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

Kuo, Jerry W.

Li, Wei

Poole, David W.

Sutter, Andrew J.

English

Technical Disclosure Common

Technical Disclosure CommonsDefensive Publications SeriesSeptember 04, 2019Integrated wireless slot antenna and piezo buzzerJerry W. KuoDavid W. PooleAndrew J. SutterWei LiFollow this and additional works at: https://www.tdcommons.org/dpubs_seriesThis work is licensed under a Creative Commons Attribution 4.0 License.This Article is brought to you for free and open access by Technical Disclosure Commons. It has been accepted for inclusion in Defensive PublicationsSeries by an authorized administrator of Technical Disclosure Commons.Recommended CitationKuo, Jerry W.; Poole, David W.; Sutter, Andrew J.; and Li, Wei, "Integrated wireless slot antenna and piezo buzzer", TechnicalDisclosure Commons, (September 04, 2019)https://www.tdcommons.org/dpubs_series/2464Integrated wireless slot antenna and piezo buzzer ABSTRACT 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.  KEYWORDS ● Home security ● Security camera ● Smoke detector ● Internet-of-Things (IoT) ● Piezo buzzer ● Slot antenna ● Piezo disk BACKGROUND Home security products such as smoke detectors, intrusion detectors, etc., internet-of-things (IoT) products, and health-monitoring products are often wirelessly connected, and also feature buzzers that produce audio alarms. To achieve compactness, the buzzers are made using piezo disks, e.g., disks that vibrate to produce sound when electrically excited. Wireless connectivity is provided by a wireless modem connected to an antenna, e.g., using Wi-Fi. The antenna typically takes up a separate volume which can limit the compactness of the home security product.    2Kuo et al.: Integrated wireless slot antenna and piezo buzzerPublished by Technical Disclosure Commons, 2019DESCRIPTION  Fig. 1: Operation of a piezo buzzer, and proper placement of a slotted antenna therein Fig. 1 illustrates the operation of a piezo buzzer. Fig. 1(A) illustrates a side view of a quiescent piezo buzzer. An electrical element (102) is coupled to a piezo disk (104). Fig. 1(B) illustrates the generation of sound waves from a piezo disk. The electrical element impresses an alternating voltage onto the piezo disk, causing the piezo disk to vibrate and produce sound waves. The central section of the piezo disk (106), marked in blue, is of importance to the production of sound. The peripheral regions of the disk (108), marked in red, are of lesser importance to the production of sound. The techniques of this disclosure leverage the peripheral regions to place a slotted antenna therein for wireless communication. 3Defensive Publications Series, Art. 2464 [2019]https://www.tdcommons.org/dpubs_series/2464 Fig. 2: A slotted antenna integrated onto a piezo disk Fig. 2 illustrates the integration of a slotted antenna onto a piezo disk, per techniques of this disclosure. A C-shaped slot (204) is cut through the periphery of the piezo disk (202). The C-shaped slot acts as a radio-frequency slotted antenna. Since the piezo buzzer has no coil and no magnetic field (unlike a conventional speaker) and is not a significant emitter of radio-frequency energy, it does not interfere with the operations of the slotted antenna. Further, the width of the slot can be adjusted to achieve changes in resonant (audio) frequency. For example, wider widths correspond to slightly higher resonant frequencies (as compared to slot-less piezo disks).  Fig. 3: Piezo buzzers within their cavity resonators, and proper placement of the slot antenna 4Kuo et al.: Integrated wireless slot antenna and piezo buzzerPublished by Technical Disclosure Commons, 2019 Fig. 3 illustrates types of cavity resonators used to house piezo buzzers. Fig. 3(A) illustrates in cross-section an edge-supported piezo buzzer, in which the piezo disk (304a) is supported at its edges while being coupled to an electrical element (306a) and housed in a resonant cavity (302a). Fig. 2(B) illustrates in cross-section a nodal-supported piezo buzzer, in which the piezo disk (304b) is suspended within a resonant cavity (302b) while being coupled to an electrical element (306b). In either case, the boundaries of the cavity, marked in red, are left undisturbed, so as to resonate properly at the frequency of the piezo disk.   Fig. 4: Placement of the slotted antenna within a nodal-supported piezo buzzer   Thus, as illustrated for example in Fig. 4, the slot antenna can be placed in the purple region of the piezo disk of nodal-supported type, with the antenna pigtail (a cable connecting the source of the radio-frequency energy to the antenna), shown in yellow, being connected as illustrated. The black and red cables are electric inputs to the piezo disk for the purpose of producing sound. 5Defensive Publications Series, Art. 2464 [2019]https://www.tdcommons.org/dpubs_series/2464 Fig. 5: A wireless antenna integrated with a piezo buzzer  Fig. 5 illustrates a wireless antenna integrated with a piezo buzzer. Cut through the piezo disk (502) is a wireless slot antenna (504). The antenna is fed by radio-frequency energy routed via an antenna pigtail (506), while the piezo buzzer is electrically excited via electrical leads (508).  CONCLUSION This disclosure describes techniques to integrate a piezo buzzer with a wireless antenna, enabling more compact Internet-of-Things products, including, e.g., security camera, intrusion detection device, etc. 6Kuo et al.: Integrated wireless slot antenna and piezo buzzerPublished by Technical Disclosure Commons, 2019

Integrated wireless slot antenna and piezo buzzer

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Integrated wireless slot antenna and piezo buzzer

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