Antonio Post subject: Microstrip Tapped Line filter Design Posted:
Fri Jun 29, 2007 5:31 am
Captain
Joined: Sat
Jun 16, 2007 12:26 am Posts: 12 Hi All,
Can you tell
me how to find out the tapped point and tapped length in a Edge
coupled tapped line filter design?
I am trying to design
a band pass filter using Edge coupled tapped line structure.
The inputs I have are impedances, Er, substrate information.
I am not able to find out the way to calculate tapped point and
tapped length using all these inputs.
Is there any way to
find out the tapped length and tapped point using ADS tool? If it
is then how?
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trobbio Post subject: Posted:
Sat Jan 03, 2009 1:39 pm
Lieutenant
Joined: Fri Jan
02, 2009 12:27 pm Posts: 1 Search for an IEEE article titled
"Microstrip TappedLine Filter Design" by Joseph S. Wong. That article
gives the design procedure and all the math behind selecting the
tap point.
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nubbage Post subject: Posted:
Tue Jan 06, 2009 12:09 pm
General
Joined: Fri
Feb 17, 2006 12:07 pm Posts: 218 Location: London UK If
you cannot locate that, a simple highlevel approach is to set the
internal impedance level of the filter (say 200 ohms or whatever),
which can improve the design process. Then the tapping point is
simply derived from the ratio of internal and external (50 ohm)
impedance, the endline characteristic Z, and the loaded Q of the
input/output resonators. The formula is
tap point = Len
* ASIN(SQRT(PI*Zs/(4*Z0*Ql)))
where len is the length of
the end resonator, Zs is the internal impedance (100 ohm, 200
ohm or whatever) Z0 is the characteristic impedance of the end
resonator in its geometric environment and Ql is the loaded
Q of the end resonator, derived from graphs. The process is
described in the RSGB Microwave Handbook, a 3 volume set.
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Posted 11/12/2012
