Patent ID: 9445483
Filing Date: 2016-09-13
CPC Classification: F21K,F21V,F21Y,H01Q,H05B

Claim Text:
1. A lighting device comprising: a heat sink; a light emitter thermally connected to the heat sink, a communication circuit being coupled to the heat sink for transmitting and/or receiving a communication signal, wherein the heat sink being electrically conductive and comprising an opening having specific dimensions for constituting an aperture antenna tuned for a particular frequency for directionally transmitting and/or receiving the communication signal of the particular frequency via the heat sink, wherein the communication circuit is connected to a primary radiator at least partially surrounded by the heat sink and transmitting and/or receiving the communication signal at the particular frequency for inducing an electrical field representing the communication signal into the aperture antenna, and the electrical field across the opening causes the opening to re-emit the communication signal directionally according to the radiation characteristic of the aperture antenna, wherein an outer rim of the opening of the aperture antenna has a dimension equal to N*(lambda/4), N being an integer number and lambda being the wavelength of the communication signal of the particular frequency.