60GHz antenna for WiGig

in general, the beamwidth of 60GHz antenna is narrow, how do this compancy design high gain and wide-beamwidth( SJ Antenna Design)

My first thought is how much gain and how wide (beamwidth)?

As gain increases, beamwidth decreases (assuming constant efficiency). The world is still looking for an omni-directional antenna with 10 dBi of gain. Now, if we could do that the energy problems would be solved.

Have you asked SJ what they are designing and how it performs?

Ntutom

When you look at their product it says 10dBi and 100degree-3dB beamwidth.i wonder how they came up with such a configuration,and if they have patented it :P. to my understanding probably its a typo. because when you look at the specifications further down it talks about beamforming,dont think you would be doing beamforming with a 100 degree beamwidth.

Regards
Sajid Mohammed.

An omni-directional antenna with 10 dBi gain is nothing special. Various colinears, designed for vertical mounting, have a narrow beam in the E-plane but no variation in the H-plane.

Remember, omni-directional is not the same as isotropic.

---------- Post added at 05:19 ---------- Previous post was at 05:00 ----------

Though if you look at the bottom graph here

Product - SJ Antenna Design

the line with the lowest peak gain, which is about 10 dBi, the 3 dB beamwidth is very wide. But I've no idea what it is in the other plane.

It's not the easiest web site to navigate.

I know Skymasts in the UK

http://www.skymasts.com

lie about their antenna specifications all over the place. They are very economical with the truth. But it seems to be the norm in the antenna industry to lie about specifications. Everyone seems to lie about specifications, so to remain competitive everyone else lies too. It just seems the norm.

[/QUOTE]I know Skymasts in the UK

http://www.skymasts.com

lie about their antenna specifications all over the place. They are very economical with the truth. But it seems to be the norm in the antenna industry to lie about specifications. Everyone seems to lie about specifications, so to remain competitive everyone else lies too. It just seems the norm.[/QUOTE]

Lol.well many might try to exaggerate with their findings,but not all i think might be down that way.

Didnt have a chance to look at the specifications.

Regards
Chachito.

Their web site is down now, but I know they ignore the losses of the coax in their gain figures, desite the fact the coax forms part of the antenna - i.e. it is sold with a length of cable, with the plug on the end of the cable. So short of modifying the antenna, removing the coax and making a direct connection to the antenna element, there is no way a user can get the gain figure they quote.

* The gains quoted are of the actual radiating element, and so losses in the coax are conveniently ignored.
* SWR figures are measured on the end of the coax, so obviously coax losses are used to their advange here, as that improves the return loss.

In other words, the reference point of each measurement is taken at the point which gives the best results - SWR on the end of the coax, gain of the actual element, ignoring contribution of the coax losses.

But Skymasts are not the only one in the UK doing this. I know it's common practice in the industry. The truth is their customers wont measure the gain figures, as they don't have the ability to do so.

I suspect at the more professional end of the market, companies don't do this, but when antennas are sold to home consumers, taxi firms etc, any old lies can be told. Take a look on eBay and see the claimed performance of some of the WiFi antennas

2.4GHz 25dbi RP-SMA Yagi Wireless WLAN WiFi Antenna New | eBay

25 dBi gain froma sort of 16 elemnt Yagi, but E and H plane beamwidths of 23 and 26 degrees. I doubt the beamwidths have ever been measured, but even if true, the peak gain would be about 9 dB lower than quoted.

This little antenna, 180 mm long (1.44

), has a claimed gain of 20 dBi.
2.4 GHz 20 dBi N plug Omni WIFI Antenna for D-LinkR " eBay
The seller has 99.9% positive feedback.

Deborah.

I have no idea whatsoever with what they do in UK.but unfortunately ebay is full of swindlers.

Regards
Chachito

I think in most cases the people selling them have no idea. I doubt the person selling the 20 dBi gain omnidirectional antenna which is 1.44 wavelenths long has a clue about antennas. Antennas are complex things to understand, and I doubt 0.1% of the population really understand them.

Completely understand your point. hopefully we will be in the .1% percent in the future :P.

Regards
Chachito