Microwave Test Bench Series

Nvis 9000 Series

The Nvis 9000 series of Microwave Test Benches are precision made microwave systems, which use standard type rectangular wave-guide
components to illustrate the essential elements of this field for study.
The equipment consist of :
?
A selection of wave-guide components
?
The Power Supply for the microwave source
?
A detector
?
A meter, which monitors the detector output
?
A Demo Video CD
?
Audio Communication
?
Provided with PC to PC communication in Gunn based Benches
?
Wall Chart
These Training Benches are completely self-contained & provide the means to allow students to carry out practical work at extremely low cost. A
comprehensive manual containing extensive microwave theory and a progressive series of assignments is supplied with the platform.

Wall Chart

Nvis 9000 Series

Microwave Test Bench Series

Microwave Test Bench Nvis 9000

(Klystron Based)
Experiments that can be performed

Study of the characteristics of klystron tube and to determine its

electronic tuning range

To determine the frequency & wavelength in a rectangular waveguide

working on TE10 mode

To determine the standing wave ratio and reflection coefficient

To measure an unknown impedance with Smith Chart

To study the square law behaviour of a microwave crystal detector

To study the voice communication by using microwave test bench

To study the variable attenuator

Microwave Test Bench Nvis 9001

(Gunn Based)
Experiments that can be performed

To study the V-I characteristics of Gunn Diode

To study the voice communication by using microwave test bench

To study the following characteristics of Gunn Diode

- Output power and frequency as a function of voltage

- Square wave modulation through Pin Diode

To determine the frequency & wavelength in a rectangular waveguide

working on TE10 mode

To determine the standing wave ratio and reflection coefficient

To measure an unknown impedance with Smith Chart

To study the square law behaviors of a microwave crystal detector

To study the PC to PC data communication

To study the variable attenuator

Microwave Test Bench Nvis 9002

(Klystron/Gunn Based)
Experiments that can be performed

Study of the characteristics of Klystron tube and to determine its

electronic tuning range

To determine the frequency in a rectangular waveguide working on TE10

mode

To measure the polar pattern and the gain of following antennas

- Standard Gain Horn - Pick up horn

- Slotted Broad Wall - Slotted Narrow Wall
- Dielectric Antenna - E-plane Sectorial Horn
- H-Plane Sectorial Horn - Pyramidal Horn - Parabolic Dish

To study the square law behaviour of a microwave crystal detector.

To study the voice communication by using microwave test Bench.

To study the variable attenuator

Microwave Test Bench Series

Microwave Test Bench Nvis 9002A
(Klystron Based/Gunn based)

Nvis 9000 Series

Radiation pattern of Pickup Horn Antenna

To study the variable attenuator

All the experiments of Nvis 9002 can be performed in this model using
PC interfaced Motorized unit.

Features
?
Microcontroller Based High Precision DC Stepper Motor
Automatic Zero Point setting
?
Built-in DC Power Supply
?
Instant Plotting of radiation Pattern
Radiation pattern of Horn Antenna
?
Resolution : 1
?
RS232 data link to PC
?
Software running under Windows 98
?
PC Based Motorized Unit

Technical Specifications
Microwave Input

: From Gunn / Klystron source

Detector

: With BNC output

Antenna Rotation

: 360 (1 Resolution)

Power Supply

: 230V 10%, 50Hz

Power Consumption

: 22V A (approximate)

Accessories :
Mains Cord
BNC-BNC Cable
RS-232 Cable
Radiation Pattern Plotting Software

Application software window

Nvis 9000 Series

Microwave Test Bench Series

Microwave Test Bench Nvis 9003
(Gunn Based)
Experiments that can be performed

To study the V-I characteristics of Gunn Diode

To study the following characteristics of Gunn Diode

- Output power and frequency as a function of voltage

- Square wave modulation through Pin Diode

To determine the frequency & wavelength in a rectangular

waveguide working on TE10 mode

To determine the standing wave ratio and reflection coefficient

To study the square law behaviour of a microwave crystal detector

To study the resonant cavity

Measurements of Dielectric constant.(Solid and liquid)

- Low-loss solid dielectrics- Liquid dielectrics or solutions

To study the phase shift measurements by using phase shifter

To study the variable attenuator

Technology Learning Software Microwave

Microwave Fundamentals
Microwave Fundamentals software is very powerful tool to
understand core concept of Microwave Technology, throw high
quality Simulation, rich theoretical content and attractive animated
diagrams.
It covers following topics.
Electromagnetic Wave
Basics of Electromagnetic waves
Wave Guide
Rectangular Wave Guide
TE Modes, TM Modes, Field Patterns, Power Flow.

