Admin

The dielectric constant of styrofoam (expanded polystyrene) is approximately 1.02–1.04. This low value is due to its low density, which consists of air bubbles (with a dielectric constant close to 1) and the polystyrene material itself. The dielectric constant of solid polystyrene resin, without the air pockets, is higher, ranging from 2.4 to 2.6. For expanded polystyrene (styrofoam): The dielectric constant is approximately 1.02–1.04, which is a very low value due to the high volume of air in the foam. For solid polystyrene resin: The dielectric constant is higher, ranging from 2.4 to 2.6. Factors influencing the value: The dielectric constant is influenced by factors such as density, moisture, temperature, and frequency. Frequency dependence: While the dielectric constant of solid polystyrene is relatively flat up to 1 GHz, the value for the foam is measured in specific ranges, like 100-400 MHz.

A horn antenna is one of the most commonly used antenna types for a focused antenna. However, the horn antenna is limited by its dimensions, which must have a certain size relative to the wavelength in order to work properly and efficiently. Since this will typically be too large to fit into the flange, a dielectric lens antenna with reduced dimensions is developed. The lens has the spherical form which is able to enhance the gain by making use of guided surface waves. The antenna is fed by a circular waveguide and at the boundary of the dielectric half space. A stepped impedance transformer has been introduced in order to provide broadband input matching impedance. Dielectric rod antennas refer to traveling wave antennas with a slow phase velocity (vf< s). They are used at the border of the centimeter and decimeter wave ranges in the frequency band from 2 to 10 GHz. Dielectric lenses are made of materials with high dielectric constants, such as polystyrene, polyethylene, and plexiglass. They can be integrated with various types of feeds, such as horn antennas, microstrip antennas, and waveguide antennas.

This is harder to build...

After so many years I tried to recreate this antenna with the dielectric lens....

This project is dedicated to Doyt R. Hoverman (b.1913), the man who created and did the early work on the Hoverman antenna at a time when antenna modeling programs did not exist. His work would have been entirely created and improved by field testing, trial and error, and with a great amount of calculation without the benefit of electronic devices. Without his efforts, our work would not have been. Doyt Hoverman passed away in December, 1989 at Van Wert, Ohio, USA. Technical data Simulation With insulating spacers

,,,2.1---2.5 GHz, is the frequency range quite good...???

,,,does this suit you...??

I don't know if this can help you.....

If I remember correctly, I tried something like this... but I'll try this square bester too, inside of beercan...

,,,there... bester.stl

Clanon, maybe you can optimize this.... bester comercial.cst

I wonder if the antenna elements have concentric copper circles on PCB...???

Yes, but it seems that many people still buy it....

Okay, but what's interesting is that this antenna has elements made of PCB....!!!

,,,,hi buddy...!!!! It's pretty good, if you have it, try it....!!!

,,,maybe USB Adapter can increase the gain...!!!???

Because this site is not completed in real operation, it is recommended to replace the current Theme2(Default) with Default, as you can see in the picture below... Default theme it looks like this...

I think this is the adaptation more clearly seen....

,,,,okay, now you can do a simulation...!!!

Hello everyone.Here are proven horns for offsets at 5.4 Ghz offset 60cm . horn5,4ghz.cst

Technical specification for manufacture of powerful antennas and high gain exclusively for FPV needs was consistent with the known Scientific-Production Center. The centre has a serious scientific potential, SOOOOO expensive equipment, modern production base and its patented production technology. The guys have been designing and manufacturing aerials for over 15 years and know about antennas just about anything, have experience of working with domestic manufacturers of UAV, FPV, therefore, subject them in part familiar and in this respect they have certain practices. Just what we needed: 1) Create an antenna that would have a large gain, comparable with the antenna "Yagi" in the popular FPV range 1160-1280Mhz. 2) To the antenna form factor was close to a patch antenna (for ease of placement on a tripod) 3) had an adequate angle of orientation, eliminating the need to use the rotary system for tracking the model at long distances Antenna gain from a 14.7 dB at the extreme frequencies of the range 1160Mhz 1280Mhz. Not difficult to guess that the gain in the middle of this range is significantly higher (the guys understand the task "literally"). This reinforcement is "not theoretical" and measured on real devices, on average, it in two times better than any patch. 2) the Antenna has dimensions of 400х400х25мм (including the case) 3) the Angle of orientation of the antenna about 40 degrees, which is not bad. Specifications : The most effective frequency range: 1160-1280Mhz The gain in the effective frequency range: 14,7 dB VSWR: less than 1.5 Polarization: linear vertical The radiation pattern Vert/Horiz: 40/40 degrees Input impedance: 50 Ohm Connector: N-type "mother" Weight: 2kg As we can see, the antenna is a... rather strange design four groups oval active elements. Between them the special material. The reflector is a metal substrate, the active elements in each group, TWO(!!!) (instead of one in the classic patch).

,,,that's clearer...???

,,,it could be something like this...