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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).

Bottom of a circular metal box can build a simple antenna with an elliptical radiator...

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

,,,for Clanon... PAGODA.stl

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).

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...??

,,,take it... stella-5.cst

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

,,,the antenna looks very good but it would be interesting to see its feed points (inside)...!!!

The high quality Patch antenna for 5.8GHz receiver. Can increase the range of 5.8GHz transmitter This 5.8GHz Right-Hand (RHCP) Circular Polarized patch antenna was custom-designed for the FPV market. Light enough to be mounted directly onto an FPV headset including the FatShark Goggle system or Uno and Duo FPV receivers. With a much wider beam than it's 13dBi cousin, it easily has double the range of a standard SpiroNET Omni antenna. Specs: Circular Polarization: Right-Hand Band: 5.8GHz ISM Gain: 8dBi Beam width: -3dB at +/- 45 degrees (H + V) (90 degree total) F/B Ratio: >356dB VSWR: < 1:1.35 at 5800MHz Impedance: 50 ohms Weight: 7g