Microwave Test Bench Nvis 9004

(Klystron/Gunn Based)
Experiments that can be performed

Study of the characteristics of klystron tube and to determine its

electronic tuning range

To determine the frequency & wavelength in a rectangular

waveguide working on TE10 mode

To determine the standing wave ratio and reflection coefficient

To measure an unknown impedance with Smith Chart

To study the square law behaviour of a microwave crystal detector

Study of attenuators (fixed and variable type)

Study of Tee
- E Plane Tee - H Plane Tee - Magic Tee

Study the function of multihole directional coupler by measuring the

following parameters.
- Main line & Auxiliary line VSWR
- Coupling factor and directivity and Isolation

Study of circulators/Isolator

Circular Wave Guide

TE Modes, TM Modes, Field Patterns, Power Flow.

Microwave Components
Microwave Cavities, Microwave Hybrid Circuits
Directional Coupler, Circulator and Isolator

Microwave Test Bench Nvis 9005

(Gunn Based)
Experiments that can be performed

To determine the frequency & wavelength in a rectangular

waveguide working on TE10 mode

To study the following characteristics of Gunn Diode

- Output power and frequency as a function of Bias Voltage

- Square wave modulation through PIN diode

To determine the Standing Wave-Ratio and Reflection Coefficient

To measure an unknown Impedance with Smith chart

To study V-I characteristics of Gunn Diode

To measure the gain of a waveguide horn antenna

Study the function of multi-hole directional coupler by measuring

the following parameters :
- To Measure main-line and auxiliary-line VSWR
- To Measure the coupling factor and directivity and isolation.

Study of Magic Tee

To study the square law behaviour of a microwave crystal detector

Microwave Tubes
Velocity Modulation, Klystron, Magnetron, Traveling Wave Tube

Microwave Active Components

Gunn Diode, IMPATT Diode, TRAPATT Diode, Tunnel Diode

Nvis 9000 Series

Microwave Test Bench Series

List of Benchwise Components
Nvis-249

Nvis-227

Nvis-225

Nvis-247

Nvis-250

Nvis-238

Nvis-229

Nvis-240

Nvis-209

Nvis-202

Nvis-243

Nvis-235

Nvis-248

Nvis-246

Nvis-232

Nvis-214

Nvis-244

Nvis-220

Nvis-221

Nvis-241

Nvis-219

Nvis-242

Nvis-217

Nvis-207

Nvis-218
Nvis-224

Nvis-236
Nvis-102

Nvis-205

Nvis-239

Nvis-255

Nvis-230

Nvis-201

Nvis-231

Nvis-101

Nvis-208

Nvis-233

Nvis-206

Nvis-245

Nvis-103

Nvis-222

Nvis-213

Nvis-211

Nvis-216

Nvis-257

Nvis-234

Nvis-204

Nvis-215

Nvis-203
Nvis-237
Nvis-258
Nvis-223
Nvis-212
Nvis-210
Nvis-228
Nvis-226

Microwave Component Technical Specification

Nvis 201 Gunn Oscillator

Nvis 216 Waveguide Twist

Gunn Oscillators are used to generate the microwave signal and

its Micrometer is used to tune the output frequency of Gunn
oscillator.

Waveguide Twist is used to change the plane of Polarization of

a wave Guide transmission line . Twist is made from a section
of waveguide which has been precisely twisted. 900 twist is a
standard available model.

Band

Frequency(GHz)

8.2-12.4

Waveguide

WR-90

Flange

UG-39/U

Pushing Factor

--

Bias Voltage max.

