title: Characteristic analysis of aspheric quasi-optical lens antenna in millimeter-wave radiometer imaging system.
abstract: Quasi-optical imaging systems require low blurring effect and large depth of focus (DOF) to get an acceptable sharpness of the image. To reduce aberration-limited blurring, the aspheric convex plano lenses with an aperture diameter of 350 mm are designed in W-band. We analyzed theoretically and experimentally the millimeter-wave band lens characteristics, such as beam spot size, spatial resolution (SR), and DOF, via f-number. It is first used to verify the DOF through f-number in the system-level test with the developed W-band radiometer imaging system. We have confirmed that the larger f-number of quasi-optical lens leads to a larger DOF but a lower SR.
authors: School of Information and Mechatronics, Gwangju Institute of Science and Technology, Gwangju, South Korea.
authors: Won-Gyum
authors: WG
authors: Kim
authors: Nam-Won
authors: NW
authors: Moon
authors: Manoj Kumar
authors: MK
authors: Singh
authors: Hwang-Kyeom
authors: HK
authors: Kim
authors: Yong-Hoon
authors: YH
authors: Kim