Interposer and substrate incorporating same

1. An interposer, comprising:

one or more layers, wherein each of the one or more layers is formed only of a plurality of nanostructures; and

a cavity defined in the one or more layers, wherein the cavity is configured as a waveguide for propagation of electromagnetic waves.

2. The interposer of claim 1 , further comprising a slow-wave structure provided in the one or more layers, the slow-wave structure being in communication with the waveguide.

3. The interposer of claim 2 , wherein the slow-wave structure comprises a slot defined in one of the one or more layers.

4. The interposer of claim 1 , wherein the cavity is configured to comprise one or more of a splitter, a coupler, an antenna feed, a filter, a phase shifter and a crossover.

5. The interposer of claim 3 , wherein the cavity is configured to comprise one of a Y-splitter, a four-way coupler, an array antenna feed, a single cavity filter, a multiple cavity filter, a filtering multiplexer, a delay line phase shifter, a Butler matrix, a hybrid coupler and a ridge waveguide.

6. The interposer of claim 1 , wherein a bend is provided in the waveguide.

7. The interposer of claim 1 , wherein the nanostructures are elongate in shape and are arranged in parallel orientation to one another in each of the one or more layers.

8. The interposer of claim 7 , wherein a height of the nanostructures in each layer corresponds to a thickness of the each layer.

9. The interposer of claim 1 , further comprising an antenna provided in the cavity.

10. The interposer of claim 9 , wherein the antenna is one of an excitation pillar, a slot, a planar antenna, and a coaxial antenna.

11. A substrate, comprising:

a first substrate layer;

a second substrate layer; and

an interposer in accordance with claim 1 between the first and second substrate layers.