10V

Normal Power Output

10mW

Temp. Coefficient

--

Output Connection

BNC(F)

Frequency Adjustment

By Micrometer

Band

Frequency(GHz)

8.2-12.4

Waveguide

WR-90

Flange

UG-39/U

VSWR

1.09 At 10.5GHz

Return Loss

-26.9dB At 10.5GHz

Nvis 9000 Series

Microwave Test Bench Series

Nvis 212 Matched Termination
Matched terminations are used to terminate the waveguide
transmission line operating at low average power. The loads are
carefully designed to absorb all the applied power and VSWR of
matched termination is low. These are used in the measurement
of reflection coefficient and where the matched load is required.

Nvis 210 Movable Shorts /

Nvis 235 Precision Movable Short
Movable shorts are used to obtain a phase reference in the
calibration of various experimental setups .These are also
used to vary the effective plane of reflection and therefore the
phase of reflected wave. Movable shorts are used to measure
the impedance of a device. Movable shorts are of two types
one has no provision to record position of short in the
waveguide and other type of movable short is precision
movable short in which position of short can be accurately
recorded from micrometer.

Band
Frequency(GHz)
Waveguide
Flange
VSWR
Return Loss
Av. Power
Type

X
8.2-12.4
WR-90
UG-39/U
1.03 At 10.5GHz
-33dB At 10.5GHz
2W
Fixed

Band
Frequency(GHz)
Waveguide
Flange
Reflection
Coefficient

X
8.2-12.4
WR-90
UG-39/U
0.98

Nvis 238 Phase Shifter

Many applications require phase shift to be introduced between
two given position in a waveguide system. It consists of a
dielectric slab or vane specially shaped to minimize reflection
effect. Phase shifter are used to change the effective electrical
length of transmission line without changing its physical length.
They are particularly useful in microwave bridge circuit where
the phase and amplitude must be adjusted independently.

Band
Frequency(GHz)
Waveguide
Flange
VSWR
Return Loss
Calibration
Accuracy

X
8.2-12.4
WR-90
UG-39/U
1.15 At 10.5GHz
-23.1 At 10.5GHz
2.5

Nvis 208 Tunable Probe

Tunable probes are very useful devices to measure the SWR
and Impedances. Tunable probe is consists of a crystal
detector and a small wire antenna in coaxial housing. Its depth
of penetration into the slotted section is variable.

Band
Frequency(GHz)
Detector
Output
connector
Type

X
8.2-12.4
IN23
BNC(F)
Tunable

Nvis 9000 Series

Microwave Test Bench Series

Nvis 220 Slide Screw Tuners

Nvis 203 Klystron Mount

Slide Screw Tuner is a very useful component in a microwave

laboratory. It is mainly used for Impedance measurement. Its
tuner can be adjusted for low and high impedance position.

Klystron mounts are used to transmit microwave power from

reflex klystron tube to rectangular waveguide. Klystron mounts
are designed by a section of waveguide, one end of waveguide
is fitted with a movable short plunger. A small hole on the broad
wall of waveguide is provided through which coupling pin of
reflex klystron tube enters into the waveguide. By moving
plunger (matching the impedance of klystron tube and
waveguide) maximum output can be achieved.

Band

Frequency(GHz)

8.2-12.4

Band

Waveguide

WR-90

Frequency(GHz)

8.2-12.4

Flange

UG-39/U

Waveguide

WR-90

Max. VSWR

20 : 1.02

Flange

UG-39/U

Nvis 202 Pin Modulator

Nvis 205 Direct Reading Frequency Meter

Pin diode modulators are used to provide amplitude or pulse

modulation in wide range of microwave to study many
applications. These modulators uses PIN diode which is mounted
across the waveguide line with RF isolated DC bias lead passing
to an external TNC(F)

Direct Reading frequency meters are used to measure the

microwave frequency accurately. There long scale length and
numbered calibration marks provide high resolution which is
particularly useful when measuring frequency difference of
small frequency changes.

Band

Band

Frequency Range(GHz)

8.2-12.4

Frequency(GHz)

8.2-12.4

Waveguide

WR-90

Waveguide

WR-90

Flange

UG-39/U

Flange

UG-39/U

Calibration Accuracy

2%

Bias Voltage

0-12 Vpp

Calibration Increment

5 MHz

Output Connector

TNC(F)

Max. VSWR

1.28 At 10.5GHz

Return Loss

-18.2 At 10.5GHz

Nvis 9000 Series

Microwave Test Bench Series

Nvis 205A Digital DRF Meter (Optional)

Nvis 206 Variable Attenuator

Direct Reading frequency meters are used to measure the

microwave frequency accurately. Digital Display LCD provides
high resolution which is particularly useful while measuring
frequency difference of small frequency changes.

