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Below is the image of a GPS module. I have highlighted the antenna in the yellow box:

enter image description here

What is the name of the antenna in the yellow box (Question 1) ? Is the type of this antenna APM 2.5 (Question 2) ? What does APM stands for in APM 2.5 (Question 3) ?

Is the connector of the antenna IPX? There are different sizes of IPX, what are they ? Is IPX connector also known as UFL (Question 4)?

I would appreciate answers to any/some/ all of above related questions.

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    \$\begingroup\$ plug looks like U.FL but yeah IPX looks similar. \$\endgroup\$ – Jasen Aug 19 '20 at 7:04
  • \$\begingroup\$ Informally everyone calls these U.FL which is actually the Hirose part number. But if you call it something else, nobody understands what you refer to. \$\endgroup\$ – Lundin Aug 19 '20 at 13:42
  • \$\begingroup\$ They don’t seem to indicate on the datasheet for some reason.? \$\endgroup\$ – Tony Stewart EE75 Aug 19 '20 at 13:42
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This antenna type is called ceramic patch antenna.
If you google APM 2.5, you will find that it stands for ArduPilot Mega 2.5, which is a drone autopilot system, for which this GPS-receiver board (designator GY-GPS6MV2 on the PCB) is probably designed.
Yes, it is a U.FL connector, which is like you said also known as IPX (see this question: Difference between Hirose U.FL and IPEX connectors)

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