Waveguide Components

Scientific Microwave manufactures two type of power supplies for the microwave benches in X-Band. Klystron Power Supply For the klystron based microwave bench. Klystron power supply generates required beam and repeller voltage for the X-Band klystron tube like 2K25. It is very stable and contains the short circuit protection circuit. Also it has amplitude and frequency modulation circuits for the generation of 1 KHz square wave and the saw tooth wave. Specifications Model SKPS-610 Beam Supply:

• Voltage Range: 200-450 V continuously Variable
• Current: 50mA Max
• Regulation: Better than 0.5% for 10% variation in the mains supply voltage
• Ripple: Less than 5 mV rms
• Repler supply Voltage Range: 10V to 270 V DC Continuously variable with respect to klystron cathode
• Regulation: 0.25% for 10% variation in the mains supply voltage
• Heater Supply: 6.3 V DC (Regulated)

Modulation:

• Square Wave: Max. Amplitude: + 110 V peak to peak Freq.: 500 Hz-2000Hz Amplitude and frequency continuously variable
• Sawtooth: Amplitude: -60 V max. peak to peak Freq.: 50 Hz-150 Hz Amplitude and frequency continuously variable
• Operating Voltage: 230V 10%, 50 Hz, A.C.

Gunn Power Supply: For Gunn based bench. It is regulated power supply to operate the gunn oscillator. It also contains square wave generator to provide 1KHz frequency to the pin modulator for amplitude modulation. Specifications:

Voltage Range: 0-12V continuously variable

Current: 1A max

Regulation: 0.2 % for 10 % variation in the mains supply voltage

Ripple: 1mVrms

Modulation frequency: 1kHz +/- 10% (900-1100kHz)

Output Connector: BNC (F) for Gunn Oscillator and TNC (F) for Pin Modulator

It is a waveguide of suitable length having octal base on the broad wall of the waveguide for mounting the klystron tube. It consists of movable short at one end of the waveguide to direct the microwave energy generated by the klystron tube. A small hole located exactly at the center of the broad wall of the waveguide is used to put the coupling pin of the tube as the electric field vector of EM energy is maximum at the center only. The maximum power transfer can be achieved by tuning of the movable plunger.

Model	Band	Freq. Range (GHz)	Waveguide
SKM-139	S	2.60-3.95	2.60-3.95
CKM-139	C	3.95-5.85	WR-229
JKM-139	J	5.85-8.20	WR-137
XKM-139	X	8.20-12.40	WR-90
KUKM-139	Ku	12.40-18.00	WR-62

A waveguide is a hollow metallic tube of any cross section through which the transmission of the electromagnetic waves takes place by the successive reflections from the inner walls of the tube. The cross section of the waveguide is related to the frequency of the waves and is suitable for the transmission of signal in microwave frequency range. The rectangular waveguide is by far more important from a practical point of view, mainly because of the simplicity of the propagation phenomena involved. Specification

Waveguide	Band	Freq. Range (GHz)	Inner Cross Section (mm)	Outer Cross Section (mm)
WR-284	S	2.60-3.95	72.14 x 34.04	76.20 x 38.01
WR-229	C	3.95-5.85	58.17 x 29.083	61.42 x 32.33
WR-137	J	5.85-8.20	34.85 x 15.799	38.10 x 19.05
WR-90	X	8.20-12.40	22.860 x 10.160	25.40 x 12.70
WR-62	Ku	12.40-18.00	15.799 x 7.899	17.83 x 9.93
WR-42	K	18.00-26.50	10.688 x 4.318	12.70 x 6.35
WR-28	Ka	26.4-40.1	7.112 x 3.556	9.14 x 5.59