Multi-band dipole antenna with matching stubs

• US 4,593,289 A
• Filed: 04/18/1983
• Issued: 06/03/1986
• Est. Priority Date: 04/18/1983
• Status: Expired due to Fees

• Current Assignee: Butternut Electronics Company
• Original Assignee: Butternut Electronics Company
• Inventors: Newcomb, Donald R.
• Primary Examiner(s): Lieberman, Eli
• Assistant Examiner(s): Wimer, Michael C.
• Application Number:
  US06/485,875
• Time in Patent Office: 1,142 Days
• Field of Search: 343/795, 343/803, 343/806-809, 343/831, 343/722, 343/745, 343/747, 343/748, 343/749, 343/817-819, 343/750, 343/810, 343/825, 343/826, 343/834
• US Class Current: 343/795
• CPC Class Codes: H01Q 1/1228 on a boom
• CPC Class Codes: H01Q 19/30 the primary active element being centre-fed and substantially straight, e.g. Yagi antenna
• CPC Class Codes: H01Q 5/321 within a radiating element or between connected radiating elements
• CPC Class Codes: H01Q 9/28 Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines waveguide horns or mouths H01Q13/00; slot antennas H01Q13/00
• CPC Class Codes: H01Q 9/44 with a plurality of divergent straight elements, e.g. V-dipole, X-antenna; with a plurality of elements having mutually inclined substantially straight portions combinations of two or more active elements H01Q21/00; turnstile antennas H01Q21/26

Abstract

Antenna for operation on a plurality of frequencies, the antenna including apex fed opposing swept elements and a plurality of stubs parallel to a central element, a plurality of capacitors connected between one end of the central element and ends of the stubs, and a coaxial cable connected to the opposing swept elements. Each swept element is of a triangular configuration with a central element running from the apex to the base of the triangle at a substantially perpendicular intersection. A plurality of matching stubs connect from the coaxial fed apex and substantially parallel along the central tube, secured at the other end with clamps or capacitors. Ceramic doorknob capacitors connect between the coaxial fed apex and a free end of the first stub and between the first and second stub ends. A hairpin coil can be utilized between the apex feed and the first capacitor, providing required circuit Q. A matching end can connect across the feedpoint at a common matching stub point for the swept elements. A plurality of apex fed opposing swept elements positioned on a boom and supported by a mast provides a beam antenna when using a driven element and a reflector element, and additionally a director element as desired. The antenna can be structured to operate on a plurality of frequencies such as 20 meters, 15 meters and 10 meters in the amateur radio spectrum or on any other frequencies as desired in the HF or higher spectrum.

Claims

1. Apex fed opposing swept element antenna including:

a. cylindrical fiberglass support;

b. two central tubular elements telescoping over said support;

c. end elements substantially perpendicular to said central elements and mechanically and electrically affixed to ends of said central elements;

d. upper and lower swept elements including securing means for mechanically and electrically connecting each of said upper and lower swept elements between each of said end elements and said central elements at a junction at said support, end to end separation of said central tubular elements being less than one-half wavelength; and

,

e. at least one stub means parallel to each of said central elements and electrically connected at each end of said stub means to each of said central elements and at a junction of said central elements.

2. Antenna of claim 1 wherein said stub means comprises at least one lower opposing stub positioned substantially parallel to a portion of said central elements, clamps connected between outer ends of said stub and a mid-portion of each of said central elements, an inductor-capacitor means connected between inner ends of said stub and inner ends of said central elements, and coaxial cable connected to a lower point of said inductor-capacitor means.

3. Antenna of claim 1 wherein said stub means comprises opposing first stubs positioned substantially parallel to a portion of said central elements, a shorting clamp connected between outer ends of said stubs and a mid-portion of said central elements, an inductor-capacitor means connected between inner ends of said stubs and inner ends of said central elements, and second opposing stubs positioned substantially parallel and below and shorter in length with respect to said first opposing stubs, a shorting clamp connected between inner ends of said first stubs and said second stubs, a capacitor means connected between substantially outer ends of said first and second stubs, and coaxial cable connected between a lower point of said inductor-capacitor means and the junction of said inner ends of said first and second stubs.

4. Antenna of claim 3 wherein said antenna is resonant on 10 meters, 15 meters and 20 meters.

5. Antenna of claim 3 wherein said inductor-capacitor means comprises a ceramic tubular capacitor and a coil.

6. Antenna of claim 5 wherein said coil comprises a hairpin inductor.

7. Antenna of claim 6 wherein said hairpin inductor comprises a loop of wire approximately eight inches long.

8. Antenna of claim 1 including a matching inductor connected across said feedpoint.

9. Antenna of claim 4 comprising a driven element and a reflector element spaced with respect to each other.

10. Antenna of claim 1 wherein said upper and lower elements are equiangular.

11. Antenna of claim 3 wherein said antenna is resonant on 12, 15, and 20 meters.

12. Apex fed opposing swept dipole element antenna including a cylindrical fiberglass rod support, a right and left central tubular element extending telescoped thereover and therefrom and secured thereto with nut-and-bolt assemblies, a right end tubular rod element and a left end tubular rod element secured at substantially a right angle to the outer ends of each of said central tubular elements and secured thereto with a nut-and-bolt assembly, upper and lower right swept rod elements and upper and lower left swept rod elements, each of said end rod elements and said swept elements being continuous, a clamp securing inner ends of the swept rod elements to an inner end of said central tubular element adjacent to said fiberglass rod support with a clamp and nut-and-bolt assembly, upper left and right first stubs, upper left and right shorting clamps at outer ends of said first stubs and secured between said outer ends of said first stubs and to a mid-portion of each of said central tubular elements with nut-and-bolt assemblies, right and left dielectric supports securing and supporting inner ends of said first stubs to an inner end of said central tubular element and secured thereto with clamps and nut-and-bolt assemblies, right and left tubular ceramic capacitor secured along with an inductance coil between and electrically connected to the inner end of said central tubular element and said inner end of said first stubs, and lower second right and left stubs, clamps between each inner end of said second stubs and said inner end of said first stubs, and right and left capacitors connected with wrap-around clamps and nut-and-bolt assemblies to outer ends of said right and left first and second stubs with bolts securing each of said capacitors to lips of said clamps, and a coaxial feedline including an impedance matching coil connected between feedpoints of said inner ends of said left and right first and second stubs.

13. Antenna of claim 12 further comprising a driven element and at least one other element spaced on a boom.

14. Antenna of claim 12 further comprising a driven element, a reflector element, and a director element, each formed from said apex fed opposing swept dipole element, and said driven element, said reflector element and said director element spaced and mounted on a boom.

15. Antenna of claim 14 wherein said elements operate on 14 MHz, 21 MHz, and 28 MHz.