Integration of millimeter wave antennas in reduced form factor platforms
Generally, this disclosure provides systems, devices and methods for integration of millimeter wave antennas in platforms with reduced form factors while maintaining or improving antenna gain. An antenna assembly may include a first planar substrate; a ground plane disposed on the first planar substrate; a second planar substrate disposed on the ground plane; and an antenna radiation element disposed on the second planar substrate. The antenna radiation element may be configured to transmit a signal in the millimeter wave frequency region. The assembly may also include a via to provide a conductive path for the signal from a microstrip feed line, beneath the first planar substrate, to the antenna radiation element. The assembly may further include a dielectric layer disposed on the antenna radiation element to provide increased antenna gain under conditions of reduced air gap between the antenna radiation element and a structural element of an enclosing platform.
1. A millimeter wave antenna assembly comprising:
a first planar substrate;
a ground plane disposed on said first planar substrate;
a second planar substrate disposed on said ground plane;
an antenna radiation element disposed on said second planar substrate, said antenna radiation element to transmit a signal in a millimeter wave frequency region;
a via through said first planar substrate and through at least a portion of the second planar substrate, the via to provide a conductive path for said signal from a microstrip feed line to said antenna radiation element, said microstrip feed line disposed beneath said first planar substrate; and
a dielectric layer disposed on said antenna radiation element to provide increased antenna gain under conditions of reduced air gap between said antenna radiation element and a structural element of an enclosing platform.
2. The antenna assembly of claim 1 , wherein said dielectric layer comprises a thickness in the range of 7 micrometers (um) to 90 um.
3. The antenna assembly of claim 1 , wherein said dielectric layer comprises a dielectric constant in the range of 1 to 8.
4. The antenna assembly of claim 1 , wherein said reduced air gap is in the range of 0 millimeters (mm) to 0.2 mm.
5. The antenna assembly of claim 1 , wherein said signal is in the frequency range of 56 gigahertz (GHz) to 64 GHz.
6. The antenna assembly of claim 1 , wherein said increased antenna gain is in the range of 3.5 decibels (dB) to 5 dB.
7. The antenna assembly of claim 1 , wherein said first and second planar substrates comprise a semiconductor material to provide mechanical structure to said antenna assembly and to provide a dielectric medium with a dielectric constant based on the frequency of said signal, a desired radiation pattern and a geometry of said antenna assembly.
8. A method for fabrication of a millimeter wave antenna assembly, said method comprising:
disposing a ground plane on a first planar substrate;
disposing a second planar substrate on said ground plane;
disposing an antenna radiation element on said second planar substrate, said antenna radiation element to transmit a signal in a millimeter wave frequency region;
inserting a via perpendicularly through said ground plane, said first planar substrate, and said second planar substrate, said via to provide a conductive path for said signal from a microstrip feed line, located beneath said first planar substrate, to said antenna radiation element; and
disposing a dielectric layer on said antenna radiation element to provide increased antenna gain under conditions of reduced air gap between said antenna radiation element and a structural element of an enclosing platform.
9. The method of claim 8 , wherein said dielectric layer comprises a thickness in the range of 7 micrometers (um) to 90 um.
10. The method of claim 8 , wherein said dielectric layer comprises a dielectric constant in the range of 1 to 8.
11. The method of claim 8 , wherein said reduced air gap is in the range of 0 millimeters (mm) to 0.2 mm.
12. The method of claim 8 , wherein said signal is in the frequency range of 56 gigahertz (GHz) to 64 GHz.
13. The method of claim 8 , wherein said increased antenna gain is in the range of 3.5 decibels (dB) to 5 dB.
14. The method of claim 8 , wherein said first and second planar substrates comprise a semiconductor material to provide mechanical structure to said antenna assembly and to provide a dielectric medium with a dielectric constant based on the frequency of said signal, a desired radiation pattern and a geometry of said antenna assembly.
15. A platform comprising:
a processor;
a wireless transmitter circuit coupled to said processor, said wireless transmitter circuit to receive a baseband signal for transmission and to convert said baseband signal to a millimeter wave signal;
a microstrip feedline to couple said wireless transmitter circuit to one or more antenna assemblies; and
said one or more antenna assemblies comprising:
a first planar substrate;
a ground plane disposed on said first planar substrate;
a second planar substrate disposed on said ground plane;
an antenna radiation element disposed on said second planar substrate, said antenna radiation element to transmit said millimeter wave signal;
a via through said first planar substrate and through at least a portion of the second planar substrate, the via to provide a conductive path for said millimeter wave signal from said microstrip feed line, located beneath said first planar substrate, to said antenna radiation element; and
a dielectric layer disposed on said antenna radiation element to provide increased antenna gain under conditions of reduced air gap between said antenna radiation element and a structural element of said platform.
16. The platform of claim 15 , wherein said structural element of said platform is a case enclosure.
17. The platform of claim 15 , wherein said dielectric layer comprises a thickness in the range of 7 micrometers (um) to 90 um.
18. The platform of claim 15 , wherein said dielectric layer comprises a dielectric constant in the range of 1 to 8.
19. The platform of claim 15 , wherein said reduced air gap is in the range of 0 millimeters (mm) to 0.2 mm.
20. The platform of claim 15 , wherein said signal is in the frequency range of 56 gigahertz (GHz) to 64 GHz.