Broadband decoupled midband dipole for a dense multiband antenna
Disclosed is a midband dipole for use in a multiband antenna. The midband dipole has four folded dipoles, each of which is coupled to a decoupling circuit that has two capacitance points. The disclosed decoupling circuit configuration mitigates common mode resonance with nearby lowband dipoles, further preventing cross polarization in the midband.
1 . A radiator for a multiband antenna, comprising:
a dielectric plate;
four decoupling circuits disposed on a first side of the dielectric plate; and
four folded dipole arms disposed on a second side of the dielectric plate,
wherein the dielectric plate has four vias, each via having a conductive trace that couples a given decoupling circuit to a corresponding folded dipole arm.
2 . The radiator of claim 1 , wherein the dielectric plate comprises a Printed Circuit Board (PCB).
3 . The radiator of claim 1 , wherein each of the four decoupling circuits comprises a first conductive layer disposed on the dielectric plate.
4 . The radiator of claim 1 , wherein each of the four folded dipole arms comprises a second conductive layer disposed on the dielectric plate.
5 . The radiator of claim 1 , wherein the first side of the dielectric plate comprises an upper side of the dielectric plate.
6 . The radiator of claim 5 , wherein the second side of the dielectric plate comprises a lower side of the dielectric plate.
7 . The radiator of claim 1 , wherein each of the four decoupling circuits comprises:
a first capacitive pad;
a second capacitive pad; and
a first inductive trace coupled to the first capacitive pad.
8 . The radiator of claim 7 , wherein the first inductive trace conductively couples through the via to a second inductive trace disposed on the second side of the dielectric plate, wherein the second inductive trace is electrically coupled to the corresponding folded dipole arm.