0 Preface
Bluetooth is a radio technology that supports short-range communication (usually within 1Om) of the device. It can exchange wireless information between devices. Its working frequency range is 2.4~2.483 GHz. It is widely used in mobile. In communication equipment. Antennas are an essential component of the Bluetooth wireless system for transmitting and receiving electromagnetic energy. Since the current technology cannot integrate the antenna into the semiconductor chip, in addition to the core system chip in the Bluetooth module, the antenna is another key component that affects the transmission characteristics of the Bluetooth module. This paper presents the design of an inverted F antenna, which is small in size, simple in design, low in manufacturing cost and high in work efficiency, and is suitable for Bluetooth system applications.
1 antenna design
The inverted F antenna is an antenna developed at the end of the last century. It has the unique advantages of simple structure, light weight, conformal shape, low manufacturing cost, high radiation efficiency, and easy realization of multi-band operation. Therefore, in recent years, inverted F Antennas have been widely studied and developed.
The inverted F antenna is formed by adding an inverted L structure edb at the end of the vertical element of the inverted L antenna abc. It uses an additional edb structure to adjust the matching of the antenna and the feeder coaxial. The antenna has a low profile structure, and the radiation field has two polarizations, horizontal and vertical. In addition, due to its compact structure and equi-directional radiation characteristics, its good grounding design can effectively improve the working efficiency of the antenna. Figure 1 shows a typical inverted-F antenna structure. The antenna can be regarded as a short-circuited e-terminal, open-ended resonator at a, so the voltage at terminal a is the largest, the current is zero, the voltage at the e-terminal is zero, and the current is maximum. . Since the structure of the inverted-F antenna includes a grounded metal surface, the sensitivity to the grounded metal surface of the RF module can be reduced, making it ideal for use in system-on-chip. In addition, since the inverted F antenna only needs to use a metal conductor and an appropriate feed line to adjust the position of the short-circuit end of the antenna to the ground plane, the manufacturing cost is low and can be directly soldered to the PCB circuit board. Figure 2 shows the layout of the inverted F antenna on the board.
Whaylan portable power station, High capacity, high power, built-in lithium battery, long standby time, high conver-sion efficiency, easy to carry.Designed for comfortable handling, the WL-P300/600 is equipped with a top handle and the entire body is so light that even a small child can easily lift it. With its 311wh/540wh capacity, you can live off-grid anywhere, anytime, from RV camping to wilderness adventures, without fear of power outages.
Whaylan always adheres to the concept of "innovation drives development, science and technology leads the future", product research and development is quality oriented, efficiency-oriented, safety-oriented as a principle, creating a strong team, R&D experience, the company is rated as small and medium-sized scientific and technical enterprises, specialized new enterprises, high-tech enterprises.
Since its inception, the company has always adhered to the original intention of "allowing the world to use clean energy", dipped deep in the field of energy, electronic and electrical transformation, and is committed to providing smart energy management and other common solutions to households, industrial and commercial users and ground-based power plants with innovative technologies, excellent products and professional services.
In the context of the global energy revolution, Whaylan will continue to focus on the new business of energy equipment, research and innovation at all times, always close to the needs of users, and will strive to build a world-class green technology enterprise, create a new era of smart energy!
portabel power station,power station,camping power station,outdoor power station
suzhou whaylan new energy technology co., ltd , https://www.whaylanenergy.com