Research on high reliability bonding technology for space-borne microwave dielectric resonator
Dielectric resonator is the core component of the space-borne microwave dielectric multiplexer and is a key component of the payload of communications satellite.Dielectric resonator is generally made of cylindrical ceramic media with low loss,high dielectric constant,and stability to temperature changes.Usually,adhesive is used to bond onto specialized screws and adjust the position in the multiplexer chamber through quartz tubes or columns.In response to the key difficulties in the bonding technology of space-borne microwave dielectric ceramic resonator,a dedicated fixture was designed to control the entire process of adhesive selection,bonding,and experimental verification,ensuring process factors such as adhesive coaxiality,bonding pressure,and adhesive dosage.Simultaneously ensuring the reliability of bonding and the high Q value of the dielectric resonator,thermal,mechanical and radiation verifications were carried out according to the experimental level of space-borne products,achieving high reliability bonding of microwave dielectric ceramic materials and obtaining high-performance space-borne microwave passive products.The research results showed that the bonding process of space-borne microwave dielectric resonator was determined by the characteristics of the adhesive,the roughness of the bonding surface,and the control process of the adhesive usage.A resonator that met the requirements for aerospace use could only be qualified for aerospace flight after passing aerospace level testing verification under specific process parameters.
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