Home security products such as smoke detectors, intrusion detectors, etc. are often wirelessly connected, and also feature buzzers that produce audio alarms. This disclosure describes techniques to integrate the buzzer and the wireless antenna, thereby enabling more compact security products.
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Kuo, Jerry W.; Poole, David W.; Sutter, Andrew J.; and Li, Wei, "Integrated wireless slot antenna and piezo buzzer", Technical Disclosure Commons, (September 04, 2019)