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ANTENTOP- 01-2009

 

 

 

 

 

 
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Antenna Theory

 

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1

 

Aperture Antennas - Part I : by: Prof. Natalia K. Nikolova

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 a Lecture Aperture Antennas - Part I. I believe, you cannot find such info anywhere for free! Very interesting and very useful info for every ham, for every radio- engineer.

The uniqueness theorem. The equivalence principle. The application of
the equivalence principle to aperture problem. The uniform rectangular
aperture. The tapered rectangular aperture.


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HF- Antenna Practice

 

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Compact Cage Antenna: by: Vladislav Shcherbakov, RU3ARJ

Everyone knows "classical" quad antenna. Its perimeter is equal to wavelength. Each side of the quad is 1/4 wavelength. Amplification of the "classical" quad antenna is 3-dBi, input impedance (in a free space) is close to 120-Ohm. Good antenna but the size!

It is possible to reduce its size by folding it in a "cage" shape…


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Antennas by Nikolay Kudryavchenko, UR0GT

Antentop (from the issue) begin to publish antennas designed by Nick Kudryavchenko, UR0GT. No changes (compare to previous their publishing in the Internet) are added to the description and MMANA files of the antennas.

Some words about the history of the publication....



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DEWD Vertical for the 80- meters: by: Nikolay Kudryavchenko, UR0GT

Variant of a DEWD Vertical Antenna for 3.5 - 4.0


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DEWD Dipole Antenna for the 80- meters: by: Nikolay Kudryavchenko, UR0GT

Variant of a DEWD Dipole Antenna for 3.5 - 4.0


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DEWD I.V. for the 80- meters: by: Nikolay Kudryavchenko, UR0GT

Variant of a DEWD I.V. Antenna for 3.5 - 4.0


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DEWD Broadband YAGI Antenna for the 80- m:
by: Nikolay Kudryavchenko, UR0GT


Variant of a DEWD YAGI Antenna for 3.5 - 4.0


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Top Fed Five Band Vertical Antenna: By: Yuri Medinets, UB5UG

It is a simple solution increase the efficiency of a vertical antenna. Just to remove all high currents parts of the antenna from ground. The losses at nearby subjects are decrease and the overall performance of the antenna increase. So, we come to a Top Fed Vertical Antenna.

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Russian Military Antennas. Some Data

Russian Military Antennas. Some Data


 

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Small Sized Helical Antennas: By: I. Kapustin, UA0RW, Yakutsk, USSR

Three practical design of the Helical HF Antennas from far 50s


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Receiving Antennas

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Fire Antenna: By: Vladimir Polaykov, RA3AAE

Once Friday's day I was busy at my cottage with some deals to do. My backyard was pile- upped with dry logs and branches. I made a fire in an old rim from a truck. Looking at the smoke going to the night sky, I remembered, about smoke that could improve receiving. I had a multimeter M830B and detector receiver. So, I decided to make an experiment.


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UHF Antennas

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Compact Cage Antenna for 435 MHz: by: Vladislav Shcherbakov, RU3ARJ

In article "Compact Cage Antenna" was discussed CCA for HF- ranges. However, that kind antenna may be used for UHF-ranges. At the article it discussed a CCA for 435 MHz.

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VHF Antennas

 

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Broadband Avia Antenna (DEWD)
by: Nikolay Kudryavchenko, UR0GT

The antenna has SWR less the 2.0:1.0 at the frequencies from 112 up to 165- MHz. Gain and pattern belong to the antenna are almost similar to a vertical lambda/2 dipole. The antenna has three resonance frequencies at the working band (112- 165- MHz). It explains why the antenna is such broadband.


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4- Elements Directional Broadband Avia Antenna
by: Nikolay Kudryavchenko, UR0GT


A variant Broadband Avia Antenna that has directivity due reflector and director.


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UHF Antennas

 

 

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Bi- Quad Antenna for 2420- MHz
by: Nikolay Kudryavchenko, UR0GT

Just a simple antenna for 2420- MHz


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Universal RF Amplifier of a QRP- Transceiver: By: Igor Grigorov, UZ3ZK

QRP design- it is very specific design, where ham wants to use as little parts as possible. The amplifier gives the possibility because it can be used twice- like RF- PA and like RF- RX- Amplifier.


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QRP- Transceivers

 

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Transceiver "POLEVIK"
By: Vladimir Polaykov, RA3AAE

The schematic of the transceiver is just a project and required the practical test. Author will be really appreciated those who test the transceiver.


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Tube AM Radio Station for the 160- meters
By: Igor Grigorov, RK3ZK

Simple Radio Station that was tried by UA3ZNW/RK3ZK in the end of 80s - beginning 90s.


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QRPP/QRP Transceiver by UB5UG
By: Yuri Medinets, UB5UG, Kiev

Simple, easy to- make QRPP/QRP CW- Transceiver for 10- meters...

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Free E- Books

 

 
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"Antennas" by Sergey Nadenenko


I'm pleased to announce the famous in ex- USSR book "Antennas" by S. Nadenenko. The book was published at 1959 in limited circulation. Lots students learning Electronics had read the book in their university library. As well as me when I was a student I prepared for testing on Antennas using the book.

Now the book is the real "hard- to- find" thing. However, I have got a "pdf copy of the book and now the book is in free access for everyone.



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"Foreign Military Weapons and Equipment"
Volume VI
Signal Equipment
Department of the Army
Pamphlet no 30-11-1


The Pamphlet was published at 1951. At the time the book was a Secret, Restricted Book. However, at our times- 2009, there is no secret in the book. The book is freely sold at different points in the Internet. Just do googling and find out lots data.

I managed to find in the internet a part of the book in the pdf. The part is available in the Library at Antentop site.


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Receiving Magnetic Loop Antennas
By Igor Grigorov, RK3ZK

If you can read in Russian you can download a free 56- pages e- book "Receiving Magnetic Loop Antennas" by Igor Grigorov, RK3ZK. The book is e- variant of a chapter from a paper book "Antennas for Radioamateurs printed in Russia". Some fragment of the book was translated in the English and was published (and, as I hope, will be published) at ANTENTOP. Other fragments of the book also going to be translated in the English.

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Antennas Patents

 

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Short Wave Radio Antenna System


Just a description of the patent of the famous "Jim Slim" Antenna

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Broadband High Frequency Sky- Wave Antenna

Just a description of a patent for a broadband, HF directional antenna for Sky- Wave communication.


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Multi Frequency Band Antenna

Just a description of a patent for antenna that could be used at multiply frequencies.


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Last update: March 29, 2016 9:05