eco32

Solution rarely used, reduces sidelobs, separates from interfering signals, should not affect VSWR, may narrow main beam. Do you use or have seen this?

Before simulating and building the antenna, I wont to learn something about the principles of selecting elements. I have two booms of 2m each and 40 printed insulated supports for antenna. I assume that it will be possible to achieve more gain from loop antennas than from traditional Yagi Uda. sources: [1] Balanik Antenna Theory (2th)- 10.3.4 Yagi-Uda Array of Loops - page 597 Ina numerical parametric study of coaxial Yagi-Uda arrays of circular loops [37] of 2 to 10 directors, it has beenfoun d that the optimum parameters for maximum forward gain were 1. circumference of feeder 2πb2 1.1λ, where b2 is its radius. This radius was chosen so that the input impedance for an isolated element is purely resistive. 2. circumference of the reflector 2πb1 1.05λ, where b1 is its radius. The size of the reflector does not strongly influence the forward gain but has a major effect on the backward gain and input impedance. 3. feeder–reflector spacing of about 0.1λ. Because it has negligible effect on the forward gain, it can be used to control the backward gain and/or the input impedance. 4. circumference of directors 2πb 0.7λ, where b is the radius of any director and it was chosento be the same for all. Whenthe circumference approached a value of one wavelength, the array exhibited its cutoff properties. 5. spacing of directors of about 0.25λ, and it was uniform for all. [2] NTMS 12' (45 Element) And 6' (25 Element) 1296 MHz Loop Yagi Club Project 1979 (I haven't found anything newer) https://pdf4pro.com/view/1296-loop-yagi-dimensions-ntms-1a4d92.html Elements Length R1-R2 10.23” DE (brass) 9.59” D1-D11 8.81” D12-D17 8.55” D18-D25 8.25” D26-D42 8.25” [3] Efficient Modeling of Radiation and Scattering for a Large Array of Loops https://www.researchgate.net/publication/224096495_Efficient_Modeling_of_Radiation_and_Scattering_for_a_Large_Array_of_Loops

A very old design from the time when there was no access to VNA or simulation programs. I'm not sure if this design makes sense, but it looks cruel (purpose TV broadcast)

Actually ..... it is a biquad, very modified and more wideband.

I did mistake, it is stub balun not a stubm balun

This is an interesting and surprising design - Tuning directores positions process looks terrible, so much elements and only 14dBi. @Admin, Your version of the biquaod was better. Now we know that this is a dead end road and that it doesn't work.

Thats stubm balun, it may be directed downward or upward, I have no idea what the difference in operation is. Only klow that is to phase shift. (My version in previous page was tunable)

How is it made? i know coaxial COCO only : (reasembling 1800MHz antenna to 1296MHz

1296MHz, previous tests have shown that the antenna also works on the higher bands. I will take two on the VNA and do an S12 between them, then we will know what it looks like. 6xbiqod project has name "MATHYLDE"

Balun has also possibilites be a filter, I wants to do it this way. (it is possible that in the middle of the gap there should be a short circuit to ground on one side)

a)New aproach, converting biquad to biloop, not tested yet quick and careless soldering b)Four biqads for array, eventually there will be six (I have 1:6 powe combiner, thats why six)

thats ~20dBi 920mmx740mm 1296MHz, adequat Yagi will have 4m boom other pictures: https://www.wifi-antennas.com/topic/102-simple-dipole-antenna/?page=2#comment-20589 thats good?

920 cm pacyfic grid atenna with dipole (with coaxial splited balun and one reflector) wil gove You 19-22dBi, adequat Yagi will be 2m long and and should be carried out with great precision (+/- 0.1mm) add: thats the solution from Slovakia

from documents:"Wideband quasi‐Yagi antenna with stable radiation patterns for base‐station applications" and "A Novel Wideband Quasi-Yagi Antenna for Base-station Applications" > simulated gain ranges from 8.0 dBi to 9.8 dBi in the operating band. that is same gain as in simple biquad but a simpler design.

@Admin {,,,this construction is a bit wrong, mcNeill doesn't really do good things...!!!} McNeil, He performs titanic antsy work in making phantoms, but do not fully understand it, for example, phase shifters are called load coil, and so on and so on... {,,,on this forum there is such a dipole in the correct construction...!!!!} HAMs do not know it, I have not yet seen any HAMs construction with the use of this type of matcher/balun. Most popular is this one: This is material for a separate topic, LTE/Wifi antennas rarely have a balun.

Thank You, colecting materials ongoing.

@Admin This is amazing, this ring makes no obfuscation effect. The feed on the 1296MHz is usually large, and here it works as in an ofset antenna. I have not seen such a design before. BTW, Are You doing EME?

this one:

@Admin in my opinion, this antenna can be more efficient than a biquad, I would be happy to make such an antenna for 1296Mhz if you are willing to simulate and provide dimensions. I will compare with biquod made in same technic.

thats how it is made:

Only few types of the antennas dont need a impedance adapters. The others will have a high loss. Do they have good results without this? The results will be adequate for the price.

Need more than 17dBi? You have to build antenna 10*Lambda boom, You nedd 20dBi than yo have to use Yagi with 20*lambda boom lenght, or try grid or parabola 10*lambda radius will give aprox. 30dBi

@Jeriyant: What is the impedance and did you use a balun?

https://www.youtube.com/@mul_onochannel1569/videos

No one did it with biquad