Advanced Microwaves Laboratory
Dr. H. Matzner, S. Levy and H. Moalem
Holon Academic Institute of Technology
Dr. Ronen Holtzman
Elisra Electronic Systems LTD
December 2004
Abstract
This Laboratory Manual describes the experiments of the advances
microwaves laboratory of the Communication Engineering Department, costructed in cooperation with Elisra microwaves department.
Contents
1 Experiment 8 - Integration: RF Stage
1.1 Objectives . . . . . . . . . . . . . . . . .
1.2 Background Theory . . . . . . . . . . . .
1.3 Prelab Students Preparation and Report
1.4 Required Equipment . . . . . . . . . . .
1.5 Experiment Procedure . . . . . . . . . .
1.6 Final Report Requirements . . . . . . . .
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1.1
Experiment 8 - Integration: RF Stage
Objectives
Upon completion of the study, the student will become familiar with the
integration of the RF stage.
1.2
Background Theory
The RF stage is a subsystem of the complete receiver. This subsystem contains the input circut with its matching part, the RF bandpass …lter for
transfering the needed bandwidth, and the low noise RF ampli…er for amply…ng the weak input signals, generally coming from an antenna. In this
experiment you have to measure S-parameters of the input circuit + RF
bandpass …lter, and the S-parameters of the input circut + RF bandpass
…lter + RF ampli…er. In addition, you have to measure the image rejection
which is the di¤erence in dB between the power of the desired signal to the
power of image signal.
1.3
Prelab Students Preparation and Report
1. Explain how you can improve the return loss of your subsystems: input
circuit + RF …lter and input circuit + RF …lter + RF ampli…er.
2. Explain how you can improve the insertion loss of your subsystems input circuit + RF …lter and how to improve the performance of the subsystem
input circuit + RF …lter + RF ampli…er.
1.4
Required Equipment
Network analyzer HP - 8714B
Type N Calibration kit HP - 85032E
50 Type N accessory kit HP - 11853A
25 standard mismatch load.
1.5
Experiment Procedure
PRINT ALL YOUR RESULTS AND ADD TO YOUR REPORT !!
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RF OUT
RF IN
open
short
Calibrate for reflection response
Figure 1: Network Analyzer for measuring S-parameters.
Make your measurements in the range 970 - 1030 MHz. Input power -30
dBm.
1. Measure S-parameters (by using the Network Analyzer) of the subsystem: RF bandpass …lter + RF low noise ampli…er.
2. Connect two sources with frequencies 900 MHz and 1000 MHz to the
subsystem and check image rejection at 800 MHz (by using the Spectrum
analyzer).
1.6
Final Report Requirements
Please perform the following tasks:
1. Describe and explain each graph of your measurement results. All
your printed patterns have to be included in your …nal report.
Compare the gain of the RF LNA alone (known from previous experiment) to the gain of the subsystem: Rf …lter + RF LNA
2. Describe how you can improve your subsystems prefomance, and design
improved components needed.
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Figure 2: RF stage.
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