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,,,one of my oldest antenna variants...

One of the most simple and easy ways of coordination feeder impedance Z0 and the antenna ZA is a consistent inclusion in the feeder a small line segment with another wave the impedance ZS(on heterogeneity in a line). Length matching section (up to a quarter of wavelength) and the place of its inclusion in the feeder depending on the required the transformation ratio of the resistances and from the how its characteristic impedance differs from the wave impedance of the feeder. [1] Wave the impedance matching section ZScan to be within Z0 > ZS > (Z0 x ZA)1/2 , if ZA < Z0 , or Z0 < ZS < (Z0 x ZA)1/2 if ZA > Z0. Practically, when use feeder with Z0=75 Ohm, transformation of resistance of the antennas from 8.33 to 75 Ohm you can use a section of two parallel connected cables at 50 Ω (with the resulting ZS = 25 Ω). If Z isA not below the 33.3 Ohm matching section can have an impedance of 50 Ohms. Section two connected in parallel cuts 75-a lot of cable (ZS = 37,5 Ohm) provides the coordination 75-lot feeder with any of found in practice impedances of a multi-element Yagi antennas and Quad. If ZS = (Z0 x ZA)1/2, the length of the section becomes equal to 1/4 wavelength, and the distance from the load where the partition should be included in the feeder zero. This is a limiting case of serial transformer, widely known as "quarter-wave the transformer". Another private case - when ZS = ZA. Then the length of the section, and its distance from the load equal approximately 1/12 of the wavelength. [3] In another the limiting case, when ZA is close to Z 0 , the length of insertion of the Z's is committed to the zero point of the feeder, located at a distance of 1/8 the wavelength of the load (this case is not practical interest, as means that the transformation resistance is not required). For operational calculation of the matching antenna circuit that is configured to resonance (XAND= 0), you can use graphs 1-5. Sizes are in fractions of the average the operating wavelength, and physical length of the segments cables should be calculated based on the velocity factor, which is not always equal to 0.66, it is necessary to measure each cable individually. This kind the transformer allows you to coordinate not only the resonance of the antenna. For example, charts 6 and 7 shows how to change length of 37.5 Ohm section and its place in the inclusion of 75 Ohm feeder in depending on the magnitude of the reactive component (XA) the impedance of the antenna at two constant values the active component RA = 22 Ω, and 45 Ohms. by Yuri Baltin, YL2DX

,,,which frequency.../?

,,,yes...!!!

,,,a new Petra 9...

,,,another nonsense...

,,,another idea...!!!! It is not a good solution...

NITSA 1--it's very good, but I think it can be even better...!!!

NITSA-1 Antenna or Ceiling Antenna....???!!!

,,no, for this you need other dimensions...!!! ,,see the first post...!!!

...yes, but I don't really trust the gain of the antenna..!!!

Dedewe,how would that be...

,,,okay, I will try...for the frequency of 1800 MHz...??/

,,, for the impedance of 75 Ohm, the distance of 7 mm must be modified...!!!

I don't really think so, it has to be checked...!!!

If your model is symmetric, you may define this symmetry planes here. For particle tracking calculations the symmetry option can only be applied if no space charge and particle current is monitored. Therefore symmetry conditions cannot be applied for gun-iteration calculations. Important: It is necessary to create the entire structure first.Every symmetry plane you find reduces the calculation time by a factor of 2, so it is always recommended to specify symmetries, if any exist. The type of the symmetry can be either electric or magnetic. If you specify a symmetry plane, the calculation domain is cut in half. The picture on the right shows a calculation domain symmetric to the YZ plane. The symmetry type is electric. The calculation domain is cut in half twice more if a symmetry type for the XZ and XY can be found.

,,, with other caps, this can also be done... 2.3-2.7 GHz frequency band (UWB)

Coffee Amigo Cap as Panel Antenna What can be done with 4 COVERS instant coffee...!!!

,,or a Batwing antenna.... ....with a parasitic circular director....!!!!

4G 3g 2G LTE WCDMA GSM 800 900 1800 2100 2600 mhz Antenna GSM ceiling antenna for repeater or amplifier of mobile signal The Gain Is 5 DB. Coverage is not much more than that of a small pin antenna from the repeater kit (more than 1.5 times). 1-2 rooms. 5 DB. Plus (i.e. minus) the normalized signal loss at the N cable connection (if the antenna socket is connected by an extension cable).

,,,,this fractal antenna might be an older idea for AUREL...??? https://www.edaboard.com/showthread.php?275408-Fractal-Quad-2-4-Ghz&highlight=fractal+antenna

,,,a simple notched lid can be placed in the bucket... ,,,or so with the bottom of the bucket...

,,,it is still possible...!!! slot patch.cst

,,, it is possible, but a medium (center) frequency must be chosen...!!!

,,,and now I present to you the construction details....!!!