A dual pol panel antenna can be an order of magnitude more difficult to make than a single linear polarized antenna. Almost all panel antennas are either an array of patches or an array of butterfly dipole elements over a ground plane. Most designers are trying to put as much gain in the area as they can. The means the feed network and driven elements are crammed in so close together that you suffer some degradation. To make a dual pol patch you have to use a square patch. That already is less than optimum. Then you have to produce a second feed mechanism for feeding the second feed point on all the patches. That means other layers and intermediate ground planes etc. Not easy at all.
----- Original Message ----- From: "Tom DeReggi" <[EMAIL PROTECTED]> To: "WISPA General List" <wireless@wispa.org> Sent: Saturday, September 27, 2008 9:49 AM Subject: Re: [WISPA] Dual Pol Antennas > Drew, > > Who sells/stocks it? > > I also saw someone was selling what looked like the MTI Dual pol 25dbi for > about $200, I think it was wlanparts.com. Thats starting to get > affordable. > > I'm fine with Dual Pol dishes for $225, its a lot of metal. Plus there > usually needed for more critical links. Also used more often on tower > sites > where I get charge per antenna. > However, when a standard panel is only $50, it can't be that more > expensive > to add a couple more elements for the second pol. > Clearly a lot of markup fat in the price model. I think there is a huge > market for the dual pol Panels at sub $150, but at $250, a WISP really has > to think about whether its worth their while, when they can just install > two > single pol antennas side by side. Expecially if isntalled on customer > roofs > where there aren;t colo fees. I see no reasons that the smaller gain > panels > couldn't be made and sold for sub $125. Don't get me wrong, its still > good > news to learn of new DP panels available as option. Trango also has their > external model, but its about $300. > > Tom DeReggi > RapidDSL & Wireless, Inc > IntAirNet- Fixed Wireless Broadband > > > ----- Original Message ----- > From: "Drew Lentz" <[EMAIL PROTECTED]> > To: "WISPA General List" <wireless@wispa.org> > Sent: Friday, September 26, 2008 6:58 PM > Subject: Re: [WISPA] Dual Pol Antennas > > >>A product I really like for dual-pole is the Mars WA56-DP25N. It's a >> pretty inexpensive panel from 4.9 - 5.875 @ 25dBi .. There are 2 >> versions, 1 is the antenna alone, the other is with an enclosure. Its ~ >> $260. I know its not $150, but its not too bad! >> >> -d >> >> >> On Sep 25, 2008, at 10:04 PM, Mike Brownson wrote: >> >>> A broadband dual pol dish will work from 5.2 to 5.9Ghz. You'll get >>> the same gain on both polarities. But there's noting I know of less >>> than $150. Usually dual pol dishes are used where you may need a >>> higher quality antenna, so all the manufacturers I know of >>> (RadioWaves, Maxrad, Pac Wireless) for dual pol are the higher grade >>> varieties. >>> >>> Mike >>> >>> ________________________________ >>> >>> From: [EMAIL PROTECTED] on behalf of Blair Davis >>> Sent: Thu 9/25/2008 8:41 PM >>> To: WISPA General List >>> Subject: [WISPA] Dual Pol Antennas >>> >>> >>> All this talk about Dual Pol feedhorns has got me curious.... >>> >>> I'm looking for a dual pol antenna... >>> >>> What I need is H-Pol on 5.3GHz band with 18db or more of gain and V- >>> Pol on 5.8GHz with 15db or more of gain. A narrow beam width is a >>> plus. >>> >>> A grid or a dish will be fine. I'd like to keep the price down as >>> if it is over $150 or so, it really won't be cost effective. I can >>> mount 2 antennas at this location if I have to. >>> >>> This is for a short link, about 2000ft, but it will be at the end of >>> about 50ft of LMR-400. >>> >>> Thanks for any ideas.... >>> >>> Blair >>> >>> >>> This email and any files transmitted with it are confidential and >>> intended solely for the use of the individual or entity to whom they >>> are addressed. If you have received this email in error please >>> notify the system manager. This message contains confidential >>> information and is intended only for the individual named. If you >>> are not the named addressee you should not disseminate, distribute >>> or copy this e-mail. >>> >>> <winmail.dat> >>> >>> -------------------------------------------------------------------------------- >>> WISPA Wants You! 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