RoF (radio over fiber) phased active integral antenna applicable to FDD (frequency division duplexing) system

Abstract

The invention discloses a RoF (radio over fiber) phased active integral antenna array applicable to an FDD (frequency division duplexing) system. The RoF antenna array comprises an optical module, an intermediate-frequency transmitting and receiving module, a plurality of radiofrequency transmitting and receiving modules and antenna units; and the optical module connected with a near-end machine is connected with the radiofrequency transmitting and receiving modules by the intermediate-frequency transmitting and receiving module, and each radiofrequency transmitting and receiving module is connected with the corresponding antenna unit. Compared with the traditional array antenna, the RoF phased active integral antenna array has the advantages that each antenna unit in the active integral antenna array is directly connected with the corresponding complete radiofrequency transmitting and receiving module, signals of each unit are subjected to power division / combination in intermediate frequencies, are connected with the optical module after being processed by the intermediate-frequency transmitting and receiving module, and finally can be converted into optical signals by the optical module, and the optical signals can be transmitted at low loss over long distances; and the phase of each radiofrequency transmitting and receiving module behind the corresponding antenna unit is controllable, and accordingly beams of the integral array can be scanned in the vertical direction.

Description

technical field [0001] The invention relates to an active antenna, in particular to an RoF phase-controlled active integrated antenna suitable for an FDD (Frequency Division Duplexing, frequency division duplexing) system. Background technique [0002] Antennas are one of the key components of various wireless communication systems. The main technical indicators to measure their pros and cons are: impedance bandwidth, beam width, sidelobe level, gain and efficiency, etc. The conductor loss, dielectric loss of the antenna radiating unit, the insertion loss of the feeding network and the loss of the feeder will greatly reduce the efficiency of the entire system, resulting in a considerable proportion of the transmitter power being dissipated by the antenna and the feeder, and seriously affecting the receiving sensitivity. Therefore, high efficiency and intelligence have become the research goals of the next generation of wireless communication antennas. [0003] A traditional...

AI Technical Summary

Problems solved by technology

We know that if the output power of an RF transmitter is doubled while maintaining linearity, its cost will increase by 0.8 to 1 times, and its DC power consumption will increase by 1 to 1.2 times.

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