jammer; jamming device
A device that disrupts radio, radar, or other signals. Common in military and security contexts.
A jammer was used to disrupt the enemy's communications.
interceptor aircraft
Obsolete term for an aircraft designed to intercept enemy planes. Now replaced by 迎撃機.
During World War II, interceptor aircraft were developed to engage enemy bombers.
Compound of 妨害 (interference) + 機 (machine/aircraft). The second sense is obsolete and has been replaced by 迎撃機.