How to Ultra high frequency?

Q: How to Ultra high frequency?

Method and system for determining wave-head time,Method and device for dual-frequency RFID tag generation and anti-counterfeit checking of automobile accessories,Portable terminal equipment,High frequency receiving apparatus

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4 results about "Ultra high frequency" patented technology

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Ultra high frequency (UHF) is the ITU designation for radio frequencies in the range between 300 megahertz (MHz) and 3 gigahertz (GHz), also known as the decimetre band as the wavelengths range from one meter to one tenth of a meter (one decimeter). Radio waves with frequencies above the UHF band fall into the super-high frequency (SHF) or microwave frequency range. Lower frequency signals fall into the VHF (very high frequency) or lower bands. UHF radio waves propagate mainly by line of sight; they are blocked by hills and large buildings although the transmission through building walls is strong enough for indoor reception. They are used for television broadcasting, cell phones, satellite communication including GPS, personal radio services including Wi-Fi and Bluetooth, walkie-talkies, cordless phones, and numerous other applications.

Method and system for determining wave-head time

ActiveCN104614578AAccurately judge the degree of dangerAccurately determineTesting dielectric strengthCurrent/voltage measurementWindow WidthUltra high frequency

The invention discloses method and system for determining wave-head time. The method comprises the steps of receiving an UHF (Ultra High Frequency) signal sent by an UHF sensor; calculating the accumulated energy value of the UHF signal according to the accumulated energy calculation formula; calculating each short window value by a first preset formula according to the preset short window width and the accumulated energy value; calculating the long window value of a long window, corresponding to each short window value by the second preset formula; calculating the ratio of each short window value to the corresponding long window value; finding out the time corresponding to the starting position of the short window corresponding to the maximum ratio to be used as the wave-head time. With the adoption of the method, the wave-head time of the UHF signal can be accurately determined.

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Owner:STATE GRID CORP OF CHINA +1

Method and device for dual-frequency RFID tag generation and anti-counterfeit checking of automobile accessories

InactiveCN108898194AComplex information storageComplex functionCo-operative working arrangementsCommerceDual frequencyComputer hardware

The invention is applicable to the field of Internet of Things, and provides a method and a device for generating dual-frequency RFID tags of automobile accessories and anti-counterfeit checking. Themethod comprises the following steps of: generating the ultra-high frequency traceability code and the high frequency traceability code of the dual-frequency RFID tag according to the related information of the automobile accessories and sending them to the automobile accessories server for storage; Controlling the RFID reader to write the UHF traceability code and the HF traceability code into the RFID chip of the dual-frequency RFID tag corresponding to the automobile accessories; When the anti-counterfeit inspection is carried out on the automobile accessories, controlling the RFID reader to read the UHF traceability code and the HF traceability code of the dual-frequency RFID tag attached to the automobile accessories, and if the information corresponding to the UHF traceability code and the HF traceability code is consistent with the information stored in the automobile parts server, the dual-frequency RFID tag is determined to be a legal tag. The invention has high security against counterfeiting.

Method and device for dual-frequency RFID tag generation and anti-counterfeit checking of automobile accessories

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Owner:SHENZHEN POLYTECHNIC

Portable terminal equipment

InactiveCN107437649ASecure long-range wireless communicationSecure short-range wireless communicationsAntenna supports/mountingsPortable casingsCode division multiple accessElectric power

The present invention relates to the portable terminal giving the connecting means (13) to the other side of the slit (S) with giving the resonance circuit part (30) consisting of the resonating capacitor (Cr) working in the ultra-high frequency to the short circuit and it passes the high frequency signal power through works in the low frequency to the opening and cuts off the low-frequency signal electricity and the resonance inductor (L2) working in the low frequency to the short circuit and it passes the low-frequency signal electricity through works in the ultra-high frequency to the opening and cuts off the high frequency signal power to one side of the slit (S) and does to the upper plate (10a) and under plate (10b) to the radiator and in addition, guarantees the local area wireless communication of the low-frequency antenna (RX) including the code division multiple access of the high frequency antenna (A).