## A Pulse Compression Filter Employing a Microwave Helix |

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18 inches angular frequency aquadag band of frequencies bandwidth center frequency COMPRESSED AND UNCOMPRESSED compressed pulse width compression filter coupling helix db points delay vs frequency desired dispersion dielectric dispersion curve dispersive helix expanded view free space frequency band frequency characteristic frequency curve function of frequency Gaussian glass group velocity helical couplers HELIX AND COUPLER helix length constant high frequency inches of helix input pulse width insertion loss Karp circuit length of helix linear low frequencies lower trace Mc band measured microwave frequencies nanoseconds per division nonsweeping signals nsec optimum compression oscilloscope outer helix output pulse width passband phase velocity PHOTOGRAPH SHOWING EFFECT propagation constant PULSE COMPRESSION PULSES WHEN BANDPASS quency rate of 20 ratio of compressed shorted stub shown in Fig Signal sweep rate slotted line stripline bandpass filter structure sweeping signal theoretical transfer function traveling wave tube uncompressed and compressed uncompressed pulse amplitude velocity vs frequency VSWR