High efficiency antenna
Antenna designs are disclosed that exhibit both high bandwidth and efficiency. A first aspect of the invention concerns the form factor of the antenna; a second aspect of the invention concerns the ease with which the antenna is manufactured; and a third aspect concerns the superior performance exhibits by the antenna across a large bandwidth.
1. An antenna, comprising:
two conductive metal antenna elements, each element comprising one-half of a dipole antenna;
each antenna element being a mirror image of the other and formed on a rigid substrate in spaced relation to define a gap there between that provides stable antenna impedance and reactance, a portion of each antenna element at said gap defining a connection pad for connecting a coaxial cable thereto, each antenna element having a profile defining a curved, semi-circular inner edge and an arc-shaped outer edge that define the connection pad of the antenna element at the gap;
wherein each antenna element extends from a narrow portion thereof to a point where the edges diverge and define a wide, curved upper element portion, the outer edge of each antenna element further defining a semi-circular projection that bulges from an upper portion of the outer antenna element edge.
2. The antenna of claim 1 , wherein said antenna operates in the 2.4 GHz band.
3. The antenna of claim 1 , wherein said rigid substrate comprises a single layer PCB.
4. The antenna of claim 1 , wherein said gap is about 0.5 mm.
5. The antenna of claim 1 , each antenna element defining therein one or more tuning holes that have an initial diameter, wherein selectively enlarging the diameter of one or more of said holes establishes a desired antenna characteristic.
6. The antenna of claim 1 , wherein the profile each of said antenna elements is constructed from a series of overlapping arcs.
7. The antenna of claim 1 , wherein said elements provide an omnidirectional radiation pattern of about 2.4 GHz-2.5 GHz and an S11←10 dB from 2.4 GHz-2.5 GHz.
8. An antenna, comprising:
two conductive metal antenna elements, each element comprising one-half of a dipole antenna;
each antenna element being a mirror image of the other and formed on a rigid substrate in spaced relation to define a gap there between that provides stable antenna impedance and reactance, a portion of each antenna element at said gap defining a connection pad for connecting a coaxial cable thereto, each antenna element having a profile defining a curved, semi-circular inner edge and an arc-shaped outer edge that define the connection pad of the antenna element at the gap;
wherein each antenna element extends from a narrow portion thereof to a point where the edges diverge and define a wide, curved upper element portion that provides wide bandwidth performance;
wherein the curved, semi-circular inner edge and curved upper element portion are provided to increase a current path and shift a resonate frequency of the antenna lower, the outer edge of each antenna element further defining a semi-circular, projection that bulges from an upper portion of the outer antenna element edge and that provides serial inductance to miniaturize the antenna size.
9. The antenna of claim 8 , wherein said antenna operates in the 5 GHz band.
10. The antenna of claim 8 , wherein said rigid substrate comprises a single layer PCB.
11. The antenna of claim 8 , wherein said gap is about 0.5 mm.
12. The antenna of claim 8 , each antenna element defining therein one or more tuning holes that have an initial diameter, wherein selectively enlarging the diameter of one or more of said holes establishes a desired antenna characteristic.
13. The antenna of claim 8 , wherein the profile each of said antenna elements is constructed from a series of overlapping arcs.
14. The antenna of claim 8 , wherein said elements provide an omnidirectional radiation pattern radiation pattern of about 4.9 GHz-5.9 GHz and an S11←10 dB from 4.9 GHz-5.9 GHz with more than 20% bandwidth.
