SPIRAL DELAY DEVICE WITH ABNORMAL DISPERSION Russian patent published in 1996 - IPC

FIELD: microwave devices. SUBSTANCE: device has spiral which is mounted in metal screen by means of dielectric supports on metal flanges. Ratio of sizes of said supports and flanges conform to following equations , where d and d₁ are radial sizes of flanges and supports respectively, n is number of supports, R is outer radius of spiral, R₁ is radius of circumference drawn over surfaces of flanges that are directed to spiral. EFFECT: increased range of amplified frequencies. 2 cl, 6 dwg