Antenna

• US 4,785,308 A
• Filed: 01/17/1986
• Issued: 11/15/1988
• 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): Sikes, William L.
• Assistant Examiner(s): Wise, Robert E.
• Application Number:
  US06/819,713
• Time in Patent Office: 1,033 Days
• Field of Search: 343/795, 343/747, 343/818
• US Class Current: 343/795
• CPC Class Codes: C08F 20/06 Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
• 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 5/335 at the feed, e.g. for impedance matching
• 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 has a triangular configuration with a central element running from the apex to the base of the triangle at a perpendicular intersection. Plural matching stubs connect from the coaxial fed apex and 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 fed and the first capacitor. A matching end can connect across the feed point at a common matching stub point for the swept elements. A plurality of apex fed opposing swept elements positioned on a boom provides a beam antenna when using a driven element and a reflector element, and additionally a director element. The antenna can operate on plural frequencies such as 20 meters, 15 meters, and 10 meters in the amateur radio spectrum or on any other frequencies in the HF or higher spectrum. An inductor and two ceramic capacitors are shunted across the 10M-15M circuitry of the driven element for 12M or 17M operation.

Claims

1. Apex feed swept antenna comprising:

a. cylindrical fiberglass support;

b. two central tubular elements telescoping over said support;

c. end elements substantially perpendicular to said central elements, and means for mechanically and electrically affixing said end elements to each end of said central element;

d. upper and lower swept elements including means for mechanically and electrically securing each of said upper and lower swept elements between ends of each of said end elements and said central elements at junction of said support;

e. spaced dielectric supports secured to each of said central elements substantially adjacent to said fiberglass support;

f. short left stub and short right stub connected to each pair of said dielectric support;

g. capacitors electrically and mechanically secured between an end of each stub and said central element;

h. first shorting bars secured to each of said central element substantially adjacent to said central element and extending downwardly;

i. a short hairpin stub and long hairpin stub connected at one end of said shorting bars;

j. second shorting bars connected between another end of said hairpin stubs and to an inner end of said left and right stubs; and

,

k. means for coupling rf power to said inner ends of said left and right stubs.

2. Antenna of claim 1 wherein said antenna resonates on 10, 15 and 20 meters.

3. Antenna of claim 2 wherein said antenna resonates on 12 meters.

4. Antenna of claim 1 including two capacitors and a coil in between and connected to a mid-portion of said short left stub.

5. Antenna of claim 1 wherein a reflector element is spaced on a boom from said apex feed swept antenna and comprises:

a. cylindrical fiberglass support;

b. two central tubular elements telescoping over said support;

c. end elements substantially perpendicular to said central elements, and means for mechanically and electrically affixing said end elements to each end of said central element;

d. upper and lower swept elements including means for mechanically and electrically securing each of said upper and lower swept elements between ends of each of said end elements and said central elements at junction of said support;

e. spaced dielectric supports secured to each of said central elements substantially adjacent to said fiberglass support;

f. a stub connected between each pair of said dielectric support;

g. capacitors electrically and mechanically secured between an end of each stub and said central element;

h. first shorting bars secured to each of said central element substantially adjacent to said central element and extending downwardly;

i. a short hairpin stub and long hairpin stub connected at one end of said shorting bars; and

,

j. second shorting bars connected between another end of said hairpin stubs and to an inner end of said left and right stubs.