For Full-Text PDF, please login, if you are a member of IEICE,|
or go to Pay Per View on menu list, if you are a nonmember of IEICE.
Development of a 5.3-GHz Klystron for a Pulsed Doppler Radar
Kyosuke HAMAZU Kazuhisa HEMMI Kazutaka HAYASHI Hiroyuki HASHIGUCHI Shoichiro FUKAO
IEICE TRANSACTIONS on Communications
Publication Date: 2002/06/01
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antenna and Propagation
5.3-GHz klystron, transmitting tube, electron gun, cavity, pulsed Doppler radar,
Full Text: PDF>>
A 5.3-GHz klystron has been recently designed and fabricated. In many countries, the transmitting frequency of 5.6 GHz (5,600 to 5,650 MHz) is commonly used for C-band meteorological radars. However, 5.3 GHz is generally used in Japan. To detect low-level wind shears by a Doppler radar, it is essential to use a MOPA (Master Oscillator and Power Amplifier) that generates stable coherent microwaves. The klystron is most suitable for this purpose. However, there are no commercially available klystrons in C-band that operate at 5.3 GHz. We developed a klystron for this band, making use of a simulation technique originally devised for S- and X-bands. The klystron operates at frequencies between 5,250 and 5,350 MHz. The typical operating parameters are a peak output power of 200 kW, a pulse width of 1 µs, and an RF duty cycle of 0.002. The klystron, including the electromagnet for focusing the magnetic field, is approximately 67 cm long with a diameter of 40 cm and a weight of 162 kg. Phase modulation is suppressed below 20% of the phase change required for the minimum resolution of Doppler velocity measurement by the radar for which this klystron is employed. The klystron shows favorable performance for Doppler radars operated in major airports in Japan.