10 dB / 20 dB

Band

Band

Frequency Range(GHz)

8.2-12.4

Frequency Range(GHz)

8.2-12.4

Waveguide

WR-90

Waveguide

WR-90

Flange

UG-39/U

Flange

UG-39/U

VSWR Max.

1.25 At 10.5GHz

Calibration Accuracy

2%

Av. Power

2W

Calibration Increment

5MHz

Return Loss

-19.23 At 10.5GHz

Max. VSWR

1.28 At 10.5GHz

Return Loss

-18.2 At 10.5GHz

Nvis 225 Wave Guide Adaptor

Adaptors transform waveguide impedance to coaxial
impedance. Adopters consist of a short section of waveguide
with a probe transition mounted on broad wall. Power can be
transmitted in either direction. Each adaptor covers the 50% of
the waveguide.

Nvis 217-219 Fixed Attenuators

Attenuators are required to adjust power or attenuate the
power flowing in waveguide.There are two type of attenuators
fixed and variable. Fixed attenuators available in various range
like 3dB,6dB,10dB etc. These attenuators are calibrated at
center frequency of respective frequency band. By Variable
attenuators power can be adjusted for different level.

Band

Band

Frequency Range(GHz)

8.2-12.4

Waveguide

WR-90

Waveguide

WR-90

Flange

UG-39/U

Flange

UG-39/U

VSWR Max.

1.06 At 10.5GHz

Connector

N Type (F)

Av. Power

2W

VSWR Max.

1.12 At 10.5GHz

Accuracy

0.5 dB

Return Loss

-24.5 At 10.5GHz

Return Loss

-31 dB At 10.5GHz

Frequency Range(GHz)

8.2-12.4

Nvis 9000 Series

Microwave Test Bench Series

Nvis 232 E-Plane Bends

Nvis 229 Cross Directional Coupler

In measurements it is often necessary to bend a waveguide by

some angle. Waveguide bends in E and H plane of 90 is
normally available. Waveguide bends designed by a section of
rectangular waveguide and flange.

Cross Directional Coupler consists of two waveguide sectional

joint at (90) with the coupling element mounted into the
common broad wall.

Band

Frequency Range(GHz)

8.2-12.4

Waveguide

WR-90

Flange

UG-39/U

8.2-12.4

Coupling (dB)

20 dB

Waveguide

WR-90

Directivity (Min)

25 dB

Flange

UG-39/U

Coupling Accuracy

1 dB

VSWR Max.

1.25 At 10.5GHz

Return Loss

-25.7 dB At 10.5GHz

Band
Frequency Range(GHz)

Nvis 226, Nvis 253, Nvis 228

Multihole Directional Coupler
Directional coupler are designed to measure incident and
reflected power values and also provide a signal path to a
receiver or perform other desirable operation. In its most
common form, the directional coupler is a four fort waveguide
junction consisting of a primary main waveguide and a
secondary auxiliary waveguide. These are available in 3, 6,10,
20, 40 dB coupling.

Nvis 233 H Plane Bends

For 10 dB

Band

Frequency Range(GHz)

8.2-12.4

Waveguide

WR-90

8.2-12.4

Flange

UG-39/U

Waveguide

WR-90

VSWR Max.

1.06 At 10.5GHz

Flange

UG-39/U

Return Loss

-31 dB At 10.5GHz

VSWR Max.

1.06 At 10.5GHz

Coupling (dB)

10.1 0.6

Return Loss

-31 dB At 10.5GHz

Directivity (Min)

46.0 dB (3%)

Band
Frequency Range(GHz)

Nvis 9000 Series

Microwave Test Bench Series

Nvis 223 Magic Tee /
Nvis 248 E-H Tee

Nvis 236 Solid Dielectrical Cell

These are used to measure dielectric constant of any solid
material these consists of a cavity for keeping the sample and
micrometer to read the position of sample.
Band

Frequency Range (GHz)

8.2-12.4

Waveguide

WR-90

Band

Flange

UG-39/U

Frequency Range

8.2-12.4

Max. Length of cell

100 mm

Waveguide

WR-90

Plunger Movement

25 mm

Flange

UG-39/U

Nvis 222 H Plane Tee

Nvis 237 Liquid Dielectrical Cell

Band

Frequency Range(GHz)

8.2-12.4

Waveguide

WR-90

Flange

UG-39/U

Max. Length of cell

200 mm

Plunger Movement

65 mm

TEE
Tees are used to combine power from two input or divided the
microwave power from one input to two output lines. Tee is an
intersection of three waveguides in the form of alphabet T.

