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Powermeasuring Devices for Ultrahigh Frequencies
Directional CouplersCapacitiveloop Directional CouplerTwohole
Principles of Transmissionline Filter Design
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admittance amplitude anode antenna antiresonant approximately attenuation band width band-pass filter butterfly cable calibrated capacitance capacitor cathode center conductor characteristic impedance coaxial cavity coaxial line constant coupling cutoff frequency decreases desired detector diameter dielectric diode effect electric electronic equal equations equivalent circuit filter frequency range function gain grid hence high-frequency high-pass i-f amplifier image impedance increase insertion loss intermediate frequency klystron length local-oscillator loop low-frequency low-pass low-pass filter matched maximum measured meter method mode modulation noise figure obtained ohms operation oscillator output parasitic resonances pass band plunger preselector pulse quency r-f power reactance receiver reflex repeller voltage resistor resonant frequency rotor plates short-circuited shown in Fig shunt signal spurious responses standing-wave standing-wave ratio superheterodyne superheterodyne receiver terminals thermistor thermocouple transmission line tube tuner tuning curves tuning range usually variation wattmeter wave waveguide wavelength zero