design

Design rat-race coupler around specified frequency

Since R2021b

Syntax

coupler = design(couplerobj,frequency)

coupler = design(___,Name=Value)

Description

coupler = design(couplerobj,frequency) designs a rat-race coupler around the specified frequency.

coupler = design(___,Name=Value) designs a rat-race coupler line with additional options specified using name-value arguments.

Note

PCB components designed using the design function operate around the specified frequency with a 10-15% tolerance.

example

Examples

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Design Rat-race Coupler Around 1.8 GHz

Open Live Script

Design a rat-race coupler at 1.8 GHz and with a charecteristic impedance of 75 ohms.

coupler = design(couplerRatrace,1.8e9,Z0=75);
show(coupler);

Figure contains an axes object. The axes object with title couplerRatrace element, xlabel x (mm), ylabel y (mm) contains 8 objects of type patch, surface. These objects represent PEC, feed, Teflon.

Plot the S-parameters of the coupler at 1.8 GHz.

spar = sparameters(coupler,1.8e9);
rfplot(spar)

$Figure contains an axes object. The axes object with xlabel Frequency (GHz), ylabel Magnitude (dB) contains 16 objects of type line. These objects represent dB(S_{11}), dB(S_{21}), dB(S_{31}), dB(S_{41}), dB(S_{12}), dB(S_{22}), dB(S_{32}), dB(S_{42}), dB(S_{13}), dB(S_{23}), dB(S_{33}), dB(S_{43}), dB(S_{14}), dB(S_{24}), dB(S_{34}), dB(S_{44}).$

Input Arguments

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`couplerobj` — Rat-race coupler
`couplerRatrace` object

Rat-race coupler, specified as a couplerRatrace object.

Example: coupler = couplerRatrace; design(coupler,2e9) designs a rat-race coupler around a frequency of 2 GHz.

`frequency` — Design frequency of rat-race coupler
real positive scalar

Design frequency of the rat-race coupler, specified as a real positive scalar in hertz.

Example: 2.5e9

Data Types: double

Name-Value Arguments

Specify optional pairs of arguments as Name1=Value1,...,NameN=ValueN, where Name is the argument name and Value is the corresponding value. Name-value arguments must appear after other arguments, but the order of the pairs does not matter.

Example: Z0=70