Feed structure for a metamaterial antenna system
The present invention is an antenna system having an array of metamaterial cells and a transmission array having a plurality of slots, wherein a signal propagates through the transmission array to the metamaterial cells and radiates a beamform. The system further includes reactance control means to adjust a phase of the beamform and to perform beam steering and beam switching.
1. An antenna system, comprising:
a metamaterial array of unit cells; and
a feed layer arranged as a different layer than a layer of the metamaterial array of unit cells, the feed layer comprising:
an input port;
a distributed feed network of transmission lines configured to divide a signal received at the input port; and
a transmission array coupled to a first side of the distributed feed network, the transmission array having a plurality of transmission lines having a plurality of discontinuities positioned along a length of the plurality of transmission lines,
wherein when the signal propagates through the plurality of discontinuities, an electromagnetic radiation transmission is formed that radiates onto the metamaterial array of unit cells.
2. The antenna system as in claim 1 , further comprising:
a reference substrate layer; and
a dielectric layer positioned between the feed layer and the reference substrate layer.
3. The antenna system as in claim 1 , wherein the discontinuities are slots in a conductive portion of the feed layer.
4. The antenna system as in claim 3 , wherein the slots are rectangular with a longer side positioned along a length of the transmission lines.
5. The antenna system as in claim 4 , further comprising a plurality of irises positioned relative to at least one of the slots.
6. The antenna system as in claim 5 , further comprising:
a transceiver module coupled to the feed layer; and
an object detection module coupled to the transceiver module and adapted to detect an object in a field of view of the antenna system as a function of received signals.
7. The antenna system as in claim 6 , wherein the object detection module is an artificial intelligence (AI) module adapted to classify a detected object.
8. The antenna system as in claim 1 , wherein the antenna system is a radar system, and the antenna system further comprises:
a transmitter adapted to generate transmit frequency modulated continuous wave (FMCW) signals; and
a receiver, comprising:
a mixer adapted to compare transmitted FMCW signals to received FMCW signals.
9. The antenna system as in claim 1 , further comprising a gap positioned between the metamaterial array of unit cells and the feed layer.
10. The antenna system as in claim 1 , wherein the metamaterial array of unit cells comprises multiple layers of metamaterial unit cells.
11. The antenna system as in claim 1 , wherein the metamaterial array is approximately perpendicular to the distributed feed network.
12. The antenna system as in claim 1 , wherein the metamaterial array is approximately parallel to the distributed feed network.
13. The antenna system as in claim 1 , further comprising:
a second distributed feed network coupled to a side of the transmission array.
14. The antenna system as in claim 1 , wherein the transmission array comprises by a plurality of vias defining the transmission lines.