  Two types of novel graphene-based components, namely, filters and
electro-optical switches in guided wave configuration are suggested and
analysed. The filters differ from the known ones with collinear orientation of
the input and output waveguides by geometry and symmetry. The components
consist of a circular graphene disk and two nanoribbons oriented at $90^\circ$
to each other in the plane of the graphene layer. The graphene elements are
placed on a dielectric substrate. We show that change in symmetry leads to a
drastic change in the properties of the components. The physical principle of
the devices is based on the dipole, quadrupole and hexapole resonances in the
graphene disk which define stop-band, pass-band and stop-band frequency
characteristics, respectively. A combination of stop-band and pass-band filter
properties by shifing the electronic Fermi level allows one to design a switch.
Numerical simulations show that the suggested components have very small
dimensions, good characteristics and provide a dynamic control of their central
frequency via electrostatic gating.
