IP Library › Granted Patent US 12676416
Granted Patent B1
US 12676416 · App. 18/633,951 · Granted Jul 7, 2026

Impedance tunable folded dipole antenna

Inventors: Yong Jae Lee (Blue Bell, PA); Timothy James White (Oreland, PA); Michael A. Matsick (Coopersburg, PA)
Assignee: CAES Systems LLC
H01Q9/26H01Q9/0442
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Quick Facts
Patent No.
US 12676416
App. No.
18/633,951
Granted
Jul 7, 2026
Kind
B1
Abstract

Apparatuses, systems, and methods for a folded dipole antenna are provided. A folded dipole antenna may include a radiating element with a first side and a second side and a RF feed. The first side of the radiating element may include a first portion, a second portion, and a first fold between this first portion and this second portion. The second side of the radiating element may include a first portion, a second portion, and a second fold between this first portion and this second portion. The first portion of the first side and the first portion of the second side have a first diameter that is different from the second portion of the first side and the second portion of the second side have a second diameter. The folded dipole antenna may also include one or more tuning bars.

Claims (57)

1 . A folded dipole antenna comprising:

a radiating element comprised of a first side and a second side;

a RF feed located between the first side of the radiating element and the second side of the radiating element;

wherein the first side of the radiating element is comprised of a first portion of the first side having a first length, a second portion of the first side having a second length, and a first fold having a first fold length between the first portion of the first side and the second portion of the first side;

wherein the second side of the radiating element is comprised of a first portion of the second side having a third length, a second portion of the second side having a fourth length, and a second fold having a second fold length between the first portion of the second side and the second portion of the second side;

wherein the first portion of the first side has a first diameter for the first length, and wherein the first portion of the second side has the first diameter for the second length;

wherein the second portion of the first side has a second diameter for the second length, and wherein the second portion of the second side has the second diameter for the fourth length, and

wherein the first diameter is different than the second diameter;

wherein the first fold has a fifth diameter for the first fold length and wherein the second fold has a sixth diameter for the second fold length;

a first tuning bar located between the first portion of the first side and the second portion of the first side; and

a second tuning bar located between the first portion of the second side and the second portion of the second side.

2 . The folded dipole antenna of claim 1 , wherein the first tuning bar is comprised of a first stub of the first tuning bar and a second stub of the first tuning bar separate by a first stub gap; and wherein second tuning bar is comprised of a first stub of the second tuning bar and a second stub of the second tuning bar separate by a second stub gap.

3 . The folded dipole antenna of claim 2 , wherein the first stub of the first tuning bar and the second stub of the first tuning bar share an axis, and the first stub of the second tuning bar and the second stub of the second tuning bar share an axis.

4 . The folded dipole antenna of claim 2 , wherein the first stub of the first tuning bar has a first central axis and the second stub of the first tuning bar has a second central axis, the first central axis being different than the second central axis.

5 . The folded dipole antenna of claim 1 , wherein the first tuning bar is a solid tuning bar, and the second tuning bar is a solid tuning bar.

6 . The folded dipole antenna of claim 1 , wherein the first tuning bar has a third diameter, the second tuning bar has a fourth diameter, and the third diameter is different than the fourth diameter.

7 . The folded dipole antenna of claim 1 , wherein the first tuning bar is located a first distance from the first fold, the second tuning bar is located a second distance from the second fold, and wherein the first distance and the second distance are the same.

8 . The folded dipole antenna of claim 1 , wherein the first tuning bar is located a first distance from the first fold, the second tuning bar is located a second distance from the second fold, and wherein the first distance and the second distance are different.

9 . The folded dipole antenna of claim 1 , wherein the second portion of the first side of the radiating element is terminated with a first terminating impedance and the second portion of the second side is terminated with a second terminating impedance.

10 . The folded dipole antenna of claim 1 further comprising a third tuning bar.

