Re: CROSS-POLAR ANTENNAS.

Our headquarters engineering staff is presently evaluating cross-polarization
antennas for use in the 1900 MHz PCS band. I believe Huber-Suhner and EMS
Wireless are the vendors involved. I haven't seen much good independent info
on these. I did, however, see a reference to some IEEE papers in one of the
vendor's catalog materials.

IEEE Transactions on Vehicular Technology, May 95
IEEE Transactions on Vehicular Technology, Aug 90

Hope this is helpful. Please pass along any interesting results you may
find!

Doug DuPerow
RF Design Manager
Sprint Spectrum - Detroit
duperodj_at_dtwpoa01.spectrum.spectrum.sprint.com

In a message dated 96-04-01 07:44:28 EST, you write:

>Subj: CROSS-POLAR ANTENNAS.
>Date: 96-04-01 07:44:28 EST
>From: MICHEL.SPELIER_at_GSMEOFN.BELGACOM.RTTIPC.belgacom.be
>Sender: davem_at_ee.ubc.ca
>To: nec-list_at_ee.ubc.ca (Non Receipt Notification Requested)
>
>Hi everyone,
>some questions here from a cold but sunny Belgium.
>We are investigating the use of cross-polar or ortho-polarized antennas for
>use in our cellular network
>in distinct environments. (urban-multipath)
>We obtained a sample here with +45 / -45 degrees of polarisation in one
>package with roughly 15dBd,
>in the E- and H-plane. This gain figure has still to be confirmed.
>The antenna has two connectors at the bottom. This antenna type certainly
>looks promising.
>
>1) If equal power is applied to to both ports, through a power splitter,
>without actually knowing at
>the correct phasing between both ports, will the antenna keep its predicted
>radiation pattern or will it stear?
>The manufacturer is not supplying this information, which should be known
>before attempting circular polarisation
>
>2) What will the polarisation in the above-mentioned situation be?
>
>3) How can you measure the phase shift between every antenna port at its
>connector,
>without breaking up the protective cover?
>
>4) I have AO6.0 and Nec/wires but I have yet to experiment with the
different
>
>source amplitudes.
>
>I am looking for advice from people, who have explored this domain more
>deeply, eventually references to reading material, or people who can supply
>practical information upon the use of polarisations different from the
common
>
>Vertical.
>Thanks in advance,
>Michel Spelier
>ON7EH
Received on Wed Apr 10 1996 - 21:47:00 EDT