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ahiggs
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Last seen: 1 year 3 months ago
Joined: 2019-12-17 07:10
DA14585 microstrip impedance matching

Hello,

I am designing a space constrained circuit and would like to use a ceramic chip antenna and microstrip to match the impedance. In the DA14585 hardware design guide, it says to place inductor L1 (3.9nH for QFN) close to the DA. The closest I can get it is about 2mm from the antenna pin. Is the microstrip then placed after this 2mm trace or do I include those 2mm in the calculation of the microstrip length?

In the attached picture, the microstrip is circled in green. 

 

Thanks!

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ahiggs
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Last seen: 1 year 3 months ago
Joined: 2019-12-17 07:10
Further clarification of

Further clarification of antenna, microstrip, and inductor placement

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PM_Dialog
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Last seen: 1 month 5 days ago
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Joined: 2018-02-08 11:03
Hi ahiggs,

Hi ahiggs,

Please check out AN-B-054: DA14585/586 Application Hardware Design Guidelines document for the DA14585/586 product page. This document provide useful guidelines for preparing schematics and PCB layouts for your application using DA14585/586. Also, there this document available AN-B-027: Designing Printed Antennas for Bluetooth Smart, but is for how to design printed antennas.

Thanks, PM_Dialog