Name: R.Shobana sree
Reg No:1042255
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DESIGN OF MICROSTRIP COUPLER USING ADS
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EXP.NO: 4 DATE:
OBJECTIVE:
To design a microstrip coupler using advanced design system software.
SOFTWARE REQUIRED:
Advance Design System
®
2008
THEORY:
When two transmission lines are close together, because of the interaction of the
electromagnetic fields of each line, power can be coupled between the lines. Those coupled
lines are used to construct directional couplers. Generally, in design of directional couplers
microstrip and stripline forms are used. Although microstrip transmission lines do not
support TEM and named as quasi-TEM, usually they are assumed to operate in TEM
mode. It is important that whether true TEM or not, all parallel line couplers have odd and
even mode, and resulting Zoe and Zoo (even and odd mode impedances respectively). In
the analysis of the directional couplers we will use also even-odd mode analysis.
There are many kinds of directional couplers in different forms. However
directional couplers we will mention here are single and three section microstrip directional
couplers.