US2359620A - Short wave antenna - Google Patents
Short wave antenna Download PDFInfo
- Publication number
- US2359620A US2359620A US446873A US44687342A US2359620A US 2359620 A US2359620 A US 2359620A US 446873 A US446873 A US 446873A US 44687342 A US44687342 A US 44687342A US 2359620 A US2359620 A US 2359620A
- Authority
- US
- United States
- Prior art keywords
- transmission line
- short wave
- antenna
- wave antenna
- plates
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000004020 conductor Substances 0.000 description 19
- 230000005540 biological transmission Effects 0.000 description 18
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
- H01Q9/28—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
Definitions
- the present invention relates to short wave antennas and has for its primary object the provision of a short wave antenna which presents a negligible reactance at its terminals over a wide range frequency such as may be required in television transmission or reception.
- a wide band of frequencies is used, as in the transmission of television programs, it is desirable that the antenna act as a substantially pure resistance of substantially constant magnitude over a wide range of frequencies in order to prevent the occurrence of standing waves along the feeder.
- the standing waves are an indication of reflection of energy back into the transmission line from the antenna. Such reflections cause variations in the input impedance of the transmission line and increased losses in the transmission line.
- the present invention provides a highly desirable type of short wave antenna for use over a wide frequency range, the antenna causing very little reactance variation in the transmission line with a variation in frequency.
- the antenna of the present invention comprises a pair of conducting surfaces in the form of flat discs arranged coaxially and in parallel planes.
- the discs are preferably energized at the centers of their facing surfaces.
- the radii of the conducting plates and the diameter of the conductors to which the transmission line conductors are connected are so proportioned with respect to the wavelength to be employed that a broad frequency characteristic is attained,
- the antenna shown in Figure 1 is composed of a pair of flat circular plates I and I2 coaxially disposed in parallel planes.
- the radius of the plates I0 and I2 is chosen as .1103 where i is the operating wavelength of the antennas, in one particular case, 150 centimeters.
- the axis of the antenna may be assumed to be vertical for radiating uniformly in a horizontal plane. Of course, if horizontally polarized radiation and some horizontal directivity is desired, the axis may be horizontally arranged.
- the antenna is coupled to a frequency transducer means (not shown), such as a radio transmitter, by means of transmission line TL having its conductors connected to the centers of plates ill and I2 through intermediary conductors II and l3 of somewhat larger diameter than the diameter of the conductors of the transmission line.
- a frequency transducer means such as a radio transmitter
- transmission line TL having its conductors connected to the centers of plates ill and I2 through intermediary conductors II and l3 of somewhat larger diameter than the diameter of the conductors of the transmission line.
- the diameter of conductors H and I3 was chosen as .25 centimeter.
- the modification shown in Figure 2 is similar to that shown in Figure 1, with the exception that the transmission line TL is, in this modification, a concentric line having its central concluctor l4 connected to conductor H and passing through a hollow conductor l3.
- the casing l5 of the transmission line forms an extension of conductor l3 below the plate [2.
- This embodiment has some advantages over that shown in Figure 1 because the structure is entirely symmetrical, the transmission line leading away from the antenna along its vertical axis of symmetry. Thus, any disturbance of the radiated field pattern by the transmission line is avoided.
- the curves shown in Figure 3 illustrate the variations in voltage and current along the surface of plates Ill and I2 with varying distance r from the center, as indicated by the point I6 in Figure 1.
- the curves in Figure 3 plot voltage and current against varying values of r/x where r is the radial distance between the center of plate In and point 16.
- a short wave antenna including a pair of flat conductive plates coaxially arranged in parallel planes and a, two conductor substantially aperiodic transmission line and means for coupling said transmission line to said plates at substantially the midpoints of their facing surfaces, said means including a pair of coaxially arranged conductors, each connected at one end to the midpoints of one of said plates, the other ends of said conductors being connected to the conductors of said-transmission line, the dimensions of said plates and said conductors being so proportioned that over a broad frequency band said antenna appears to said transmission line as a substantially pure resistance of substantially constant magnitude.
- a short wave antenna including a pair of flat conductive plates coaxially arranged in parallel planes and a coaxial transmission line having an inner conductor and an outer shell, said shell being connected to and extending through one of said plates at its center, said inner conductor being connected to the center of the other of said plates through a short section of conductor having a diameter substantially equal to that of said outer shell, the dimensions of said plates and said conductors being so proportioned that a broad frequency band is obtained.
- a short wave antenna including a pair of flat conductive plates coaxially arranged in parallel planes and a coaxial transmission line having an inner conductor and an outer shell, said
Description
Oct. 3, 1944. Rs. CARTER SHORT WAVE ANTENNA Filed June 13, 1942 wmmmu M65 3; mo 35 3 witQw INVENTOR Z CARTER. 7/6
ATTO R N EY Patented Oct. 3, 1944 SHORT WAVE ANTENNA Philip S. Carter, Rocky Point, N. Y., assignor to Radio Corporation of America, a corporation of Delaware Application June 13, 1942, Serial No. 446,873
3 Claims.
The present invention relates to short wave antennas and has for its primary object the provision of a short wave antenna which presents a negligible reactance at its terminals over a wide range frequency such as may be required in television transmission or reception. When a wide band of frequencies is used, as in the transmission of television programs, it is desirable that the antenna act as a substantially pure resistance of substantially constant magnitude over a wide range of frequencies in order to prevent the occurrence of standing waves along the feeder. The standing waves are an indication of reflection of energy back into the transmission line from the antenna. Such reflections cause variations in the input impedance of the transmission line and increased losses in the transmission line.
