Active antenna

About: Active antenna is a research topic. Over the lifetime, 2246 publications have been published within this topic receiving 26493 citations.

Near-field communication system and method of operation

Abstract: The present invention provides a near field communication system comprising a plurality of coils, a multiplexer electrically connected to the coil, and at least an adaptive network, electrically connected to the multiplexer. The coil is coupled to a portable antenna apparatus, wherein each of the two adjacent coil portions overlapping each other. The multiplexer selectively enabling at least one coil to establish communication with the antenna, having the optimum coupling effect between the multiplexer and the enable coil receiving antenna, and the receiving coil to enable merged an effective antenna; the adaptive network used to adjust the input and output of the active antenna.

Low Phase Noise Fiber Optics Links for Space Applications

Abstract: : This paper summarises the results obtained on different systems dedicated to the optical distribution of high spectral purity RF and microwave signals in a satellite payload or towards the elements of an active antenna. First, the interest of the photo-oscillator receiver for these applications in the RF frequency range is pointed out. Then, different emitter configurations are investigated in the microwave range . Finally, an application of these low phase noise microwave links in the field of time-frequency metrology i.e. an ultra high sensitivity microwave frequency discriminator, is addressed.

Ventilation pipe with microwave radiation antenna devices

Abstract: A ventilation passage arranged with a microwave active antenna device is provided, which relates to a ventilation passage used for central air-conditioning. Aims at that the ventilation passage of the current central air-conditioning kills the virus in the flowing air by filtering, spraying medicine liquid, ultraviolet lamp shining and other ways, which has the defects of complication and inconvenient operation, low efficiency and high cost, and provides a ventilation passage which adopts microwave electrical technology disinfection and is arranged with a microwave active antenna device. The adopted technological proposal is that a microwave antenna output end 1 is arranged on the wall of a ventilation passage 2.

Multimode active antenna

Abstract: The utility model relates to a radio frequency integrated circuit designs the field, especially relates to a multimode active antenna, including the antenna casing, install antenna circuitry and antenna coil in the antenna casing, the basis is novel carries out signal transmission through a radio frequency cable, simple structure of the circuit, big dipper generation low -noise amplifier has realized enlargeing big dipper generation S frequency dot signal, use multistage band pass filter filtering interfering signal simultaneously, two take the place ofs low -noise amplifier that share with GPS of the big dipper have realized enlargeing B1L1 frequency dot signal, the big dipper of limiter diode protection simultaneously two take the place ofs low -noise amplifier that share with GPS do not damaged by high -power signal, the big dipper generation power amplifier mainly enlarge the transmission signal of a big dipper generation, the synthesis and the separation of each signal are frequently mainly realized to the multiplexer, realize the transmission of each frequency dot signal through a radio frequency cable.

Active antenna for superwide spectrum

Abstract: The utility model relates to an improved active antenna device for a super wide working frequency band. The utility model is composed of a triangular core vibrator outdoor antenna with additional vibrators, a filtering matching network of the super wide working frequency band, an amplifying circuit, a coupling circuit, a particular frequency gain adjusting circuit and a power circuit. The utility model is characterized in that the input end and the output end of the amplifying circuit are respectively provided with a diode D1, a capacitor C2, a diode D2, a diode D3, a capacitor C5 and a diode D4, which forms a pi type strong pulse clamping protection circuit. The power circuit is provided with an instantaneous high voltage pulse protection circuit which is composed of a primary coil L7 of a power transformer, a fuse X and a pressure sensitive device R7. The device has firmness, high durability, same frequency prevention, adjacent frequency prevention, strong channel interference prevention, signal gain of strong channels and weak channels, high efficiency and low malfunction, and besides, both reliability and stability are better than the existing antenna device.