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An antenna apparatus and method includes an orthogonal slot antenna which overcomes the limitations associated with RF choke between the adjacent slots through various feed techniques. A cavity backed cross-slot antenna includes a horizontal slot antenna, a vertical slot antenna sharing a center por

An antenna apparatus and method includes an orthogonal slot antenna which overcomes the limitations associated with RF choke between the adjacent slots through various feed techniques. A cavity backed cross-slot antenna includes a horizontal slot antenna, a vertical slot antenna sharing a center portion with the horizontal slot antenna, a first feed for the horizontal slot antenna, and a second feed for the vertical slot antenna, the first feed and the second feed provided to the shared center portion. Another cavity backed cross-slot antenna includes a horizontal slot antenna, a vertical slot antenna, the horizontal slot antenna and the vertical slot antenna share a center portion therebetween, a first feed feeding both halves of the horizontal slot antenna, and a second feed feeding both halves of the vertical slot antenna.

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1. A cavity backed cross-slot antenna, comprising: a horizontal slot antenna disposed in an RF ground plane;a vertical slot antenna disposed in the RF ground plane and sharing a center overlapping slot portion with the horizontal slot antenna, the horizontal slot antenna and the vertical slot antenn

1. A cavity backed cross-slot antenna, comprising: a horizontal slot antenna disposed in an RF ground plane;a vertical slot antenna disposed in the RF ground plane and sharing a center overlapping slot portion with the horizontal slot antenna, the horizontal slot antenna and the vertical slot antenna include a cavity backing;a first feed for the horizontal slot antenna; anda second feed for the vertical slot antenna, the first feed and the second feed provided to the shared center portion and positioned diagonally with respect to one another at a center of each slot antenna to overlap orthogonally to alleviate radio frequency choking between the horizontal slot antenna and the vertical slot antenna when being symmetrically and simultaneously fed. 2. The cavity backed cross-slot antenna of claim 1, wherein the cavity backing presents a shielded structure. 3. The cavity backed cross-slot antenna of claim 1, wherein the horizontal slot antenna and the vertical slot antenna are one of integrally formed in the ground plate and disposed on the ground plate. 4. The cavity backed cross-slot antenna of claim 1, wherein the shared center portion is configured to be partially capacitive. 5. The cavity backed cross-slot antenna of claim 1, wherein the first feed and the second feed are positioned diagonally with respect to one another at the shared center portion to be overlapping to create a capacitive coupling therebetween. 6. The cavity backed cross-slot antenna of claim 5, wherein the capacitive coupling is negated by an inductor coupled between the feeds. 7. The cavity backed cross-slot antenna of claim 1, wherein the horizontal slot antenna and the vertical slot antenna are configured to be longer than a resonant length to make their impedance capacitive to negate feed series inductance. 8. The cavity backed cross-slot antenna of claim 1, wherein the first feed and the second feed each feed the horizontal slot antenna and the vertical slot antenna, respectively and simultaneously, with a single phase combination providing isolation in a radiated signal. 9. The cavity backed cross-slot antenna of claim 1, wherein the horizontal slot antenna and the vertical slot antenna are slightly asymmetrical to one another to create an imbalance reactance between them with one being capacitive and one being inductive resulting in a phase difference in the excitation. 10. A cavity backed cross-slot antenna, comprising: a horizontal slot antenna disposed in an RF ground plane;a vertical slot antenna disposed in the RF ground plane, the horizontal slot antenna and the vertical slot antenna share a center overlapping slot portion therebetween, the horizontal slot antenna and the vertical slot antenna include a cavity backing in a shielded structure;a first feed feeding both halves of the horizontal slot antenna; anda second feed feeding both halves of the vertical slot antenna, the first and second feeds being positioned diagonally with respect to one another across a center of each slot antenna to overlap orthogonally to alleviate radio frequency choking between the horizontal slot antenna and the vertical slot antenna. 11. The cavity backed cross-slot antenna of claim 10, wherein the cavity backing presents a shielded structure. 12. The cavity backed cross-slot antenna of claim 10, wherein the horizontal slot antenna and the vertical slot antenna are one of integrally formed in the ground plate and disposed on the ground plate. 13. The cavity backed cross-slot antenna of claim 10, wherein the horizontal slot antenna and the vertical slot antenna are configured to be longer than a resonant length to make their impedance capacitive to negate feed series inductance. 14. The cavity backed cross-slot antenna of claim 10, wherein the first feed symmetrically feeds both the halves of the horizontal slot antenna and the second feed symmetrically feeds both the halves of the vertical slot antenna, the symmetrically feeding provides equal excitation to each half of the horizontal slot antenna and to each half of the vertical slot antenna. 15. The cavity backed cross-slot antenna of claim 10, wherein the horizontal slot antenna and the vertical slot antenna are slightly asymmetrical to one another to create an imbalance reactance between them that is frequency sensitive, resulting in a phase difference in the excitation between them that is frequency sensitive and an amplitude difference in the excitation between them that is frequency sensitive. 16. The cavity backed cross-slot antenna of claim 10, wherein the first feed and the second feed are positioned diagonally with respect to one another at the shared center portion to be overlapping to create capacitive coupling therebetween to be compensated by an inductance provided by an inductor coupled between the feeds. 17. The cavity backed cross-slot antenna of claim 10, wherein each of the first feed and the second feed comprise: a common portion;a split portion comprising a first half and a second half, the first half and the second half coupled therebetween and coupled to the common portion; anda first feed portion coupled to the first half and to one of the halves of one of the horizontal slot antenna and the vertical slot antenna,wherein a combined length of the split portions of each feed are equal in wavelength to provide co-phase excitation of each half of the appropriate slot antenna. 18. The cavity backed cross-slot antenna of claim 17, wherein: a length of the first half of the split portion and the first feed portion is approximately equal to one half of a wavelength associated with the cavity backed cross-slot antenna; anda length of the second half of the split portion and the second feed portion is approximately equal to one half of a wavelength associated with the cavity backed cross-slot antenna,wherein the common portion and the split portion have different impedances. 19. The cavity backed cross-slot antenna of claim 10, wherein the first feed and the second feed are not interconnected therebetween. 20. A method, comprising: providing a horizontal slot antenna and a vertical slot antenna disposed in an RF ground plane and overlapping therebetween in a shared center portion, the horizontal slot antenna and the vertical slot antenna comprising a cavity backing;feeding each of the horizontal slot antenna and the vertical slot antenna at the center shared portion, the first and second feed being positioned diagonally with respect to one another to overlap orthogonally to alleviate radio frequency choking between the horizontal slot antenna and the vertical slot antenna due to the shared center portion; andoperating the horizontal slot antenna and the vertical slot antenna being fed symmetrically and simultaneously in a polarization diverse manner.