antenna bluetooth design HELP PLEASE

hi everyone, I'm studying telecomunications engineering and I just started a new subject: antennas and radiopropagation.
So the teacher wants me to bluid an bluetooth antenna (9dBi) and I have NO IDEA of how to start. He sucks cause he hasn't explain anything yet.
I'll be so thankfull if anybody can help me. PLEASE :-(

A single dipole gives you about 2.13 dBi, adding a large enough ground plane at say 0.1lambda distance will increase the gain to about 8 dBi. to further increase the gain you could use:
corner reflector to direct the radiation further, or use the array approach.

a full wave dipole or 1.25lambda dipole over a large enough ground plane gives > 9 dBi, this are both 2 array elements over a ground plane. If it must be circular polarized, you need to feed at least 2 half wave resonating patch antennas in phase.

First task should be to know why you get certain current distribution, what is radiation resistance, how the far field radiation pattern relates to the current distribution in single antennas and arrays, how radiation pattern (beam width) is related to gain, behavior of ground planes (image theory), etc.

I think you will visit your library to find some books on antennas. There are many, varying from recipies to pages full of math. Just some titles: Antennas (kraus/Marhefka), Antenna Engineering Handbook (Johnson), Electromagnetic Waves & Antennas (S. J. Orfanidis), Balanis.

Without guidance the learning curve can be long. If you have some good 3D imagination, are familiar with transmission line theory, know LCR circuits and have good guidance, you can make very fast progress.

It would be helpful to have an EM simulation package and somebody who can guide you. Using such a package can help you to develop feeling for what happens in a piece of metal when you excite it with some RF source.

Heya GlendamoralesG,

Not being sure how far along the long learning curve you are, I'll add a little background to WimRFP's answer: The antenna won't care about the data protocol (e.g. bluetooth) - what matters is it's operating frequency (~2.4 - 2.5 GHz in this case) and intended gain. Any (passive) antenna with a gain exceeding 0 dBi exhibits (by definition) some directionality, so it's up to you [presumably?] how you want to "concentrate" it's energy to achieve the desired gain.

There are a myriad of antenna varieties - each optimised for a certain charactistic - although certain architectures share common features. For example, antennas featuring a vertical bit of wire will generally produce a radially symmetric radiation pattern. Adding extra (appropriately phased) vertical bits of wire "flattens" the pattern into a more concentrated (read: higher gain) symmetric disk. Antennas with reflectors (dipoles + planes, yagis, dishes etc) produce radiation patterns akin to a flashlight beam. The polarisation of the antenna is yet another degree of freedom, and opens up a realm of other possibilities such as slots, helixes etc etc.

An excellent non-mathematical introduction to some antenna options and their practical tradeoffs/implementation details etc is the ARRL antenna handbook https://www.amazon.com/ARRL-Antenna...8&qid=1348103729&sr=8-1&keywords=arrl+antenna. I'd highly recommend this as essential (accessible) antenna background reading.

hi
its not difficult you can simulate it with a helix antenna or if u want microstrip u can u slot antenna with small reflector under it

Hi. Thank u. I forgot to say that its an antenna with directional panel. Does it change?

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Hi. Thank u. I forgot to say that its an antenna with directional panel. Does it change?

the both antenna has a directional pattern and i think that is too easy

ferdows said:

the both antenna has a directional pattern and i think that is too easy

Click to expand...

Could you explain me step by step?