Abstract: An antenna structure includes a border frame, a first feed portion, and a second feed portion. The border frame includes an end portion, a first side portion, and a second side portion. The border frame defines a first gap, a second gap, a first slot, and a second slot. The first gap and the second gap are disposed in the end portion. The first slot is disposed in the first side portion. The second slot is disposed in the second side portion. The first gap, the second gap, the first slot, and the second slot divide the border frame into two radiating portions. The first feed portion and the second feed portion are electrically coupled to the two radiating portions and supply current to the two radiating portions respectively.
August 16, 2019
Date of Patent:
June 22, 2021
Chiun Mai Communication Systems, Inc.
Yun-Jian Chang, Jung-Chin Lin, Yen-Hui Lin
Abstract: A low power consumption LED constant current drive circuit includes a power source input circuit, a constant current source circuit, an output voltage detection circuit, and a reference current control circuit, having the advantage of lower power consumption.