Nvis 221 E Plane Tee

Band

Frequency Range(GHz)

8.2-12.4

Waveguide

WR-90

Flange

UG-39/U

Max. Length of cell

200 mm

Plunger Movement

65 mm

Band

Frequency Range(GHz)

8.2-12.4

Waveguide

WR-90

Flange

UG-39/U

Nvis 209 Wave Guide Detector Mount

The crystal detector can be used for the detection of microwave
signal. At low level of microwave power, the response of each
detector approximates to square law characteristics and may
be used with a high gain selective amplifier having a square law
meter calibration.

Band

Frequency Range(GHz)

8.2-12.4

Waveguide

WR-90

Flange

UG-39/U

Detector

IN21(any
equivalent)

Output Connector

BNC (F)

Nvis 9000 Series

Microwave Test Bench Series

Nvis 204 Ferrite Isolator,
Nvis 230 T Circulator, Nvis 231 Y Circulator
The ferrites isolators and circulators are matched 2 port and 3 port
devices respectively, which offer low insertion loss and high
isolation over 1GHz band width. An isolator is a 2 port device which
allows signals from port 1 to port 2 & provides maximum
attenuation for transmission from port 2 to 1. A circulator is a
three port device which has a peculiar property of coupling power
to the adjacent port clockwise

Band
Frequency Range
Waveguide
Flange
Max. VSWR
Min. Insertion Loss
Min. Isolation
Return Loss

X
8.2-12.4
WR-90
UG-39/U
1.15
0.46 dB
20 dB
22.4

Nvis 239-247 Waveguide Antennas

There are several types of microwave antennas like standard Gain,
Pyramidial horn, Pick up horn, Dielectric antenna, Parabolic dish
antenna etc. these are used to radiate microwave energy in the air
and to receive the energy from air.

Frequency
Range(GHz)
8.2-12.4 GHz
8.2-2.4 GHz
8.2-12.4 GHz
8.2-12.4 GHz
8.2-12.4GHz
8.2-12.4GHz
8.2-12.4GHz

Flange
Designation
UG-39/U
UG-39/U
UG-39/U
UG-39/U
UG-39/U
UG-39/U
UG-39/U

Waveguide
Antennas
Gain
Type
Type
WR-90
Pyramidal
16
WR-90
Pick Up
10
WR-90
E-Section
15
WR-90
H-Section
15
WR-90
Parabolic dish
-WR-90
Standard Gain
-WR-90 Dielectric Antenna --

Nvis 255 Micrometer Type Frequency Meter

Micrometer type frequency meters are consists of a microwave
cavity with plunger and a section of waveguide. It consists of a
micrometer to measure its position for measuring frequency.

Band

Frequency Range

8.2-12.4

Waveguide

WR-90

Flange

UG-39/U

Max. VSWR

1.15

Calibration Accuracy

2%

Calibration Increment

10 MHz

Nvis 207 Slotted Section

Slotted section is used to measure various measuring
parameter in microwave. for example to determine VSWR,
phase and impedances. These consists of a slot in center of
waveguide in which we can connect a probe and probe can be
moved in slot and position of probe can be measured by its
Varnier scale. The travel of probe carriage is more than three
times of half wavelength.

Band

Frequency Range

8.2-12.4

Waveguide

WR-90

Flange

UG-39/U

Residual VSWR

1.01

Slope (dB)

(0.2dB)

An ISO 9001: 2008 company

Designed & Manufactured in India by :

Nvis Technologies Pvt. Ltd.

141-A, Electronic Complex, Pardesipura, Indore - 452 010 India
Tel.: 91-731-4211500, E-mail: info@nvistech.com, Website : www.NvisTech.com