Wide band biconical antennas with an integrated matching system
View Patent ↗A biconical antenna includes an entry conic having an entry base opposite an entry vertex and a termination conic having a termination base opposite a termination vertex. The entry and termination conics share substantially the same axis and the entry vertex is adjacent the termination vertex. The transmission line is received by the entry conic and terminated in the termination conic. Together, the entry conic and the termination conic phase correct energy emanating from the transmission line. Another embodiment of the antenna comprises an entry conic having at least two sub-conics and a termination conic having at least two sub-conics. Each of the sub-conics having an integer multiple of a half-angle. The biconical antenna may also include a multi-conductor transmission line, wherein the biconical antennas are arranged in a co-linear relationship. Each of the multi-conductors is coupled to at least one of the plurality of biconical antennas. The biconical antennas may also be constructed on a circuit board substrate.
1. A wideband antenna comprising:
a non-conductive substrate having a conic side opposite a transmission side;
a transmission line disposed on said transmission side; and
at least two effective conics disposed on said conic side and spaced apart from each other, said transmission line disposed within a ground plane formed by one of said conics and connected at an end to one of the other of said conics.
2. The antenna according to claim 1 , wherein said at least two effective conics comprise:
an entry conic having an entry vertex; and
a termination conic having a termination vertex, said conics axially aligned with each other and said vertices having a vertex gap therebetween.
3. The antenna according to claim 2 , further comprising:
a network connected to said transmission line.
4. The antenna according to claim 3 , wherein said network is selected from a group consisting of a resistor, an inductor, a capacitor, and combinations thereof.
5. The antenna according to claim 3 , wherein said network is disposed within said ground plane.
6. The antenna according to claim 2 , wherein said termination conic and said substrate have a conic aperture therethrough.
7. The antenna according to claim 6 , further comprising:
a wire having one end connected to said transmission line, and an opposite end directed through said conic aperture and connected to said termination conic.
8. The antenna according to claim 2 , wherein said entry conic and said termination conic each have a half-angle of about 9 degrees plus or minus 2 degrees.
9. The antenna according to claim 1 , further comprising:
a line connector having a ground connection connected to one of said conics and a line tab connected to said transmission line.
10. The antenna according to claim 9 , wherein said line tab is axially oriented with respect to said conics.
11. The antenna according to claim 1 , wherein said transmission line is sized to provide a desired resistance value.
12. The antenna according to claim 1 , further comprising:
a matching system which includes said transmission line which is effectively received in an axial orientation with respect to said entry conic to transform an impedance value of said transmission line to a desired impedance value.
13. The antenna according to claim 1 , further comprising:
a line connector having a ground connection connected to one of said conics and a line tab connected to said transmission line, such that said line tab is axially oriented with respect to said conics.
14. The antenna according to claim 1 , wherein said at least two effective conics comprise:
an entry conic having an entry vertex opposite an entry base;
a termination conic having a termination vertex opposite a termination base;
wherein said entry conic is bounded by entry sides that extend continuously from said entry vertex to said entry base, and wherein said termination conic is bounded by termination sides that extend continuously from said vertex to said termination base.
15. The antenna according to claim 14 , wherein said conics are axially aligned with each other.
16. The antenna according to claim 1 , wherein the antenna has an instantaneous bandwidth of 500 to 2500 MHZ with a Voltage Standing Wave Ratio of 3.0 or less.