  For unsigned graphs G and H, the characteristic polynomial of different graph
matrices for edge corona, subdivision vertex neighbourhood corona and
subdivision edge neighbourhood corona has already been studied using the
concept of coronal. However, till date no work regarding the spectrum of these
products has been studied for signed graphs. In our work, we have filled this
gap and defined these variants of coronae by introducing the concept of reverse
orientation (r-orientation). We analyzed the structural properties of these
product. Also, the characteristic polynomial of adjacency matrix, Laplacian
matrices (signed and signless) and normalized Laplacian matrix of these
variants of corona product of regular signed graphs under $r$-orientation is
obtained using the concept of signed coronal. These results help us to
construct infinitely many families of pairs of cospectral signed graphs.
