Shielding Effectiveness of a Spacecraft Faraday Cage With Pin 1 Connections
Estimates are made of the shielding effectiveness (SE) of a satellite Faraday cage with Pin 1 connections. Degradation of the SE by space radiation and solar-thermal cycling is described. The impact of multilayer insulation on the SE is assessed.
Shielding effectiveness of satellite faraday cages with EMI taped seams and closeouts
Estimates are made of the shielding effectiveness of spacecraft Faraday cages that use composite walls, hand holes for pipes and cables, EMI taped seams and closeouts, and dual thermal-RF shields, in place of older designs with bolted metal sheets for all RF shielding and EMI connectors for all cables that connect to the cage. Degradation of EMI tape by space radiation and 1000s of solar-thermal cycles is described.
Ceramic microwave antennas for mobile applications
Due to their medium to high permittivity values, ceramic microwave materials are attractive as building blocks for miniaturised antenna solutions. Further advantages are low dielectric losses and an excellent temperature stability of standard ceramic materials. Yet, the permittivity of the ceramic material also has a strong influence on the radiation efficiency and bandwidth of the antenna. This implies that in the design process a suitable compromise has to be found between the degree of miniaturisation on the one hand and the antenna efficiency and bandwidth on the other. We describe two approaches towards efficient miniaturised ceramic microwave antennas: the dielectric resonator antenna (DRA) with partial metallisation and the shorting post patch antenna. We focus on design steps taken to ensure both a high degree of miniaturisation and high values of the radiation efficiency, the choice of the ceramic material and the experimental performance of the antennas.