40 results about "Microwave propagation" patented technology

Systems and methods are taught for blocking the propagation of electromagnetic waves in parallel-plate waveguide (PPW) structures. Periodic arrays of resonant vias are used to create broadband high frequency stop bands in the PPW, while permitting DC and low frequency waves to propagate. Particular embodiments include clusters of small vias that effectively function as one large via, thereby increasing stop band bandwidth and maximizing parallel plate capacitance. Cluster vias can be configured to additionally provide a shielded and impedance matched route within the interior area of the cluster through which signal vias can connect transmission lines disposed in planes lying above and below the PPW. Important applications include electromagnetic noise reduction in layered electronic devices such as circuit boards, ceramic modules, and semiconductor chips.

A radar level gauge system comprising a transceiver for generating, transmitting and receiving electromagnetic signals; an antenna arranged to direct transmitted electromagnetic signals towards a surface of the product contained in the tank, and to return reflected electromagnetic signals resulting from reflections at impedance transitions encountered by the transmitted electromagnetic signals back to the transceiver; and a hollow waveguide connecting the transceiver and the antenna for guiding the electromagnetic signals therebetween. The radar level gauge system further comprises a leak indication member being movably arranged inside the hollow waveguide in such a way that a force resulting from leakage of the fluid at the sealing member causes a movement of the leak indication member which causes a change in at least one microwave propagation characteristic of the hollow waveguide.

The invention relates to a liquid crystal microwave modulation device and a modulation method thereof. The device consists of n liquid crystal cells with the same structure and n channels of driving voltage signal sources A, n=2~10; the structure of the liquid crystal cell is as follows from top to bottom: the first glass substrate, the first ITO electrode, the first An alignment layer, a liquid crystal layer, a second alignment layer, a second ITO electrode, and a second glass substrate; wherein, spherical resin spacers are placed in the liquid crystal layer, and the n liquid crystal cells with the same structure are stacked sequentially from top to bottom , the n-channel drive voltage signal source A is composed of n mutually independent waveform signal generators, and each waveform signal generator is correspondingly connected to a liquid crystal cell. In the present invention, the dielectric constant of each layer of liquid crystal in the direction of microwave propagation can be changed according to the multi-channel driving voltage signals set by the user, and the results of outgoing microwave interference and diffraction can be adjusted.

A pipeline inner wall detection system and method provided in embodiments of the present invention relate to the technical field of pipeline inner wall detection. The method comprises that the vector network analyzer device outputs microwaves and transmits the microwaves to the coaxial feeding end cover device; the coaxial feeding end cover device transmits the received microwaves into the pipeline to be tested, and when there is a When thinning, receive the echo signal reflected back by the thinning part of the inner wall of the pipe to be tested in the microwave; then the coaxial feeding end cover device will also transmit the received echo signal to the vector network analyzer device; the vector network The analyzer device also processes the echo signals to obtain thinning information at the thinning of the inner wall of the pipe under test. The wave impedance changes at the thinned part of the inner wall of the pipeline to be tested through microwaves, resulting in impedance mismatch, which causes the microwave to reflect at the thinned part in the time domain, and then processes the reflected echo signal to obtain the measured Thinning information at the thinning of the inner wall of the pipe. Improve detection accuracy.