Study on the ellipsoidal reflector interception methods for quasi-optical systems

Abstract

For quasi-optical system,in order to improve the application performance of quasi-optical system on weather satellites,a new method of intercepting ellipsoidal reflectors that can effectively reduce extra energy loss in transmission and decrease the sizes of reflectors was proposed. Ellipsoidal reflectors are important optical elements for light beam transmission in quasi-optical system. The traditional method of intercepting ellipsoidal reflectors would introduce extra energy loss which deteriorates the performance of the whole system.To solve this problem,by building a Gaussian beam transmission model,traditional method of designing ellipsoidal reflectors was improved—translating ellipsoidal reflectors according to the beam waist radius. Simulations reveal that improved method performs better than traditional method—it not only reduces the maximal electrical level from- 30 d B to- 35 d B but also decreases the size of mirror by 10% to 30% which will benefit the electrical performance of quasi-optical system as a whole. All in all,improved method makes for decreasing the size and increasing signal-to-noise ratio( SNR) of the whole system,which ensures energy maintenance of weak meteorological signals during transmission process and improved method is of great significance to improve the properties of the quasi-optical system.