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RF Links
microwaves101.com


This page
provides announcements about ECE 585. This page last updated February
3, 2005. These announcements will not necessarily be synchronized or kept
up to date with the announcements on the primary
online website, so you should check there first.
Date 
Announcement 
Details 
Wed
Feb 2 
help
for Prob. 7.33 
The
Bailey power divider is a very useful device. Here's a hint
on analyzing this 3way network, for Problem 7.33. 
Wed
Feb. 2 
help
for Prob. 76 
Here's
an approach to solving Prob. 76. Start with the Tee network and
use Table 4.1 to calculate the A, B, C, and D parameters in terms
of R1 and R2. Then use Table 4.2 to convert these to Sparameters
(this will also involve Zo); you only need S11 and S12. Note that
for a matched network, S11 = 0. Also note that S12 = alpha (make
sure you understand why this is true). Then do several lines of
algebra to come up with design equations for R1 and R2 in terms
of alpha and Zo. To check your equations for Zo = 50 ohms, note
that when alpha (dB) = 3 dB, alpha = 0.708, R1 = 8.6 ohms, and R2
and 141.9 ohms.
Follow the same
procedure for the Pi network. To check your equations when Zo =
50 ohms, let alpha (dB) = 3 dB, then R1 = 292.5 ohms and R2 = 17.6
ohms. 
Thur,
Jan 27 
RFmicrowave
software 
Check
out this part of the website with links to useful
RFmicrowave software programs. Most of these are free downloads! 
Thur,
Jan 27 
HP
App note on Sparameters 
Here
is an outstanding HP app note on Sparameters
and their use in design. I highly recommend it! This is a PDF document
(1.2 MB), lots of nice color illustrations. This is definitely worth
downloading and adding to your files. You'll need Adobe Acrobat Reader
to read the file. 
Thur,
Jan. 27 
4port
Sparameters 
Here
is a 14slide presentation (PDF, readable
by Adobe Acrobat) on scattering parameters for 4ports, etc. There
are just three concluding equations, one for total power into the
network, and the other two conditions for a lossless Nport network.
This is supplemental material to Lecture 1. 
Thur,
Jan. 27 
PDF
docs access 
You
will need a password to access lecture notes and HW solutions on this
website. A password will be given to all students registered for this
course upon email request to kcarver@ecs.umass.edu.
Students not enrolled in this course will not be given password access. 
Thur,
Jan. 27 
HW
problem answers 
Click
on Homework Help for answers
to many of the HW problems in the first five HW sets, so you can determine
if your solution method is on track. Complete solutions to the HW
sets will be posted as PDF documents about a week after they are due.
You can use this, coupled with TA comments on your graded HWs, to
check your understanding of the HW material. 
Thur,
Jan. 27, 2005 
Midterm
Exam date 
The
midterm exam will cover Chapters 7 and 8 (Lectures 1 through 11A),
and will be given to oncampus students on March XX, 6:30  8:30 p.m.
Midterm exams from NTU and PEEAS students are due (FAX date or Express
Mail date) on March XX, 2005. 