11 . A method comprising:

providing a folded dipole antenna, wherein the folded dipole antenna comprises:

a radiating element comprised of a first side and a second side;

a RF feed located between the first side of the radiating element and the second side of the radiating element;

wherein the first side of the radiating element is comprised of a first portion of the first side having a first length, a second portion of the first side having a second length, and a first fold having a first fold length between the first portion of the first side and the second portion of the first side;

wherein the second side of the radiating element is comprised of a first portion of the second side having a third length, a second portion of the second side having a fourth length, and a second fold having a second fold length between the first portion of the second side and the second portion of the second side;

wherein the first portion of the first side has a first diameter for the first length, and wherein the first portion of the second side has the first diameter for the second length;

the second portion of the first side has a second diameter for the second length, and wherein the second portion of the second side has the second diameter for the fourth length;

wherein the first diameter is different than the second diameter;

wherein the first fold has a fifth diameter for the first fold length and wherein the second fold has a sixth diameter for the second fold length;

a first tuning bar located between the first portion of the first side and the second portion of the first side;

a second tuning bar located between the first portion of the second side and the second portion of the second side;

receiving a first signal via the RF feed; and

generating a first electromagnetic signal with the folded dipole antenna based on the first signal.

12 . The method of claim 11 , wherein the first tuning bar is comprised of a first stub of the first tuning bar and a second stub of the first tuning bar separate by a first stub gap; and wherein second tuning bar is comprised of a first stub of the second tuning bar and a second stub of the second tuning bar separate by a second stub gap.

13 . The method of claim 11 , wherein the first tuning bar has a third diameter, the second tuning bar has a fourth diameter, and the third diameter is different than the fourth diameter.

14 . The method of claim 11 , wherein the first tuning bar is located a first distance from the first fold, the second tuning bar is located a second distance from the second fold, and wherein the first distance and the second distance are the same.

15 . The method of claim 11 , wherein the second portion of the first side of the radiating element is terminated with a first terminating impedance and the second portion of the second side is terminated with a second terminating impedance.

16 . A method comprising:

providing a folded dipole antenna, wherein the folded dipole antenna comprises:

a radiating element comprised of a first side and a second side;

a RF feed located between the first side of the radiating element and the second side of the radiating element;

wherein the first side of the radiating element is comprised of a first portion of the first side having a first length, a second portion of the first side having a second length, and a first fold having a first fold length between the first portion of the first side and the second portion of the first side;

wherein the second side of the radiating element is comprised of a first portion of the second side having a third length, a second portion of the second side having a fourth length, and a second fold having a second fold length between the first portion of the second side and the second portion of the second side;

wherein the first portion of the first side has a first diameter for the first length, and wherein the first portion of the second side has the first diameter for the second length;

wherein the second portion of the first side has a second diameter for the second length, and wherein the second portion of the second side has the second diameter for the fourth length;

wherein the first diameter is different than the second diameter;

wherein the first fold has a fifth diameter for the first fold length and wherein the second fold has a sixth diameter for the second fold length;

a first tuning bar located between the first portion of the first side and the second portion of the first side;

a second tuning bar located between the first portion of the second side and the second portion of the second side;

receiving a first electromagnetic signal with the folded dipole antenna;

generating a first signal with the folded dipole antenna based on the first electromagnetic signal; and

transmitting the first signal via the RF feed.

17 . The method of claim 16 , wherein the first tuning bar is comprised of a first stub of the first tuning bar and a second stub of the first tuning bar separate by a first stub gap; and wherein second tuning bar is comprised of a first stub of the second tuning bar and a second stub of the second tuning bar separate by a second stub gap.

18 . The method of claim 16 , wherein the first tuning bar has a third diameter, the second tuning bar has a fourth diameter, and the third diameter is different than the fourth diameter.

19 . The method of claim 16 , wherein the first tuning bar is located a first distance from the first fold, the second tuning bar is located a second distance from the second fold, and wherein the first distance and the second distance are the same.

20 . The method of claim 16 , wherein the second portion of the first side of the radiating element is terminated with a first terminating impedance and the second portion of the second side is terminated with a second terminating impedance.