Main Content


Design branchline coupler around particular frequency

Since R2021b


coupler = design(couplerobj,frequency) designs a branchline coupler around the specified frequency.


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


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


collapse all

Design a branchline coupler at 1.8 GHz and with a Z0 of 75 ohms.

coupler = design(couplerBranchline,1.8e9,Z0=75);

Figure contains an axes object. The axes object with title couplerBranchline 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);

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

collapse all

Branchline coupler, specified as a couplerBranchline object.

Example: coupler = couplerBranchline; design(coupler,2e9) designs a branchline coupler around a frequency of 2 GHz.

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

Example: 3e9

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

Characteristic impedance of the coupler, specified as a positive scalar in ohms.

Data Types: double

Output Arguments

collapse all

Branchline coupler operating around the specified frequency, returned as a couplreBranchline object.

Version History

Introduced in R2021b

See Also