4 results about "Resonant filter" patented technology

This invention discloses a surface acoustic wave (SAW) device, comprising: a resonant filter element including multiple parallel resonators, one end of which is connected to at least one ground port; wherein at least two of the parallel resonators are connected to the same ground port, and the ground port connected to the at least two parallel resonators is a common ground port; and a packaging substrate located on one side of the resonant filter element; the packaging substrate includes a first substrate, which includes a common ground region and at least one independent cut-out region; the independent cut-out region is correspondingly disposed to at least one of the common ground ports and connected to the corresponding common ground port; the independent cut-out region is connected to the common ground region through a connecting portion, the extension direction of which is perpendicular to the SAW propagation direction of the SAW device. This invention improves the isolation performance of the device.

The embodiment of the present application provides a kind of generation method, equipment and radio frequency transmitter of radio frequency signal, wherein the method comprises: the initial signal is mixed with first local oscillator signal and second local oscillator signal respectively, to obtain first output signal;The first output signal is resonant filtered using target filter parameter, to obtain second output signal, wherein the target filter parameter is set to be used to suppress third harmonic generated in signal transmission process, wherein the first harmonic, the second harmonic and the third harmonic are harmonic components for generating third-order intermodulation signal and image signal.By the present application, the problem that the efficiency of suppressing interference signals in the output signal is low is solved, and the effect of improving the efficiency of suppressing interference signals in the output signal is achieved.

This invention discloses an ultra-narrowband optical filter and its design method, belonging to the field of micro-nano optical device technology. It is a reflective all-dielectric guided-mode resonant filter, comprising, from bottom to top, a substrate, a planar waveguide layer, a single-layer one-dimensional subwavelength grating layer, and a single-layer anti-reflection film. The design method includes initial tuning of the resonant wavelength, optimization of the ultra-narrowband bandwidth, fine-tuning of the resonant wavelength, and synergistic optimization of sideband suppression. It clarifies the priority of adjusting each structural parameter, achieving narrowband reflection filtering through the guided-mode resonance effect of the grating and waveguide layer. Through the synergistic design of the single-layer anti-reflection film and the resonant structure, non-resonant broadband background reflection is suppressed without disrupting the ultra-narrowband resonant peak. At the target filtering wavelength of 1064nm, an ultra-narrowband filter with a peak reflectivity of 100% and a full width at half maximum (FWHM) as low as 0.03nm can be achieved, with a sideband suppression ratio exceeding 30dB. This solves the core defect of existing technologies that cannot simultaneously achieve ultra-narrowband filtering and high sideband suppression ratio.