5results about How to "Working frequency bandwidth" patented technology

The application provides a deep-water longitudinal vibration underwater acoustic transducer with an acoustic low-pass filter structure and belongs to the technical field of deep-water transducers. The problem that the electric-acoustic performance of the longitudinal vibration underwater acoustic transducer is greatly deteriorated after an oil-filled cavity is introduced is solved. The transducer comprises a front cover plate, a piezoelectric crystal stack, a rear cover plate, an oil-filled cavity, an oil-filled slit and a pressure-resistant shell, the front cover plate and the rear cover plate are connected with two ends of the piezoelectric crystal stack respectively, the front cover plate, the piezoelectric crystal stack and the rear cover plate are all installed in the pressure-resistant shell, the annular gap between the rear cover plate and the pressure-resistant shell is the oil-filled slit, the annular gap between the piezoelectric crystal stack and the pressure-resistant shell is the oil-filled cavity, and the bottom of the pressure-resistant shell is provided with an oil filling hole. The transducer is mainly used for longitudinal vibration underwater acoustic transducers with low-frequency broadband characteristics in underwater working environments.

The utility model provides a broadband laminated patch antenna and a phased antenna array, the antenna comprises dielectric substrates, a radiation patch and a parasitic patch, the parasitic patch and the radiation patch are laminated, and a plurality of layers of dielectric substrates are arranged between the parasitic patch and the radiation patch; and the edge of the parasitic patch sinks inwards to form symmetrically distributed grooves which are used for prolonging a surface current path. By designing the symmetrically distributed groove structures at the edge of the parasitic patch, the flow path of surface current is successfully prolonged, a longer electrical length is realized under a limited physical size, and the working frequency band of the antenna is obviously widened; meanwhile, the parasitic patch and the radiation patch are arranged in a stacked mode through multiple layers of dielectric substrates, a multi-resonance-point coupling mechanism is formed, and the bandwidth is improved.

The application discloses a kind of based on waveguide structure's wideband 2-bits reconfigurable intelligent surface, which includes: waveguide structure and wideband 2-bits phase shift circuit, waveguide structure and wideband 2-bits phase shift circuit are connected by metal via hole;Waveguide structure includes metal patch, first dielectric substrate and second dielectric substrate;First dielectric substrate is connected with second dielectric substrate, and first dielectric substrate is above second dielectric substrate;Metal patch is located at the top of first dielectric substrate, and the upper surface of metal patch is etched with U-shaped groove, and wideband 2-bits phase shift circuit is located at the bottom of second dielectric substrate;Wideband 2-bits phase shift circuit includes PIN diode, microstrip transmission line and DC bias circuit;DC bias circuit and PIN diode are connected by microstrip transmission line, and DC bias circuit is used to control the connection state of PIN diode.The wideband 2-bits reconfigurable intelligent surface provided by the application has a wide working frequency band and high bit phase encoding characteristics.

This invention discloses a multi-stage, multi-segment differential broadband power divider based on a polyimide support bridge. The power divider includes a differential signal input unit, multiple differential signal output units, a multi-stage, multi-segment differential impedance transformation unit, and multiple polyimide support bridge structures. The differential signal input unit includes input differential pairs, and the differential signal output unit includes multiple output differential pairs symmetrically arranged about a center line. Multi-stage, multi-segment differential impedance transformation units are respectively arranged between the input differential pairs and each output differential pair. The differential impedance transformation sections are based on cascaded differential impedance transformation lines to achieve stepped differential impedance transformation. Thin-film resistors are placed at the connection points of adjacent differential impedance transformation sections to provide absorption and cancellation paths for signals reflected from the output ports. The polyimide support bridge structure achieves dielectric isolation between microstrip lines. This invention, through optimized design and integration processes, possesses advantages such as small size, strong anti-interference capability, and large operating bandwidth.

The application discloses an injection locking frequency multiplication device, a phase-locked loop and a method, which integrates a digitalized capacitance array in a resonant cavity of an injection locking frequency multiplier, and combines a frequency multiplication amplitude detection module and a feedback control module to form a closed-loop adaptive tuning structure, so that the equivalent capacitance and the resonant frequency of the resonant cavity can be adjusted in real time according to the amplitude change of a frequency multiplication signal, thereby effectively compensating for frequency drift caused by process deviation, power voltage fluctuation and temperature change, significantly widening the working frequency band of the injection locking frequency multiplier, improving locking accuracy and working stability, avoiding the phase noise deterioration and power consumption increase phenomenon caused by reducing the Q value of the resonant cavity or increasing the injection power to widen the locking range in the traditional scheme, enabling the frequency multiplier to realize wide frequency working and automatic calibration while maintaining good spectral purity and low phase noise, and being more suitable for a phase-locked loop and a radio frequency front-end circuit in a multi-frequency band and wideband communication system.