Racetrack layout for radio frequency shielding
Aspects of the present disclosure relate to determining a layout of a racetrack that forms part of an RF isolation structure of a packaged module and the resulting RF isolation structures. The racetrack layout can be determined based on identifying low radiating areas of a module and/or areas of a module that are less sensitive to external radiation. The racetrack can be disposed below a surface of a module on which a radio frequency component is disposed. The racetrack and a conductive layer over the radio frequency component can form part of a radio frequency isolation structure around the RF component.
1. A method of determining a racetrack layout, the method comprising:
obtaining electromagnetic interference data for a module, the electromagnetic interference data being associated with an electromagnetic probe;
identifying one or more low radiating areas of the module based on the electromagnetic interference data, the module including a radio frequency component coupled to a major surface of a substrate; and
determining a racetrack layout based on said identifying, the racetrack being disposed such that the major surface of the substrate is between the racetrack and the radio frequency component, the racetrack and a conductive layer forming a portion of a radio frequency isolation structure around the radio frequency component, and the radio frequency component being disposed between the conductive layer and the major surface of the substrate.
2. The method of claim 1 wherein the racetrack layout includes a section with a reduced width in a low radiating area of the one or more low radiating areas relative to a width in other sections of the racetrack layout.
3. The method of claim 1 wherein the racetrack layout includes a break in a low radiating area of the one or more low radiating areas.
4. The method of claim 1 wherein the racetrack layout includes a break in a first low radiating area of the one or more low radiating areas and a narrowed section in a second low radiating area of the one or more low radiating areas.
5. The method of claim 1 wherein said obtaining includes performing the electromagnetic probe.
6. The method of claim 1 wherein the electromagnetic interference data corresponds to two or more modes of operation of the radio frequency component.
7. The method of claim 1 wherein the electromagnetic interference data corresponds to the module without the radio frequency isolation structure.
8. The method of claim 1 wherein the electromagnetic interference data corresponds to the module including a different racetrack layout than the racetrack layout.
9. The method of claim 1 further comprising iterating said identifying and said determining.
10. The method of claim 1 wherein said identifying one or more low radiating areas includes identifying areas of the module configured to emit less radiation than other areas of the module.
11. The method of claim 1 wherein said identifying one or more low radiating areas includes identifying areas of the module configured to receive less external radiation than other areas of the module.
12. The method of claim 1 further comprising determining a second racetrack layout based on said identifying, the second racetrack being disposed in a different layer of the substrate than the racetrack.
13. The method of claim 1 further comprising forming the racetrack layout.
14. The method of claim 1 further comprising additionally identifying areas of the module that are more sensitive to external radiation and areas of the module that are less sensitive to external radiation, said determining being based on said identifying and said additionally identifying.
15. The method of claim 1 wherein a low radiating area of the one or more low radiating areas is associated with a lower activity factor than other areas of the module.
16. The method of claim 1 wherein the radio frequency component includes a power amplifier.
17. The method of claim 6 wherein the two or more modes include a low power mode and a high power mode.
18. The method of claim 6 wherein the two or more modes include a low band mode and a high band mode.
19. The method of claim 1 wherein the racetrack layout includes a first narrowed section in a first low radiating area of the one or more low radiating areas and a second narrowed section in a second low radiating area of the one or more low radiating areas.
20. The method of claim 1 wherein the racetrack layout includes a first break in a first low radiating area of the one or more low radiating areas and a second break in a second low radiating area of the one or more low radiating areas.