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,,,okay,thanks buddy....!!!

4,5-5.4 GHz ; 21 dBi....all dimensions...!!!!

Aksonx2, I see you have this MAPLE antenna, can you give some dimensions....???

A method to improve the gain of axial-mode helical antenna is proposed. This method involves a parasitical circular metal disk,which is installed on the front of general axial-mode helical antenna and is apart from the helical line. A circular current whose phase lags behind that of helical line current appears,which brings a more concentrated radiation field. Consequently,the antenna gain is improved, Based on the simulation results,an antenna array model fed independently is proposed.This model gives an excellent explanation of the radiation characteristic of helical antenna, Both the simulation and experiment results show that for obtaining the same gain,the antenna length in this new method is only 71% of that in traditional helical antenna.The reduction of antenna length favors the miniaturisation of antenna. In addition, this method has a little effect on the bandwidth of antenna, so it can be widely used in the design of helical antenna element and array.

,,,,for which this MiMo antenna can cover the frequency band 2.1-2.6 GHz ... ???

PCB UWB antenna Antrad-11 0.6–8.0 GHz UWB highly directional PCB antenna Antrad-11 (RVS-A2) can be used in radar, radio monitoring and radio communication systems operating in 0.6-8.0 GHz frequency bands. Can be used as the measuring antenna. Gain up to 13 dBi (fr.= 3 GHz) Impedance 50 Ohm VSWR not more than 2.5:1 Antenna size 325 х 200 х 1.5 mm Connector SMA (male/female) Material FR4 an attempt of mine...

The theory of these antennas from the electrodynamic point of view is very difficult. At the moment, the parameters of such devices are selected empirically with the help of software systems electrodynamic simulation such as CST Microwave Studio... And here's one of my older projects.... By pasting a line of triangular adaptation can adjust impedance across the frequency range.

The BDM-2 is a wave channel with crack initiation, and delay line is made of sequentially installed disk elements. Compared to classic antenna BDM new directed antenna BDM-2 is: More gain; Improved radiation pattern; More stable operating parameters; Greater reliability; Superior mechanical characteristics.

Anyway, I like pyramidal horns, better, because they are easier to build....!!! ,,,and some constructive details... ,,, if the dimensions of the pyramidal cone are reduced by half(240/2x175/2x290/2), these results are obtained...

,,,okay,thank you...!!! ,,,but you see, I addressed this topic a few years ago...!!!

,,,yes...!!!

,,Heinkel,you are from Spain...??? ,,,it means you met zero13 wireless.net...!!!

Okay Clanon, I'll try to do this too...!!! Yes, that's it.... RondCone.cst

,,,another version with different dimensions...

Yes, it seems like they should be larger in diameter...!!! ,,,now it is 20 mm...

The four-arm helical structure antenna is composed of four helical arms, and the length of each is an integer multiple of a quarter wavelength. The current amplitudes of the feed ends of the four spiral arms are equal, and the phases are sequentially different by 90°. It has a cardioid pattern, a good front-to-rear ratio and excellent wide-beam circular polarization characteristics. It is very suitable for use as a receiving antenna for a satellite positioning system. Parameter: Antenna impedance: 50 ohms Working frequency band: 1.4 ~ 1.68GHz Size: 23mm*78mm*1.6mm Weight: 8.4g Antenna connector: SMA (male)

There are two types of antennas, RHCP, and the LHCP. Don’t be overwhelmed, it’s easy, we’ve outlined the basics below. RHCP antennas are known in full as Right Hand Circular Polarized antennas. LHCP antennas are known in full as Left Hand Circular Polarized antennas. Sometimes, they are both known simply as Circular Polarized (CP) antennas. Due to its polarized nature, this type of antenna will reduce any radio interference by a process known as multipathing. This blocks out unwanted radio signals and can give a much cleaner signal. For which below I was looking to do a simulation of the antenna after the Iulian Rosu site ... ??? https://qsl.net/va3iul/Antenna/Printed_and_Microstrip_Antennas/Design_Ideas_for_Printed_and_Microstrip_Antennas.htm

No, I don't think so, but I'll try to do a simulation of what this type of helix is like. What frequency are you interested in??

Go to template based post processing and select far field from there and then go to results and calculate electric field for theta and phi and find the phase difference which actually gives the polarization whether linear, circular or elliptical.

Anjana, for what you want, try adding 9-10 more passive elements...!!!

,,,for anyone who wants to optimize this antenna... sunflower pcb.cst

Ultra-wideband UWB Sunflower Antenna Basic parameters Frequency range: 2.8GHz-11GHz Polarization mode: linear polarization Rated gain: 3.8dBi Return loss: 10dB Power capacity: 5W Connector type: SMA-K Mechanical parameters: 30 mm X 42 mm Not include Connector Direction sensitivity Omni

AppCAD_setup.exe ,,,for wave port,on YouTube,search "waveguide port creation tutorial in CST"

Another option...

I followed this forum and tried to do a simulation for this frequency (L-band 1500-1700 MHz)....for last mystery of maritime communication-satellite Inmarsat!!! https://www.radioscanner.ru/forum/topic50990-11.html