3
$\begingroup$

I have very little knowledge about antennas (I just read about simple dipoles and monopoles recently) and I need to buy a directional antenna for my wireless device. I have found a cheap antenna (I know cheap eBay antennas are not what the sellers claim) and I want to know more about the antenna before buying it. The seller listed that it has an 8dbi gain, <2 VSWR and they didn't provide the radiation pattern. I have an image of the antenna elements, can you please tell me the type of the antenna? Then, I can read some more about this specific type.

Inside, it is formed by two plates. The driven element is a 40x50mm plate. The reflector is larger, curved, and grounded. A black plastic is there between the plates but there is a metal bolt in the center causing electrical contact between the plates.

Edit: Is the metal bolt okay in this design? It is sorting the patch and the ground.

enter image description here enter image description here enter image description here

Please forgive me if this is a very common antenna. As I have said, I am very new to this.

$\endgroup$
  • 2
    $\begingroup$ Yes, it is okay. At the center point is ground on both plates/patches. $\endgroup$ – DB1UJ Jul 16 at 12:19
1
$\begingroup$

This is a Planar or Patch Antenna. https://www.oreilly.com/library/view/rf-and-microwave/9781118349571/c07_level1_5.xhtml

$\endgroup$
  • $\begingroup$ Thank you for the introduction about patch antennas. I will create a trial account and read the full text. But just a follow up question, is the metal bolt okay? It is sorting the patch and the ground plane. $\endgroup$ – Sourav Ghosh Jul 16 at 12:03
  • 3
    $\begingroup$ Thanks Joerg for the helpful tip here and welcome to the site! I should point out that we try to encourage answers to include a summary of the relevant parts of linked content especially (but not only) when they require a subscription to access. A lot of times just knowing what something is called is half the battle, though, so this is well on its way to being a helpful answer already! $\endgroup$ – natevw - AF7TB Jul 16 at 15:14

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.