Creating multiple circuit using same nport RF object in MATLAB with different node assignment?

I am trying to create multiple circuit using same RF objects having with different topology but getting an error shown below.

%% code for different topology

ckt = circuit('h1');

for i = 1:total_elements

add(ckt,[nport_node1(i) nport_node2(i)],nport_obj{i});

end

ckt1 = circuit('h2');

for i = 1:total_elements

add(ckt1,[nport_node2(i) nport_node1(i)],nport_obj{i});

end

%The error that I get

Error using rf.internal.circuit.Circuit/add

Cannot add nport 'Sparams' to circuit 'h2': nport 'Sparams' already belongs to a circuit.

Would you please let me know how can I create different topology using same circuit objects?

Answer 1

[Namnendra]

The error message suggests that you are trying to add the same `nport_obj` (which is an `S-parameters` object) to multiple circuits.

To create different circuits with different topologies, you should create separate `S-parameters` objects for each circuit. You can create the `S-parameters` objects outside the `for` loop and then use them in both circuits. Here's an example:

% create S-parameters object for circuit 1
sparams1 = rfdata.network;
sparams1.S = ... % define your S-parameters here
    
% create circuit 1
ckt1 = circuit('h1');
for i = 1:total_elements
    add(ckt1, [nport_node1(i) nport_node2(i)], sparams1); 
end 

% create S-parameters object for circuit 2
sparams2 = rfdata.network;
sparams2.S = ... % define your S-parameters here
    
% create circuit 2
ckt2 = circuit('h2');
for i = 1:total_elements
    add(ckt2, [nport_node2(i) nport_node1(i)], sparams2); 
end 

In this way, you can create multiple circuits with different topologies using different `S-parameters` objects.