Which antenna is insensitive to the effects of a wall?

[Ghost Tweaker]

Antenna against a wall

Hi everyone,

I working on a transceiver to be placed on a metallic wall. Now i need to choose a PCB antenna for the transceiver. Does someone know which type of antenna would be good (ie insensitive to the effect of the wall) for such an application?

Ghost Tweaker

 

[brmadhukar]

Re: Antenna against a wall

The choice depends on application. What is the frequency.

 

[mogwai]

Re: Antenna against a wall

I'm not sure if exists an antenna insensitive to a metallic surface in its vicinity

You can try a microstrip p atch antenna or a variant (with a groundplane) and place the groundplane facing the metallic wall. Otherwise you could possibly get your transceiver's RX path desensitized from huge reflections in the near field.

Just some thoughts hehe
Any further discussion would be helpful on the matter.

cheers!
mogwai.

 

[Ghost Tweaker]

Re: Antenna against a wall

The frequency is 868MHz ISM band.

That's what i was wondering about. As far as I know, if i use an antenna with a ground plane, the effect of the wall should be minimized...thus a patch would be ok.
For a PIFA, we do not have a ground right?

 

[Redi]

Re: Antenna against a wall

The frequency is 868MHz ISM band.

That's what i was wondering about. As far as I know, if i use an antenna with a ground plane, the effect of the wall should be minimized...thus a fix would be ok.
For a PIFA, we do not have a ground right?

Hi,

PIFA is just a type of patch antenna. The idea of PIFA is to make antenna smaller, but it has ground plane like every typical microstrip patch antenna.

Greetings,
Redi.

 

[mogwai]

Re: Antenna against a wall

Could someone explain me why I type "p atch" and in the topic is substituted by "fix" ?? hehe

I noticed you guys had the same problem with the word "p atch". I'm writing it with an extra space to appear right, or else it reads "fix"...

mogwai.

 

[flatulent]

Re: Antenna against a wall

This is an attempt to keep people from violating the site rules by asking for illegal methods of making software work without a purchased license. This way if someone searches for the P word they will find nothing. We moderators read all of the posts and erase the ones with such requests, but there may be a few hour time delay.

 

[mr_ghz]

Re: Antenna against a wall

You can use a 'standard' lambda/4 antenna and place it lambda/4 away from your metalic wall. So your wall will serve as a reflector and give you an additional gain.

Bye

 

[Ghost Tweaker]

Re: Antenna against a wall

For the PIFA, I understand that it has a ground plane, but there's no ground plane under the radiating part like for example in the patch antenna case, right?