Wireless communications with dielectric medium
An electronic device may include a dielectric substrate, an electronic circuit supported by the substrate, for processing data, and a communication unit having an antenna. The communication unit may be mounted to the substrate in communication with the electronic circuit for converting between a first EHF electromagnetic signal containing digital information and a data signal conducted by the electronic circuit. The electromagnetic signal may be transmitted or received along a signal path by the antenna. An electromagnetic signal guide assembly may include a dielectric element made of a dielectric material disposed proximate the antenna in the signal path. The electromagnetic signal guide may have sides extending along the signal path. A sleeve element may extend around the dielectric element along sides of the dielectric element. The sleeve element may impede transmission of the electromagnetic signal through the sides of the dielectric element.
1. An electronic device, comprising:
a transceiver integrated circuit (IC) configured to transmit or receive an electromagnetic signal operating in an extremely high frequency (EHF) band;
a first dielectric portion having a first dielectric constant, the first dielectric portion at least partially covering the transceiver IC and configured to direct the electromagnetic signal in the EHF band; and
a second dielectric portion having a second dielectric constant and laterally surrounding the first dielectric portion.
2. The electronic device of claim 1 , wherein the first dielectric constant is greater than the second dielectric constant.
3. The electronic device of claim 1 , wherein the first dielectric portion comprises plastic.
4. The electronic device of claim 1 , wherein the second dielectric portion comprises foam.
5. The electronic device of claim 1 , wherein the second dielectric portion comprises an air gap.
6. The electronic device of claim 1 , wherein the second dielectric portion comprises an opening that exposes a top surface of the first dielectric portion, the first dielectric portion disposed within the opening of the second dielectric portion to be laterally surrounded by the second dielectric portion.
7. The electronic device of claim 1 , wherein a top surface of the transceiver IC is covered by the first dielectric portion.
8. The electronic device of claim 1 , wherein the first dielectric portion directs the electromagnetic signal in the EHF band from the transceiver IC toward the opening of the second dielectric portion, or directs the electromagnetic signal in the EHF band from the opening of the second dielectric portion toward the transceiver IC.
9. The electronic device of claim 1 , wherein both the first dielectric portion and the second dielectric portion are rectangular in shape.
10. The electronic device of claim 1 , wherein the both the first dielectric portion and the second dielectric portion are concentric rectangles in shape.
11. The electronic device of claim 1 , further comprising a conductive portion laterally surrounding the second dielectric portion.
12. The electronic device of claim 11 , wherein the conductive portion is configured to suppress ingress or egress of spurious radiation of the electromagnetic signal in the EHF band.
13. The electronic device of claim 11 , wherein the second dielectric portion isolates the first dielectric portion from the conductive portion.
14. The electronic device of claim 11 , wherein the conductive portion comprises another opening that exposes a top surface of the first dielectric portion and a top surface of the second dielectric portion that laterally surrounds the first dielectric portion, both the first dielectric portion and the second dielectric portion disposed within the opening of the conductive portion to be laterally surrounded by the conductive portion.
15. The electronic device of claim 11 , wherein the first dielectric portion, the second dielectric portion, and the conductive portion are rectangular in shape.