15. A multi-band antenna, comprising:
a first antenna that resonates in a first band, said first antenna comprising two conductive metal antenna elements, each element comprising one-half of a dipole antenna;
each first antenna element being a mirror image of the other and formed on a rigid substrate in spaced relation to define a first critical gap therebetween that provides stable antenna impedance and reactance, a portion of each antenna element at said gap defining a connection pad for connecting a coaxial cable thereto, each antenna element having a profile defining a curved, semi-circular inner edge and an arc-shaped outer edge that define the connection pad of the antenna element at the gap;
wherein each antenna element extends from a narrow portion thereof to a point where the edges diverge and define a wide, curved upper element portion, the outer edge of each antenna element further defining a semi-circular projection that bulges from an upper portion of the outer antenna element edge; and
a second antenna that resonates in a second band, each element of said second antenna formed proximate to, and in electrical contact with, a corresponding element of said first antenna, said second antenna comprising two conductive metal antenna elements, each element comprising one-half of a dipole antenna;
each second antenna element being a mirror image of the other and formed on said rigid substrate in spaced relation to define a second critical gap there between that provides stable antenna impedance and reactance, each antenna element having a profile defining a curved, semi-circular inner edge and an arc-shaped outer edge that define the connection pad of the antenna element at the gap, wherein each antenna element extends from a narrow portion thereof to a point where the edges diverge and define a wide, curved upper element portion that provides wide bandwidth performance;
wherein the curved, semi-circular inner edge and curved upper element portion are provided to increase a current path and shift a resonate frequency of the antenna lower, the outer edge of each antenna element further defining a semi-circular projection that bulges from an upper portion of the outer antenna element edge and that provides serial inductance to miniaturize the antenna size;
wherein a thin metal element is formed in the region of said first and second critical gaps to provide inductance that prevents energy from one set of antenna elements radiating in the other set of antenna elements;
wherein said antenna resonates at two independent frequencies; and
wherein said coaxial cable carries signals for both of said frequencies.
16. The antenna of claim 15 , wherein said antenna operates in the 2.4 GHz band and 5 GHz band.
17. The antenna of claim 15 , wherein said rigid substrate comprises a single layer PCB.
18. The antenna of claim 15 , wherein said first critical gap is about a 0.254 mm gap and said second critical gap is about a 1 mm gap.
19. The antenna of claim 15 , each antenna element defining therein one or more tuning holes that have an initial diameter, wherein selectively enlarging the diameter of one or more of said holes establishes a desired antenna characteristic.
20. The antenna of claim 15 , wherein the profile each of said antenna elements is constructed from a series of overlapping arcs.
21. The antenna of claim 15 , wherein said first antenna elements and said second antenna elements, respectively, provide an omnidirectional radiation pattern about 2.4 GHz-2.5 GHz and about 4.9 GHz-5.9 GHz with an S11←10 dB from 2.4 GHz-2.5 GHz and 4.9 GHz-5.9 GHz.
22. An antenna, comprising:
two conductive metal antenna elements, each element comprising one-half of a dipole antenna;
each antenna element being a mirror image of the other and formed on a rigid substrate in spaced relation to define a first critical gap there between that provides stable antenna impedance and reactance, a portion of each antenna element at said gap defining a connection pad for connecting a coaxial cable thereto, each antenna element having a profile defining a curved, semi-circular inner edge that defines a thin, curved trace that increases serial inductance to lower a first resonate frequency, said trace progressing in thickness to provide an increased current path the creates turbulence for a current flow and that creates radiation at higher frequencies, and a landing pad that defines the connection pad of the antenna element at the gap;
wherein each antenna element extends from said semi-circular inner edge thereof to define two spaced, substantially straight, substantially parallel edges that extend to a common, substantially perpendicular edge thereof, said element defining a cutout portion therein that increases current path and miniaturizes antenna size.
23. The antenna of claim 22 , wherein said antenna operates in the 3G/LTE bands.
24. The antenna of claim 22 , wherein said rigid substrate comprises a single layer PCB.
25. The antenna of claim 22 , wherein said gap is about a 2 mm gap.
26. The antenna of claim 22 , each antenna element defining therein one or more tuning holes that have an initial diameter, wherein selectively enlarging the diameter of one or more of said holes establishes a desired antenna characteristic.
27. The antenna of claim 22 , wherein the profile each of said antenna elements constructed from a series of overlapping arcs.
28. The antenna of claim 22 , wherein said antenna elements provide an omnidirectional radiation (2 dBi gain) pattern from 690-960 MHz, and a directional radiation pattern (4 dBi gain) at 1700-2100 MHz and (6 dBi gain) at 2500-2700 MHz.