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Last post
Tue, 2020-02-11 13:21
#1
ahiggs
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Last seen:6 months 11 hours 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!

Attachment:
PDF iconantennaQ.pdf
Device:
DA14585
Tue, 2020-02-11 15:50
ahiggs
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Last seen:6 months 11 hours ago
Joined:2019-12-17 07:10
Further clarification of

Further clarification of antenna, microstrip, and inductor placement

Attachment:
PDF iconantennaQ2.pdf
Wed, 2020-02-12 10:12
PM_Dialog
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Last seen:1 day 6 hours ago
Staff
Joined:2018-02-08 11:03
Hi ahiggs,

Hi ahiggs,

Please check outAN-B-054: DA14585/586 Application Hardware Design Guidelinesdocument 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 availableAN-B-027: Designing Printed Antennas for Bluetooth Smart,但对于如何设计印刷天线。

Thanks, PM_Dialog