Re: NEC-LIST: How to design a feed network for a microstrip array?

Good day Xing,

The word "array" implies that you want to operate several antennas on the
same frequency to get an improved pattern. From your message, I gather that
you want to drive the two antennas at different frequencies from a common
feed line. This is normally done by inserting a three-port network called a
diplexer between the feed line and the antennas. The diplexer does a
low-pass/high-pass split and the complexity of the design depends on how
sharp you want the band edges. I believe you can find a lot of info in the
printed literature, I don't know what you'll find on a web search. Good
luck.

Sincerely,
Doug Miron

----- Original Message -----
From: "chen xing" <xingcsc_at_yahoo.com.cn>
To: <nec-list_at_robomod.net>
Sent: Wednesday, May 17, 2006 5:09 PM
Subject: NEC-LIST: How to design a feed network for a microstrip array?

Hi all,
  I have designed two microstrip antennas. They have
different size and cover different frequency bands
(610MHz-960MHz and 1350MHz-1850MHz respectively), but
their input impedances are the same, about 90 ohm at
their working frequency bands. Now I try to integrate
them on one PCB as an antenna array. I don't know how
to design the array, especially how to design a feed
network.
   Thanks,

               Xingc

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