30results about How to "Wide range of bandwidth" patented technology

The invention discloses a wave-controlled array ultra-wideband radar antenna array based on array element feeding waveform control, belonging to the technical field of ultra-wideband radar. In free space, beam scanning is realized by digital sampling delay; in complex electromagnetic scattering environment, beam scanning or focusing is realized by changing the excitation waveform of each array element. After the excitation waveform of each array element is sampled by A / D to obtain the source waveform, it is generated by D / A after transformation processing in the digital domain. The wave-controlled array radar of the invention does not need a radio frequency phase shifter for beam scanning, but generates a focused beam and realizes focused beam scanning in the time domain or ultra-wide frequency range by controlling the excitation waveform of the array element and its waveform sampling delay. The antenna of the invention belongs to an ultra-wideband radar array, and the working frequency range can cover close to the highest frequency of DC to A / D and D / A data acquisition signals.

The invention discloses a remote bidirectional optical phase comparison method based on local end measurement and a realization device thereof. Two lasers separated at two different places are taken as light sources. The two lasers are connected through a remote optical fiber link. Output light signals of the two lasers are transmitted on the same optical fiber in opposite directions. The signal light of one laser is sent to the local end through the optical fiber link and carries out frequency beat with the other laser. The signal light of the other laser is sent to a remote end, is reflected, is returned back by the same way and carries out frequency beat with the signal light itself. Phases of two frequency beat signals are compared. The common mode phase noise of the optical link is passively eliminated, thereby comparing the two lasers. According to the method and the device, the structure does not refer to active compensation of the link noise, so closed loop control is unnecessary, a lock loss problem does not exist, and the reliability of a comparison loop is relatively high. The method and the device are not influenced by a transmission function of an interferometer, so the method and the device can be used for evaluating the phase noise of broadband signals.

The invention discloses an electromagnetic band gap structure for achieving ultra-wideband suppression of synchronous switching noise. The electromagnetic band gap structure is characterized in that arectangular notch is etched on each side of a power plane, and a microstrip line is led out from the middle point of the bottom of the notch; the microstrip line surrounds the power plane to the tailend of the next side in a counterclockwise direction, and the part of the microstrip line positioned at the next side surrounds the part of the microstrip line positioned at the side, which is led out from the rectangular notch at the side; the microstrip line is connected with the microstrip line of the adjacent structural unit to form an S shape; the central area of the power plane is hollow, and a square plane plate is inlaid in the central area; a rectangular notch is etched in the center of each of four sides of the square plane plate, and a microstrip line is led out from the middle point of the bottom of the rectangular notch and connected with the power plane. The electromagnetic band gap structure better reduces the lower cut-off frequency of noise suppression and effectively enlarges the bandwidth range of noise suppression, thereby achieving the ultra-wideband suppression of the synchronous switching noise between the power plane and a ground plane.

The invention provides a 90-degree active bridge with an ultra-broad band. The active bridge comprises a first all-pass filter network composed of 2n-stage cascade all-pass filters and a second all-pass filter network composed of 2n-stage cascade all-pass filters, wherein an angular frequency product of an i stage of the first all-pass filter network and a (2n-i+1) stage of the second all-pass filter network is a definite value, n is a positive integer, and i is in a range from 1 to 2n. According to the 90-degree active bridge with the ultra-broad band, the 90-degree active bridge is used in a broad band range of a baseband signal to perform a stable 90-degree phase shift for signals, the phase error range is less than 1 degree,two channels of signals which are subjected to the phase shift can be subjected to addition, subtraction and gain amplification, the active bridge can be excellently applied to the single side band output of the base band broad band signal close to zero frequency, simultaneously weak signal can be subjected to 100-time gain amplification, besides, the gain amplification is achieved and simultaneously the phase error range is controlled within 2 degrees, and the phase shift characteristic is stable.

The invention features the following: compressing the signals to make the signal capable of being transmitted on category 5e twist-pair; namely, the one route of signals on sending end are divided into multi routes of wideband compressed sub-signals which are synchronously transmitted on wired media in multi parallel routes; the receiving end receives each route of signals, and restores it to oneroute of original signals.

The invention discloses an ultra-wide-band low-noise singlechip integrated amplifier. The ultra-wide-band low-noise singlechip integrated amplifier comprises a primary amplifying circuit, a secondary amplifying circuit and a tertiary amplifying circuit, wherein the primary amplifying circuit comprises a first triode transistor; the secondary amplifying circuit comprises a second triode transistor and a third triode transistor; the tertiary amplifying circuit comprises a control current inputting end, a fourth resistor, a first filtering capacitor and a fourth triode transistor; the control current inputting end is connected to a base electrode of the third triode transistor through the fourth resistor; the fourth resistor and the base electrode of the third triode transistor are simultaneously grounded through the first filtering capacitor; an emitting electrode of the third triode transistor is connected to a base electrode of the fourth triode transistor; and a collector electrode of the fourth triode transistor is a signal outputting end of the tertiary amplifying circuit. By using the ultra-wide-band low-noise singlechip integrated amplifier, the service life of a battery is greatly prolonged, the parasitic inductance is greatly reduced, high-frequency gain is increased, and a bandwidth range is broadened.