The present invention provides a highly desirable type of short wave antenna for use over a wide frequency range, the antenna causing very little reactance variation in the transmission line with a variation in frequency.
In principle, the antenna of the present invention comprises a pair of conducting surfaces in the form of flat discs arranged coaxially and in parallel planes. The discs are preferably energized at the centers of their facing surfaces. The radii of the conducting plates and the diameter of the conductors to which the transmission line conductors are connected are so proportioned with respect to the wavelength to be employed that a broad frequency characteristic is attained,
The present invention will be more fully understood by reference to the following detailed description which is accompanied by a drawing in which Figure 1 illustrates an embodiment of the present invention, Figure 2 illustrates a modification of the form shown in Figure 1, and Figure 3 illustrates by means of curves some of the features of the present invention.
The antenna shown in Figure 1 is composed of a pair of flat circular plates I and I2 coaxially disposed in parallel planes. In the particular embodiment disclosed, the radius of the plates I0 and I2, is chosen as .1103 where i is the operating wavelength of the antennas, in one particular case, 150 centimeters. In the particular embodiment shown the axis of the antenna may be assumed to be vertical for radiating uniformly in a horizontal plane. Of course, if horizontally polarized radiation and some horizontal directivity is desired, the axis may be horizontally arranged. The antenna is coupled to a frequency transducer means (not shown), such as a radio transmitter, by means of transmission line TL having its conductors connected to the centers of plates ill and I2 through intermediary conductors II and l3 of somewhat larger diameter than the diameter of the conductors of the transmission line. In the particular example embodiment mentioned above, the diameter of conductors H and I3 was chosen as .25 centimeter.
The modification shown in Figure 2 is similar to that shown in Figure 1, with the exception that the transmission line TL is, in this modification, a concentric line having its central concluctor l4 connected to conductor H and passing through a hollow conductor l3. The casing l5 of the transmission line forms an extension of conductor l3 below the plate [2. This embodiment has some advantages over that shown in Figure 1 because the structure is entirely symmetrical, the transmission line leading away from the antenna along its vertical axis of symmetry. Thus, any disturbance of the radiated field pattern by the transmission line is avoided.
The curves shown in Figure 3 illustrate the variations in voltage and current along the surface of plates Ill and I2 with varying distance r from the center, as indicated by the point I6 in Figure 1. The curves in Figure 3 plot voltage and current against varying values of r/x where r is the radial distance between the center of plate In and point 16.
While I have particularly shown and described several modifications of my invention, it is to be distinctly understood that my invention is not limited thereto but that improvements within the scope of the invention may be made.
I claim:
1. A short wave antenna including a pair of flat conductive plates coaxially arranged in parallel planes and a, two conductor substantially aperiodic transmission line and means for coupling said transmission line to said plates at substantially the midpoints of their facing surfaces, said means including a pair of coaxially arranged conductors, each connected at one end to the midpoints of one of said plates, the other ends of said conductors being connected to the conductors of said-transmission line, the dimensions of said plates and said conductors being so proportioned that over a broad frequency band said antenna appears to said transmission line as a substantially pure resistance of substantially constant magnitude.
2. A short wave antenna including a pair of flat conductive plates coaxially arranged in parallel planes and a coaxial transmission line having an inner conductor and an outer shell, said shell being connected to and extending through one of said plates at its center, said inner conductor being connected to the center of the other of said plates through a short section of conductor having a diameter substantially equal to that of said outer shell, the dimensions of said plates and said conductors being so proportioned that a broad frequency band is obtained.
