Wireless Access

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Contributor II
Posts: 40
Registered: ‎10-01-2015

Why does the IAP-275 have 1 large and 2 small antennas for the 5GHz, but 3 large antennas for 2.4GHz

I opened up an IAP-275 to look at mounting options on a portable site survey kit and noticed that of the 6 antennas, 2 are shorter. These 2 short antennas are both 5GHz antennas (5G1 and 5G2). The 2.4GHz antennas are all large ones. Is there a reason or what's the difference between these antennas? 

MVP
Posts: 1,310
Registered: ‎11-07-2008

Re: Why does the IAP-275 have 1 large and 2 small antennas for the 5GHz, but 3 large antennas for 2.

There are two V-pol and one H-pol antenna per radio (3 antennas per radio). The H-pols require a different design than the V-pols, so they are different sizes.

Jerrod Howard
Sr. Techical Marketing Engineer
Contributor II
Posts: 40
Registered: ‎10-01-2015

Re: Why does the IAP-275 have 1 large and 2 small antennas for the 5GHz, but 3 large antennas for 2.

Hi jhoward,

 

How come is there a difference between the 2.4GHz and 5GHz? So the 2.4GHz has different antennas?

 

Tom

MVP
Posts: 1,310
Registered: ‎11-07-2008

Re: Why does the IAP-275 have 1 large and 2 small antennas for the 5GHz, but 3 large antennas for 2.

Different frequencies means different length of antennas to maintain the same gain (which is why you will often see dual-band omnis that have different gains depending on 2.4Ghz or 5Ghz). And yes, each radio has three antennas, 2 V-pol and 1 H-pol antenna (v-pol is vertically polarized, h-pol is horizontally polarized).

Jerrod Howard
Sr. Techical Marketing Engineer
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