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We developed a new method to manufacture discrete miniature cold cathodes for microwave devices by hot bonding CVD grown CNT with Ball Grid Array (BGA) Tin alloy spheres to form a small cathode. First the CNT is grown on a Si wafer with CVD method, next a BGA Tin alloy sphere is placed on top of the CNT, and a hollow metal tube is pressed on the BGA sphere, then the whole set up is heated for several...