hold on function does not work

I am trying to plot both graph in one polar plot , but command hold on doesn't work properly.

here it is the code

[dpb]

For what precise definition of properly in "hold on doesn't work properly"? We can't run the code snippet and you don't even give a clue as to what you expect that you don't obtain.

[Star Strider]

I have no idea what ‘polar_dB’ is, but if it uses the polar function, polar is notoriously difficult to work with.

[Image Analyst]

Attach the code for your custom function polar_dB().