Additively manufactured modular aperture antenna with shared shorting post
An antenna assembly includes an antenna feed, a ground plane, a first antenna element, a second antenna element, and a shorting post that is shared between the first and second antenna elements. The first antenna element includes a first conductive dipole arm in planar alignment with a surface of the ground plane and a second conductive dipole arm in planar alignment with the surface of the ground plane and adjacent to the first conductive dipole arm. The second antenna element includes a third conductive dipole arm in planar alignment with the surface of the ground plane and adjacent to the second conductive dipole arm, and a fourth conductive dipole arm in planar alignment with the surface of the ground plane and adjacent to the third conductive dipole arm. The shorting post is in electrical communication with the ground plane, the second conductive dipole arm and the third conductive dipole arm.
1 . An antenna assembly comprising:
an antenna feed configured to receive a signal over a wide bandwidth;
a ground plane;
a first antenna element including a first conductive dipole arm in planar alignment with a surface of the ground plane and a second conductive dipole arm in planar alignment with the surface of the ground plane and adjacent to the first conductive dipole arm;
a second antenna element including a third conductive dipole arm in planar alignment with the surface of the ground plane and adjacent to the second conductive dipole arm, and a fourth conductive dipole arm in planar alignment with the surface of the ground plane and adjacent to the third conductive dipole arm; and
a shorting post in electrical communication with the ground plane, said shorting post further being in electrical communication, by way of only the ground plane, with the second conductive dipole arm of the first antenna element and the third conductive dipole arm of the second antenna element, wherein the shorting post is adjacent to the second conductive dipole arm of the first antenna element and the third conductive dipole arm of the second antenna element;
wherein the first conductive dipole arm, second conductive dipole arm, third conductive dipole arm, and fourth conductive dipole arm extend perpendicularly from the surface of the ground plane.
2 . The antenna assembly of claim 1 , further comprising:
a first feedline in electrical communication with the first conductive dipole arm of the first antenna element and the antenna feed; and
a second feedline in electrical communication with the fourth conductive dipole arm of the second antenna element and the antenna feed.
3 . The antenna assembly of claim 2 , further comprising:
a third feedline in electrical communication with the second conductive dipole arm of the first antenna element and one of the antenna feed and the ground plane; and
a fourth feedline in electrical communication with the third conductive dipole arm of the second antenna element and one of the antenna feed and the ground plane.
4 . The antenna assembly of claim 1 , further comprising at least one non-conductive structural support element between the ground plane and the first antenna element, the second antenna element, or both.
5 . The antenna assembly of claim 4 , wherein the at least one non-conductive structural support includes a dielectric foam or resin.
6 . The antenna assembly of claim 1 , wherein the third conductive dipole arm is perpendicular to the second conductive dipole arm.
7 . The antenna assembly of claim 6 , wherein the first conductive dipole arm is parallel to the second conductive dipole arm, and wherein the fourth conductive dipole arm is parallel to the third conductive dipole arm.
8 . The antenna assembly of claim 7 , wherein the first and second conductive dipole arms are linearly polarized with respect to a first plane of polarization, wherein the third and fourth conductive dipole arms are linearly polarized with respect to a second plane of polarization, and wherein the first plane of polarization is orthogonal to the second plane of polarization.
9 . The antenna assembly of claim 1 , further comprising an integral element additively manufactured into a single continuous piece of material, the integral element including the ground plane, the first antenna element, the second antenna element, and the shorting post.
10 . The antenna assembly of claim 9 , wherein the integral element includes an electrically conductive material.
11 . The antenna assembly of claim 9 , wherein the integral element includes a non-conductive material plated with an electrically conductive material.
12 . The antenna assembly of claim 1 , further comprising an aperture configured to provide up to a 10:1 bandwidth ratio.
13 . An antenna assembly method comprising:
additively manufacturing an integral element as a single continuous piece of material, the integral element including:
an antenna feed configured to receive a signal over a wide bandwidth;
a ground plane;
a first antenna element including a first conductive dipole arm in planar alignment with a surface of the ground plane and a second conductive dipole arm in planar alignment with the surface of the ground plane and adjacent to the first conductive dipole arm;
a second antenna element including a third conductive dipole arm in planar alignment with the surface of the ground plane and adjacent to the second conductive dipole arm, and a fourth conductive dipole arm in planar alignment with the surface of the ground plane and adjacent to the third conductive dipole arm; and
a shorting post in electrical communication with the ground plane, said shorting post further being in electrical communication, by way of only the ground plane, with the second conductive dipole arm of the first antenna element and the third conductive dipole arm of the second antenna element, wherein the shorting post is adjacent to the second conductive dipole arm of the first antenna element and the third conductive dipole arm of the second antenna element; and
attaching a superstrate to the integral element;
wherein the first conductive dipole arm, second conductive dipole arm, third conductive dipole arm, and fourth conductive dipole arm extend perpendicularly from the surface of the ground plane.
14 . The antenna assembly method of claim 13 , wherein the integral element further comprises:
a first feedline in electrical communication with the first conductive dipole arm of the first antenna element and the antenna feed; and
a second feedline in electrical communication with the fourth conductive dipole arm of the second antenna element and the antenna feed.
15 . The antenna assembly method of claim 14 , wherein the integral element further comprises:
a third feedline in electrical communication with the second conductive dipole arm of the first antenna element and one of the antenna feed and the ground plane; and
a fourth feedline in electrical communication with the third conductive dipole arm of the second antenna element and one of the antenna feed and the ground plane.
16 . The antenna assembly method of claim 13 , further comprising attaching at least one non-conductive structural support element between the ground plane and the first antenna element, the second antenna element, or both.
17 . The antenna assembly method of claim 16 , wherein the at least one non-conductive structural support includes a dielectric foam or resin.
18 . The antenna assembly method of claim 13 , wherein the integral element includes an electrically conductive material.
19 . The antenna assembly method of claim 13 , wherein the integral element includes a non-conductive material plated with an electrically conductive material.
20 . The antenna assembly method of claim 13 , further comprising attaching an aperture configured to provide up to a 10:1 bandwidth ratio.