Yarmouk University
Hijjawi Faculty of Engineering and Technology
Department of Communication Engineering
Microwave Systems Lab (CME447a)
Part 2: Microwave Antennas
Experiment 1:
Wavelength and frequency Measurements
Objectives:
Upon completion of the laboratory study and experimentation, the student will be able to:
[1].
[2].
[3].
[4].
Background Discussion
Part 2
Microwave Antennas
Page 1
Yarmouk University
Hijjawi Faculty of Engineering and Technology
Department of Communication Engineering
Material Required
Experimental Procedures
[1]. Arrange the microwave components in the following order. Start by aligning the adjustable base at
the apex of the plotting chart. Move the stand with the transmitter module to the left of the plotting
chart and align the front of the horn with 70 cm (0 dB) mark.
Note: Make sure all components are aligned properly before taking any measurements.
[2]. Record each peak on the chart provide below.
Note: The distance between each peak is equivalent to one-half of a wavelength.
Peak
1
2
3
4
5
Part 2
Microwave Antennas
Scale Reading
mm
mm
mm
mm
mm
Page 2
Yarmouk University
Hijjawi Faculty of Engineering and Technology
Department of Communication Engineering
[3]. Repeat the measurements using null points.
Null
Scale reading
1
2
3
4
5
mm
mm
mm
mm
mm
[4]. records your average reading for half a wavelength.
Average
mm
[5].From the average value, compute the frequency of the transmitting module:
Where:
Frequency in GHz.
Velocity in space.
=wavelength in space (in meters)
Frequency
Part 2
Microwave Antennas
GHz
Page 3
Yarmouk University
Hijjawi Faculty of Engineering and Technology
Department of Communication Engineering
[6].Rearrange the component by placing the transmitter at the apex, the polarization plane (filter)near
the center of the plotting chart, and the detector waveguide with horn on the center line at
center of stand on 0 dB.
with the
With the polarization plane between the transmitter and the receiver set the plane so that the grid lines
are parallel to the table when this done turn on the field strength meter and set it at full scale .Record
your observation as you rotate the polarization plane from the horizontal position to vertical position.
Vertical
Horizontal
Conclusion:
Part 2
Microwave Antennas
Page 4
Yarmouk University
Hijjawi Faculty of Engineering and Technology
Department of Communication Engineering
Experiment 2:
Calculated Gain measurements
Objectives:
Upon completion of the laboratory study and experimentation, the student will be able to:
[1].
[2].
[3].
[4].
Background and Discussion
Part 2
Microwave Antennas
Page 5
Yarmouk University
Hijjawi Faculty of Engineering and Technology
Department of Communication Engineering
Material Required :
Experimental Procedures
[1]. Attach 15 dB horn to the detector waveguide and support stand .attach the BNC of the meter to the
BNC of the detector and attach 15 dB horn to the transmitter module and support stand.
[2]. Measure the “a” and “b” dimension of the 10 dB and 15 dB horns
10 dB Horn
a
b
15 dB horn
cm
cm
a
b
cm
cm
[3].Assume that the transmitter is operating at a frequency of 10.5 GHz also assume that the
propagation factor of the waveguide is 0.8

Determine the wavelength in the waveguide
____________ cm

Gain of small antenna horn
____________ dB

Gain of larger antenna horn.
____________ dB
Part 2
Microwave Antennas
Page 6
Yarmouk University
Hijjawi Faculty of Engineering and Technology
Department of Communication Engineering
[4].Compute the area of the aperture for each horn and from the gain equation determine the gain of
each horn
10 dB horn=_________________dB
10 dB horn=_________________dB
Conclusion:
Experiment 3:
Radiated Horn Antenna Gain Measurements
Objectives:
Upon completion of the laboratory study and experimentation, the student will be able to:
[1].
[2].
[3].
Background and Discussion
Part 2
Microwave Antennas
Page 7
Yarmouk University
Hijjawi Faculty of Engineering and Technology
Department of Communication Engineering
Material Required :
Experimental Procedures
[1].Align the detector and stand so that the front of the 15 dB horn lines up to 20 cm and the center
hairline is on 0 degrees. Insert the transmitter module into the base stand by clamping onto the one inch
neck. Using the pointer provided opposite the centimeter scale, align it with the position marked no
horn.
[2].record the distance between the waveguide of the transmitting module and the receiving horn.
Distance =__________________cm.
[3].attach the 10 dB horn antenna to the transmitter module and clamp it into the adjustable stand
.Record the distance between the apex and the front edge of the receiver horn.
Distance =__________________cm.
[4]. How many centimeters away from the apex is the front edge of the receiving horn?
Part 2
Microwave Antennas
Page 8
Yarmouk University
Hijjawi Faculty of Engineering and Technology
Department of Communication Engineering
Distance =__________________cm.
[5].Compute and record the measured gain of both 10 dB and the 15 dB horn.
Gain of 10 dB
Gain of 15 dB
Conclusion:
Part 2
Microwave Antennas
Page 9