A microwave test bench is an assembly of various microwave components, held together by Nuts & Bolts. It consists of a microwave source (Oscillator) at one end. The waves generated are led down by a wave guide through various components, so that the student can observe the propagation of waves, and their interaction and/or processing by various components.
1.Isolator :
This bench consists of the following components :
ferrite based.Made out of circulator by terminating
one of its three ports into matched loads.
Frequency : 1MHz wide within X-Band
Isolation : 20dB Typical
2. Variable Attenuator :
3.Slotted line with Probe Carriage :
It is the basic microwave equipment for study of VSWR Attenuation,Phase,Impedance,etc.It consists of a waveguide section in which a small longitudinal cut has been made and a carriage is affixed, which can be moved along the cut by a vernier arrangement. When a tunable detector probe is affixed on the carriage ,its tip projects into the waveguide and picks up energy from the guide.
Frequency Range : 8.2 to12.4 GHz
Residual VSWR : 1.01
Total Vernier Travel : 15 Cms typical
4. Tunable Probe :
Tunable probe is designed to be used with
slotted line section.These are meant for
exploring the energy of Electric Field in a
suitably fabricated section of waveguide.
The depth of penetration into a waveguide
section is adjustable by the knob of the
probe.The tip picks up the RF power
from the line,this power is rectified by
crystal detctor which is fed to the
VSWR meter or indicating instruments.
Frequency Range : 8.2 to 12.4 GHz
Output Connector : BNC
5. Micrometer Type Frequency Meter :
It uses a high Q TE11 TUNED CAVITY and
a precision piston with the drive
mechanism coupled to a micrometer.
The meter is of absorption type and
designed to give wideband working
without ambiguity.
Frequency Ran 8.2 to 12.4 GHz,X Band
VSWR Better than 1.02
Accuracy + 2MHz
Calibration chart Provided
6.Moveable short
It consists of a waveguide section, flanged
at one end and terminated with a
moveable shorting plunger on the other
end, driven by a precision micrometer
with L.C.of 0.01mm.
Frequency Rang: 8.2 to 12.4GHz
Micrometer : 15 mm
Micrometer LC : 0.01 mm.
7. Matched Terminations :
It is a nonreflective termination based on tapered flap. These are useful for VSWR measurements of various waveguide components.These are also employed as aprecise reference loads with Tee junctions,directional couplers etc.
Frequency Range: 8.2 to 12.4 GHz
VSWR Better than 1.02
Average Power : 2 watts
Besides these components,waveguide
Stands ,assorted cables and manual
etc. is provided.
