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In this tutorial you will learn how to simulate antenna devices in CST-Studio...https://space.mit.edu/RADIO/CST_online/mergedProjects/EXP_HF/examplesoverview/patch_antenna.htm

ECO, THE IMAGES ARE NOT VISIBLE...!!! "For how big the reflector is, the antenna gain is not that great."

I finally managed to do a simulation with this antenna....

A new small, low-profile and light-weight helical antenna element was designed for 2,1-2,4GHz-band communications. The novelty of the antenna is that its input impedance matching has been improved by adjusting the copper strip matching stub, while its circular polarization performance has been enhanced by changing the parasitic radiation patch loaded in the front of the antenna.

Featured outdoor antenna products which enhance your reception of 4G signal from the tower to your location. All antennas featured are easy to install and it is with the connectors required to connect to your existing modem.

You have many choices in selecting an antenna for a Wi-Fi wireless network adapter for your computer. If you use the antenna that came with the adapter and experience weak reception and slow Wi-Fi network performance, unscrew the stock antenna and replace it with a higher-gain model. Wi-Fi equipment makers rate compatible antennas in units called dBi. The higher the dBi rating, the stronger the antenna’s reception. Isotropic Antenna Wi-Fi antennas obey the same laws of nature that govern all other radio antennas. The isotropic radiator is the simplest theoretical radio antenna. It is a point source that produces radio waves equally in all directions. However, the isotropic antenna is just an idea; you cannot actually make one because it violates fundamental laws of physics -- thus, it is only theoretical. However, it can serve as a standard by which you can measure other antennas: the decibels --db -- compared to an isotropic radiator. Antenna Gain Every antenna has gain, a quality by which it increases the strength of a radio signal. Two main factors affect an antenna’s gain: shape and size. Shape influences the antenna’s directionality, or how it receives radio waves from different directions. The wavelength of the radio waves determine the radio’s size: an antenna receives signals best if its size matches the size of the radio waves, or is one-half or one-quarter the wavelength. For most uses, the better the antenna design, the higher the gain. Decibels When radio engineers compare the gain of antennas, they use the decibel system. A decibel is ten multiplied by the common logarithm of the ratio of two numbers. For example, if you compare 1 milliwatt and 10 milliwatts of radio power, you divide the second by the first and obtain 10. Taking the common log of that gives you 1, and multiplying it by 10 gives 10. The second amount is larger than the first by 10 decibels, or 10 dB. dBi Rating The dBi rating for a Wi-Fi antenna compares its performance to an isotropic antenna. If the isotropic antenna produces 1 milliwatt of radio wave power and the Wi-Fi antenna produces 2 milliwatts, that is 10 * log(2) or 3 dBi. If another antenna produces 3 milliwatts, that is 10 * log(3) or 4.8 dBi. Though the isotropic antenna doesn’t exist, it still serves as a reliable way to compare Wi-Fi antennas. You can compare the dBi ratings of the two antennas and choose one with the better dBi rating.

Model wireless network USB adapter TL-WN721N Lite N series supports IEEE 802.11 g and IEEE 802.11 b. It works great with all devices of the standards 802.11 b/g/n. An automatic detection of speed allows the wireless network USB adapter TL-WN721N to transfer data at high speeds (maximum capacity to 150Мбит/s).

,,,the feed point is not positioned there...!!!!

,,,for Clanon... PAGODA.stl

I think you should put an SMA connector instead of the discrete port - that might be the mistake....!!!

Cheap High Power Wifi Usb Adapter Sinmax SI-7300NA Sky Wireless Antenna Signal Long Range Wifi Adapter 30dbi High Gain Wholesale. Single frequency (2.4-2.4835GHz) Inside antenna...

,,,this is the real gain of this antenna(without Wifi Adapter)...

Then the mistake is somewhere else(on 3D Model)...!!!

Ground Plain is missing

You can put the CST-file...??

,,,like this...

In this paper, we design and analyze a dual-band rectangular patch antenna with slotted patch,patch and ground plane for 2.5 GHz and 5.2 GHz communications.

,,,,and this would be a wider band antenna with overall dimensions of 240x240 mm

,,,,yes, there are many types of antennas here...https://qsl.net/va3iul/Antenna/Printed_and_Microstrip_Antennas/Design_Ideas_for_Printed_and_Microstrip_Antennas.htm

,,,maybe 1800-2100 MHz...!!!

,,,you can try it...??

,,,dumser2,take it your desire...!!! stella-5.cst

I took over the redesign of this antenna and I came up with this version...