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I have a query regarding PCB microstrip antennas. Most of my antennas have been straightforward with the U.fl being placed close to the RF feed point. Maybe a PI filter is added. But I have seen many PCBs with unique antenna shapes. Point in case, image attached. How are the parameters for these ascertained?

enter image description here

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  • \$\begingroup\$ Also, in the above image there is no ground pour near the antennas. How come the 3R rule (regarding the spacing of the aground pour from the antenna) does not apply here ? \$\endgroup\$
    – Board-Man
    Jul 14 '15 at 13:08
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Designing (PCB) antennas is a science by itself !

The 3R rule you mention probably applies to a certain type/configuration of antennas only. The fact that there are many uniquely shaped antennas tells you that there are many different solutions.

Usually these antennas are designed by a specialist using 3D Elector-Magnetic simulators like CST or HFSS. This software + some imagination + experience + a little bit of magic can sometimes result in a usable antenna ;-)

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