a first short-circuit branch knot and a second short-circuit branch knot. The other end of the fourth microstrip line is symmetrically connected with a third short-circuit branch and a fourth short-circuit branch, and the first short-circuit branch and the third short-circuit branch are symmetrical about the second microstrip line. The miniaturized broadband band-pass filter designed based on the topological structure has the advantages of in-band notch characteristics and high selectivity.

The application discloses a zero intermediate frequency satellite communication signal processing method and system based on an embedded microcontroller, and the method comprises the following steps: encoding and framing original data, generating I / Q digital baseband waveforms through QPSK mapping, upsampling and shaping filtering, and converting analog signals through a double-channel DAC. In view of Sinc fading and adjacent channel leakage caused by the zero-order holding effect of the DAC, two-stage cascade suppression is adopted: the first stage of attenuation is performed in the digital domain; the second stage of physical filtering is performed in the analog domain between the DAC and the mixer by using the stop band notch characteristic of the symmetrical active differential low-pass filter circuit, and the independent direct current bias adjustment is used for IQ balance adjustment to eliminate the carrier leakage. Finally, the mixer is used for one-step up-conversion, and a power amplifier is used for emission. The method does not need closed-loop digital IQ correction, significantly reduces resource consumption, and improves the adjacent channel power ratio and radio frequency quality.

A radiation layer comprises a radiation body, a 50 ohm feed line, an L-shaped microstrip line and a rectangular metal patch, the radiation body comprises a rectangular radiation part and two trapezoidal radiation parts, and the two trapezoidal radiation parts are respectively attached to two transverse side edges of the rectangular radiation part. The transverse side edges of the rectangular radiation parts coincide with the bottom edges of the trapezoidal radiation parts, the top edges of the trapezoidal radiation parts are arranged away from the rectangular radiation parts, the two trapezoidal radiation parts are symmetrical about the rectangular radiation parts, the 50-ohm feeder line is arranged on one longitudinal side edge of each rectangular radiation part, and the L-shaped microstrip line and the rectangular metal patch are arranged on the two sides of the 50-ohm feeder line respectively. And gaps are formed between the L-shaped microstrip line and the 50-ohm feeder line and between the rectangular metal patch and the 50-ohm feeder line. The millimeter wave broadband planar omnidirectional antenna has the advantages of in-band notch and high selectivity, and can effectively suppress in-band interference and efficiently utilize spectrum resources.