Development Of A Kind Of Ku Band Receiver

The current worldwide radar system has been widely used in land, sea, air and earth from outer space. Radar technology and electronic warfare technology are advancing rapidly, and radar systems and their working environment have become increasingly complex, requiring radars to have strong anti-interference ability. Therefore, as a key part of the radar, receiver design requirements are raised even higher and higher.The design of radar receiver needs to consider not only the signal to be detected, but also a variety of noise and interference detection occurs during the extraction. The performance of the receiver front-end has significant impact on the radar system. With the development of microwave technology, the level of components and manufacturing processes has a great leap forward. The development improves the integration of the receiver, in particular reduces the volume of the receiver front-end. While the receiver front-end compressed into a smaller volume, radar systems conform to the trend of miniaturization.The article described several radar receiver operating modes, finally used the design of superheterodyne receivers mode. The superheterodyne receiver consists mainly of the receiver front-end, the frequency source and the IF amplifier circuit. The article analyzed the principle of superheterodyne receivers, elaborated the limiter, the low noise amplifier, the filter, the mixer, the frequency source, introduced the principle and functions of the receiver, and proposed a kind of design implementation of simulation. While the circuit used in the IF part of is relatively simple, I do not described in detail.In front-end of the receiver, the limiter is in the most forward position, protecting low-noise amplifier not to be burned when the large signal arrivals. The low-noise amplifier determines the key indicator of noise figure. The MEMS filter is set up after the low-noise amplifier, and plays a role in suppressing clutter. The RF signal of 15.5 ± 0.5GHz becomes 2.5 ± 0.5GHz by the first mixer, and the frequency becomes 0.15 GHz from 2.5 ± 0.5GHz signal by the second mixer, now we get IF signal. The frequency source has two-way RF output respectively, as LO1 and LO2, the frequency of LO1 is 13 GHz, the frequency of LO2 is 2.35 ± 0.5GHz. After each chapter I list the test results of the key component, and compare the expected targets and explanation.The article realized a superheterodyne radar receiver, and the receiver achieved technical indicators, not only had high sensitivity, low noise figure, good signal selectivity and stable performance characteristics, but also broke the previous modularization design, and implemented the receiver of high integration, small size, accorded with the miniaturization trend of radar systems.