3. A short wave antenna including a pair of flat conductive plates coaxially arranged in parallel planes and a coaxial transmission line having an inner conductor and an outer shell, said
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US446873A US2359620A (en) | 1942-06-13 | 1942-06-13 | Short wave antenna |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US446873A US2359620A (en) | 1942-06-13 | 1942-06-13 | Short wave antenna |
Publications (1)
Publication Number | Publication Date |
---|---|
US2359620A true US2359620A (en) | 1944-10-03 |
Family
ID=23774136
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US446873A Expired - Lifetime US2359620A (en) | 1942-06-13 | 1942-06-13 | Short wave antenna |
Country Status (1)
Country | Link |
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US (1) | US2359620A (en) |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2519209A (en) * | 1945-03-30 | 1950-08-15 | Hazeltine Research Inc | Antenna |
US2532919A (en) * | 1947-04-21 | 1950-12-05 | Johnson William Arthur | Radio aerial system, and particularly directive aerial system |
US2541037A (en) * | 1946-04-19 | 1951-02-13 | Standard Telephones Cables Ltd | Antenna |
US2566491A (en) * | 1946-03-15 | 1951-09-04 | Belmont Radio Corp | Antenna construction |
US2567220A (en) * | 1947-10-29 | 1951-09-11 | Sperry Corp | Scalloped limacon pattern antenna |
US2636123A (en) * | 1945-09-17 | 1953-04-21 | Thure E Hanley | Electromagnetic shielding apparatus |
US2774967A (en) * | 1949-11-19 | 1956-12-18 | Int Standard Electric Corp | Balanced doublet antenna of small dimension |
US2939143A (en) * | 1953-10-29 | 1960-05-31 | Sadir Carpentier | Wide band dipole antenna |
US3432858A (en) * | 1964-12-14 | 1969-03-11 | Allan R Brown | Short dipole antenna |
US3568206A (en) * | 1968-02-15 | 1971-03-02 | Northrop Corp | Transmission line loaded annular slot antenna |
US3827053A (en) * | 1970-07-23 | 1974-07-30 | E Willie | Antenna with large capacitive termination and low noise input circuit |
WO1982000735A1 (en) * | 1980-08-22 | 1982-03-04 | Co Boeing | Decoupling means for monopole antennas and the like |
US4675691A (en) * | 1985-05-23 | 1987-06-23 | Moore Richard L | Split curved plate antenna |
WO1989007348A1 (en) * | 1988-02-02 | 1989-08-10 | Maurice Clifford Hately | Radio antennas |
AU626210B2 (en) * | 1988-02-02 | 1992-07-23 | Maurice Clifford Hately | Radio antennas |
US5347291A (en) * | 1991-12-05 | 1994-09-13 | Moore Richard L | Capacitive-type, electrically short, broadband antenna and coupling systems |
DE4310532A1 (en) * | 1993-03-31 | 1994-10-06 | Rohde & Schwarz | Push-pull amplifier for an active dipole antenna |
USD420359S (en) * | 1998-08-26 | 2000-02-08 | Allis Communications, Co., Ltd. | Antenna |
EP1391009A1 (en) * | 2000-04-14 | 2004-02-25 | Gregory Daniel Hall | Plate dipole antenna |
-
1942
- 1942-06-13 US US446873A patent/US2359620A/en not_active Expired - Lifetime
Cited By (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2519209A (en) * | 1945-03-30 | 1950-08-15 | Hazeltine Research Inc | Antenna |
US2636123A (en) * | 1945-09-17 | 1953-04-21 | Thure E Hanley | Electromagnetic shielding apparatus |
US2566491A (en) * | 1946-03-15 | 1951-09-04 | Belmont Radio Corp | Antenna construction |
US2541037A (en) * | 1946-04-19 | 1951-02-13 | Standard Telephones Cables Ltd | Antenna |
US2532919A (en) * | 1947-04-21 | 1950-12-05 | Johnson William Arthur | Radio aerial system, and particularly directive aerial system |
US2567220A (en) * | 1947-10-29 | 1951-09-11 | Sperry Corp | Scalloped limacon pattern antenna |
US2774967A (en) * | 1949-11-19 | 1956-12-18 | Int Standard Electric Corp | Balanced doublet antenna of small dimension |
US2939143A (en) * | 1953-10-29 | 1960-05-31 | Sadir Carpentier | Wide band dipole antenna |
US3432858A (en) * | 1964-12-14 | 1969-03-11 | Allan R Brown | Short dipole antenna |
US3568206A (en) * | 1968-02-15 | 1971-03-02 | Northrop Corp | Transmission line loaded annular slot antenna |
US3827053A (en) * | 1970-07-23 | 1974-07-30 | E Willie | Antenna with large capacitive termination and low noise input circuit |
WO1982000735A1 (en) * | 1980-08-22 | 1982-03-04 | Co Boeing | Decoupling means for monopole antennas and the like |
US4342037A (en) * | 1980-08-22 | 1982-07-27 | The Boeing Company | Decoupling means for monopole antennas and the like |
US4675691A (en) * | 1985-05-23 | 1987-06-23 | Moore Richard L | Split curved plate antenna |
WO1989007348A1 (en) * | 1988-02-02 | 1989-08-10 | Maurice Clifford Hately | Radio antennas |
JPH03502752A (en) * | 1988-02-02 | 1991-06-20 | ヘイトリー,モーリス,クリフオード | wireless antenna |
AU626210B2 (en) * | 1988-02-02 | 1992-07-23 | Maurice Clifford Hately | Radio antennas |
US5347291A (en) * | 1991-12-05 | 1994-09-13 | Moore Richard L | Capacitive-type, electrically short, broadband antenna and coupling systems |
DE4310532A1 (en) * | 1993-03-31 | 1994-10-06 | Rohde & Schwarz | Push-pull amplifier for an active dipole antenna |
USD420359S (en) * | 1998-08-26 | 2000-02-08 | Allis Communications, Co., Ltd. | Antenna |
EP1391009A1 (en) * | 2000-04-14 | 2004-02-25 | Gregory Daniel Hall | Plate dipole antenna |
EP1391009A4 (en) * | 2000-04-14 | 2004-12-22 | Gregory Daniel Hall | Plate dipole antenna |
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