47results about How to "Achieving Phase Compensation" patented technology

The invention discloses a miniaturized electric bridge device suitable for 10MHz-8GHz, which is characterized in that it includes an excitation signal input port P1, the excitation signal input port P1 is connected to one end of winding b, and winding b and winding a form a twisted pair Wound on the magnetic ring, winding c is also wound on the magnetic ring, the end of winding a and winding c close to the excitation signal input port P1 is connected and grounded, and the other ends of winding b and winding c are connected to resistor R2 and resistor R3 Between, the other end of the resistor R2 is connected to the resistor R1, an isolation port P2 is set between the resistors R1 and R2, the other end of the resistor R1 is connected to the test port P3, and the other end of the winding a is connected between the resistor R1 and the test port P3 between; the invention solves the problem that the application frequency of the existing twisted-pair transmission line magnetic ring directional bridge is difficult to increase.

The invention discloses a metasurface-based plane cassegrain vortex field antenna, and mainly solves the problem that an existing vortex field antenna is high in phase compensation error, low in radiation gain and complex in structure. The metasurface-based plane cassegrain vortex field antenna comprises a main reflecting mirror (1), an auxiliary reflecting mirror (2), a feed source (3) and a supporting structure (4); the main and auxiliary reflecting mirrors and the feed source adopt a positive forward mode; the virtual focal point of the auxiliary reflecting mirror coincides with the focal point of the main reflecting mirror, and the solid focal point coincides with the phase center of the feed source; the auxiliary reflecting mirror adopts a phase change metasurface structure; the mainreflecting mirror adopts a plane structure; and the main reflecting mirror comprises a main dielectric layer (11), a main reflecting layer (12) and main phase regulating and controlling layers (13), wherein the main phase regulating and controlling layers are uniformly arranged, formed by a main metal ring microstructure (131) integrally distributed in a spiral shape and are used for generating vortex electromagnetic waves. By virtue of the metasurface-based plane cassegrain vortex field antenna, the vortex electromagnetic wave is efficiently excited, the antenna phase compensation error is reduced, the gain is increased, the structure is simplified, and the antenna can be used for communication and radar.

The invention discloses a broadband Doherty power amplifier, comprising a power divider, a main power amplification network, an auxiliary power amplification network and a broadband compensation network. The broadband compensation network is the compensation network which is composed of a capacitor, an inductor, a resistor and a microstrip and has a special structure. According to the broadband compensation network, a phase compensation effect can be achieved in a relatively wide band, a signal can be amplified efficiently in a relatively wide frequency range, the relatively high backoff efficiency is achieved in the band, and in particular, the ultrahigh efficiency is achieved at a 6dB power backoff position. Through adjustment of parameters of the compensation network, the broadband Doherty power amplifier can be generalized to the Doherty power amplifiers of other bands, and the broadband Doherty power amplifier has wide application prospect and practical value.

The present application provides a pulse modulation device, transmitter, system and method for CV-QKD, wherein the pulse modulation device includes a first pulse laser, a second pulse laser, a third pulse laser, an optical beam splitter, a first light ring shaper, a second optical circulator, an optical modulation module, and a polarization beam combiner, wherein the optical beam splitter is used to divide the pulsed light output by the first pulsed laser into a first optical pulse and a second optical pulse, wherein the first The light pulse is injected into the second pulse laser, and the second light pulse is injected into the third pulse laser, so that the second pulse laser and the third pulse laser emit pulses of the same frequency and phase, and the produced reference light and signal light not only have good spectral quality, Moreover, it is not necessary to obtain a pulse with a high extinction ratio by cascading AMs, thus reducing the difficulty of obtaining pulse modulation. In addition, at least two high-performance AMs in the chopping scheme are saved, which greatly reduces the cost of pulse modulation.