Photovoltaic millimeter wave power synthesis circuit

Abstract

The invention discloses a photovoltaic millimeter wave power synthesis circuit, which comprises a first load, a second load, a micro-strip line group and photoelectric conversion modules, wherein the micro-strip line group is formed by sequentially connecting N micro-strip lines in series; one end of the micro-strip group is connected to one end of the first load, while the other end of the micro-strip line group is connected with one end of the second load; both the other end of the first load and the other end of the second load are grounded; a common connection end of every two adjacent micro-strip lines in the micro-strip line group is connected with one photoelectric conversion module; each photoelectric conversion module is grounded; and each photoelectric conversion module is formed by sequentially connecting M photoelectric conversion units in series, wherein the N is greater than or equal to 3, and the M is greater than or equal to 2. The photovoltaic millimeter wave power synthesis circuit has the advantages that not only photoelectric conversion output power is increased but also output cutoff frequency is increased, so that work bandwidth is widened.

Description

technical field [0001] The invention relates to a power synthesis circuit, in particular to an optical-generated millimeter wave power synthesis circuit. Background technique [0002] Optical fiber communication has the characteristics of low loss and high bandwidth. Radio over Fiber (ROF) technology is a newly developed wireless access technology that combines optical fiber communication and wireless communication to meet the needs of high-speed and large-capacity wireless communication. The ultra-wideband wireless access network composed of the radio-over-fiber (ROF) system realizes the long-distance connection between the central processing station and the base station through the optical fiber, and realizes the wireless coverage within tens of meters through the millimeter-wave system. Its working mode is mainly : The central processing station modulates the data and the millimeter-wave signal using an external modulation technology based on optical carrier suppression ...

AI Technical Summary

Problems solved by technology

The ultra-wideband wireless access network composed of the radio-over-fiber (ROF) system realizes the long-distance connection between the central processing station and the base station through the optical fiber, and realizes the wireless coverage within tens of meters through the millimeter-wave system. Its working mode is mainly : The central processing station modulates the data and the millimeter-wave signal using an external modulation technology based on optical carrier suppression (OCS) to obtain a double-peak optical signal. The double-peak optical signal is beaten to recover the modulated millimeter-wave signal, and then the modulated millimeter-wave signal is amplified by the millimeter-wave power amplifier and radiated by the transmitting antenna; however, the millimeter-wave power amplifier is not only expensive, but also has serious problems. It is difficult to meet the linearity requirements of complex modulation methods with high spectral efficiency, and it is also not conducive to the goal of low-cost and maintenance-free base stations; therefore, a method using erbium-doped fiber amplifiers to transmit signals in After the optical domain is amplified, it is directly sent to the photodetector, and the photodetector recovers the beat frequency of the received double-peak optical signal to obtain a solution that the millimeter wave signal is directly radiated by the transmitting antenna. This solution solves the problem of system linearity and cost High problem, but higher requirements for photodetectors, which require photodetectors to have high response speed and high output power capability

In order to meet the requirements of photodetectors for response speed and output power, photodetectors generally use a photogenerated millimeter-wave power synthesis circuit connected by a single photodiode according to an artificial transmission line structure. At the same time, the power is limited by the cut-off frequency of the photodiode itself, and the cut-off frequency of the photodetector cannot be increased, thus limiting the response speed of the photodetector.

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