41482 - Microwave Laboratory L-A

Learning outcomes

Aim of the course is to give to the student a first applicative approach to the study of one-port and two-port devices operating at microwave frequencies. Thanks to the activities that will be proposed, the student will be able to perform the CAD design of impedance matching networks and of single stage microwave amplifiers, becoming familiar with the commercial software “Microwave Office” of AWR.

In addition to this, the student will have the opportunity to make laboratory experiences, performing the measurement of the diffusion parameters of 1-port and 2-port devices through a vectorial network analyzer. Finally, he will be able to quantitatively evaluate the non linear behaviour of 2-port devices, with particular reference to “Microwave over Fiber” networks.

Course contents

CAD DESIGN OF IMPEDANCE MATCHING NETWORKS

 

Brief recall on Transmission Lines, Smith Chart, Matching Networks

 

CAD design of narrowband matching networks: lumped elements networks, simple and double stub networks.

 

CAD design of narrowband matching networks: multisection transformers

 

 

CAD DESIGN OF SINGLE STAGE MICROWAVE AMPLIFIERS

 

Brief recall on the Diffusion Parameters.

 

Gains of a 2-port linear device.

 

Stability of an amplifier:  Rollet condition,  input and output stability circles.

 

Constant gain circles and constant noise circles in the design of a microwave amplifier.

 

CAD design of microwave single stage amplifiers. 

 

 

NON LINEARITIES OF A TWO-PORT DEVICE

 

Gain compression

 

Distortions and corresponding intercept points.

 

Spurious free Dynamic Range.

 

 

LABORATORY EXPERIENCES WITH VECTORIAL NETWORK ANALYZER.

 

General block diagram of a Network Analyzer. Calibration of the instrument.

 

Measurement of the Diffusion Parameters of simple devices.

 

Measurement of the Diffusion Parameters of a “Microwave over Fiber” link.

Readings/Bibliography

D. Pozar, "Microwave Engineering", Wiley

Teaching methods

Frontal teaching

Software laboratory activities

Assessment methods

Design Exercise to be performed through

the modelling programs utilized in the course followed by a brief oral part

Teaching tools

http://elearning.ing.unibo.it/corso.php?id_autore=&id_insegnamento=138&aa=2004&RIL=A-Z&IDCDS=5

Office hours

See the website of Giovanni Tartarini