SPACE SHUTTLE ENGINEERING AND OPERATIONS SUPPORT 1.2-DN-BO503-006 ISOLATION BETWEEN THE S-BAND QUAD ANTENNA AND THE S-BAND PAYLOAD ANTENNA ENGINEERING SYSTEMS ANALYSIS

摘要

The isolation between the Upper S-Band Quad Antenna and the S-Band Payload Antenna on the Shuttle Orbiter is calculated using a combination of plane surface and curved surface theories along with worst-case values. A minimum value of 60 dB isolation is predicted based on recent antenna pattern data, antenna loactions on the Orbiter, curvature effects, dielectric covering effects and edge effects of the Payioad Bay. The calculated value of 60 dB is significantly greater than the baselined value of 40 dB. Use of the new value will result in the design of smaller, lighter weight and less expensive filters for S-Band TDRS Transponder and the S-Band Payload Interrogator.