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ANTENTOP- 01-2011
Antenna Theory
1
Cylindrical Antennas - Classical Theoretical Models: by: Prof. Natalia K. Nikolova
5-24
Dear friends, I would like to give to you an interesting and reliable antenna theory. Hours searching in the web gave me lots theoretical information about antennas. Really, at first I did not know what information to chose for ANTENTOP.
Now I want to present to you one more very interesting Lecture - it is LECTURE 9: Cylindrical Antennas - Classical Theoretical Models.
Reciprocity theorem. Self-impedance
of a dipole using the induced emf
method. Pocklington's equation. Hallen's equation...
HF- Antenna Practice
2
Super Broad Band HF- VHF Antenna: Igor Lavrushov, UA6HJQ
25- 27
I desperately need in RX/TX antenna that could be work at HF- VHF bands without any tuning. The antenna should be work at any conditional and should be simple in design. Below you find description of my design of such antenna...
3
Vertical for the 20- meter Band: by: Boris Krivosheev (R9WI ex RA9WFD)
28- 29
4
Helical Antenna for 20 meters Band: by: Vladimir Semenov (RU4SJ)
30
5
Urban Antenna:by: Vladimir Semenov (RU4SJ)
31- 32
I have to use the antenna with a transceiver with RF- power 87- Wtts. Antenna was installed at a balcony in the second store of a multi- store building. Direction of the balcony is to the South. Antenna was tested at 80, 40 and 20- meter Band...
6
Cylindrical
EH- antenna
for the 20- meter Band: by: Vladimir Semenov (RU4SJ)
33- 34
7
Multiband Vertical Stub Antennas: by: Roman Sergeev (RN9RQ)
35- 37
The question was- what should be the antennas like?
8
Asymmetrical Trap Dipole Antenna: by: Roman Sergeev (RA9QCE)
38- 39
Ham knows and widely used to the Symmetrical Trap Dipole Antennas. Classical example of such antenna is W3DZZ antenna. At my opinion such antennas has just one benefit- patterns of the antennas are almost the same at the different bands. However, the antennas have lots disadvantages. There are heavy weight, complexity in design, large enough windage, the narrow bandwidth at the lower bands, high SWR at some bands.
Asymmetrical Dipole Antennas (that are used by hams) are free from some
of lacks of the Symmetrical Trap Dipole Antennas. However the main lack
of the Asymmetrical Dipole Antennas is the main lobe of the diagram directivity
at lower bands is toward to main lobes at the other upper bands.
An antenna that is almost free from the disadvantages was design by me
by combination of these two types of antennas- Symmetrical Dipole Antennas
and Asymmetrical Dipole Antennas. I called the new one prototype "Asymmetrical
Trap Dipole Antenna."
9
Vertical Open Stub Antenna for the 40 and 20- meter Band: by: Nikolay Kudryavchenko, UR0GT
40- 42
10
Wire Antennas for the 160 and 80 meters: by: Nikolay Kudryavchenko, UR0GT
43- 48
11
MOXON for 15 and 10- meter Bands: by: Nikolay Kudryavchenko, UR0GT
49-51
12
AN
Antenna “Strela”: by: UA4SZ Valery Kiselev
52- 55
Antenna Strela (in transcription from Russian it means “Arrow”) is a modification of the well-known dipole antenna Bazooka that is widely used by hams.
However antenna Strela is contained less stuff for manufacture, antenna Strela is lighter then antenna Bazooka. Antenna Strela has good matching with the coaxial cable and SWR of the antenna on the working Band looks like better then Bazooka could provide there...
13
Efficient
Field Low Height Dipole Antenna
for the 20- meter Band: by:
Igor Lavrushov, UA6HJQ
56- 59
VHF- UHF- Antennas
14
YAGI for 145.5- MHz: by: Valery Kiselyov (UA4SZ)
60
15
145- MHz J- Antenna with no- Mast RF Current: by: Nikolay Kudryavchenko, UR0GT
61- 66
Fuchs Antenna for the 2- meter Band: by: Vasily Perov DL1BA (ex UK8BA)
67
17
Low Profile Antennas for the 435- MHz Band: By: Nikolay Kudryavchenko, UR0GT
68- 74
145/435- MHz Vertical Dipole Antenna: By: Nikolay Kudryavchenko, UR0GT
19
HISTORY
20
Regenerative HF- Receiver of the Beginner Radio Amateur: by: L. Nikolaev, Radio #2, 1958, pp.: 20- 23
79- 82
Underground Antennas of the Military Radio Center and Missile Silo: Credit Line: Forum at www.cqham.ru
Wish You Were There... Hamvention- 2011 and FDIM- 2011
PATENTS
23
Stub Matched Antenna and Method the Feeding Same
90- 97
Sound Powered Radio Transmitter
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Last update: February 4, 2018 19:54