Aperture-fed, stacked-patch antenna assembly
Directive gain antenna elements implemented with an aperture-fed patch array antenna assembly are described. A feed network for the aperture-fed patch array may include offset apertures and may also include meandering feed lines. Scalable aperture shapes and orientations that can be used with antennas operating at any frequency and with dual orthogonal polarizations are also disclosed. Directive gain antenna elements implemented with arrays of orthogonal reflected dipoles are also described with optimal feed networks and parasitic elements to achieve desired directive gain characteristics. Such arrayed dipole antennas feature dual orthogonal polarizations with assembly tabs that lower cost and improve reliability. Backhaul radios that incorporate said antennas are also disclosed.
1. An antenna assembly comprising:
a plurality of first substrates, each of the plurality of first substrates comprising a unitary dipole antenna element and a slot;
a second substrate comprising a plurality of coplanar dipole antenna elements and a plurality of slots; and
a third substrate, wherein the plurality of first substrates are coupled to the third substrate, and wherein the plurality of slots in the second substrate are configured to engage with the slot in each of the plurality of first substrates to form a two-port, orthogonally polarized dipole antenna array, wherein the third substrate is a multi-layer substrate, and wherein the multi-layer substrate comprises:
a first layer comprising a conductive plane, a plurality of conductor connection clearances and a plurality of mechanical slots; and
a second layer comprising a transmission line feed network comprising a plurality of microstrip feed structures corresponding to the unitary dipole antenna elements of the plurality of first substrates and the coplanar dipole antenna elements of the second substrate,
wherein the unitary dipole antenna elements of the plurality of first substrates and the coplanar dipole antenna elements of the second substrate are interleaved.
2. The antenna assembly of claim 1 , wherein the second substrate is used for vertical polarization.
3. The antenna assembly of claim 1 , wherein the plurality of first substrates are used for horizontal polarization.
4. The antenna assembly of claim 1 , wherein each of the plurality of first substrates is orthogonal to the second substrate.
5. The antenna assembly of claim 1 , wherein the third substrate is formed from a printed circuit board.
6. The antenna assembly of claim 1 , wherein the number of the first plurality of substrates is equal to the number of the plurality of coplanar dipole antenna elements.
7. The antenna assembly of claim 1 , wherein the unitary dipole antenna element comprises a coplanar dipole with two dipole branches and two respective parasitic elements.
8. The antenna assembly of claim 1 , wherein the unitary dipole antenna element is configured to provide a horizontally polarized far-field directive gain antenna pattern.
9. The antenna assembly of claim 7 , wherein the coplanar dipole is a one-half wavelength resonant dipole.
10. The antenna assembly of claim 7 , wherein the coupling mechanism between the two dipole branches and the two respective parasitic elements is primarily electric.
11. The antenna assembly of claim 7 , wherein the first substrate further comprises a coplanar feed line pair connected to the coplanar dipole.
12. The antenna assembly of claim 11 , wherein the coplanar feed line pair is coupled to a feed network in the third substrate.
13. The antenna assembly of claim 1 , wherein the second substrate further comprises a plurality of respective feed lines coupled to the plurality of coplanar dipole antenna elements and a feed network in the third substrate.
14. The antenna assembly of claim 1 , wherein the plurality of coplanar dipole antenna elements are located on a same side of the second substrate.
15. The antenna assembly of claim 1 , wherein the third substrate comprises a transmission feed line network electrically coupled to the unitary dipole element of each of the plurality of first substrates and each of the plurality of coplanar dipole antenna elements of the second substrate.
16. The antenna assembly of claim 1 , wherein the third substrate comprises a plurality of slots and wherein each of the plurality of first substrates comprise a tab, wherein the tab of each of the plurality of first substrates mechanically engages with the plurality of slots in the third substrate.
17. The antenna assembly of claim 1 , wherein each of the plurality of first substrates is mechanically coupled to the third substrate.
18. The antenna assembly of claim 1 , further comprising a dielectric spacer between the first substrate and the second substrate.
19. The antenna assembly of claim 1 , wherein the third substrate further comprises tuning elements.