TWS headphones are very unique, two small headphones with left and right ears, with a charging box, and connect the phone or other Bluetooth audio device to it, the whole process is completely wirelessly connected, which is very convenient.
Over the cable headset to TWS true wireless headphones, it has brought convenience to many users, but the product form of the true wireless headset also puts a high requirements for supply chain manufacturers. Among them, important device master chips, power management ICs, wireless charging reception chips, charging box batteries, and headphone batteries are required to meet TWS earphone design requirements.
The TWS Headset Bluetooth Antenna As an important part of the Bluetooth module, it also plays an important role in the TWS headset. The design of the Bluetooth antenna, as well as the right level of the headset helps to increase the transmission quality of the Bluetooth communication, and then enhance the user’s actual experience experience.
In the current TWS headset, the relatively broad Bluetooth antenna is divided into four, which are PCB onboard antennas, FPC antennas, ceramic antennas, and LDS antennas. This time, I love Xi Fang will introduce the importance of antennas in the TWS headset, and how to choose three aspects when designing TWS headset, sharing the role, type and design selection of the TWS headset Bluetooth antenna.
First, the importance of TWS headset antennas
From the vintage radio to the current smart speaker, from “Big Brother” to the smartphone, from the traditional Bluetooth headset to TWS true wireless headset. The development of consumer electronics technology is an important firmware. With the birth of everything, it is more important to give smart home, smart car, smart wear equipment to each other. The function of one-machine manipulation is more important.
TRUE Wireless Stereo really wireless stereo headphones, main use methods are mobile devices such as mobile phones, computers, etc., and then transmit audio information to the headset, and decode output in the headphone side.
In this process, the Bluetooth antenna is required to act as a “tower” role in communication, and the task of sending and receiving. Therefore, in the TWS headset, the Bluetooth chip is complemented by the Bluetooth antenna, thereby achieving wireless transmission music playback, avoiding the shackles of the wire.
Second, TWS Headphones Bluetooth Antenna Introduction
The Bluetooth antenna is an important firmware for TWS headphones. The current development has been relatively mature, mainly with PCB onboard antenna, FPC, ceramics, and LDS. According to the appearance, frequency band requirements and cost of TWS headset, select the most suitable antenna type.
PCB onboard antenna
As the name suggests, the PCB board antenna is an antenna type directly drawn on the PCB board, which is applied to a single band board for Bluetooth modules, WiFi modules, ZigBee modules. In TWS earphones, due to volume limits, the onboard Bluetooth antenna application is relatively small.
Suppliers who do PCB plates can be designed to achieve, equivalent to the line portion of the plate.
Advantages: The PCB board antenna has no need to debug multiple debugging, and can be directly drawn on the PCB board without cost.
Disadvantages: The area is large, and the directional comparison is single. It is only suitable for a single band. The antenna consistency of different batches is relatively poor, and the anti-interference ability is poor.
FPC antenna
The FPC antenna is evolved from the PCB onboard antenna. Due to the limit of the TWS headset, the space on the internal motherboard cannot accommodate the antenna. The FPC antenna is equivalent to remove the antenna line from the PCB, using other external metals to do antenna, becoming a separate component. This can be better placed to the internal space of the TWS earphone.
Make soft boards, PCB board mills of flexible materials can be achieved.
Advantages: Suitable for most small electronic products, the frequency bands that can be done are also relatively abundant, with better performance, low cost.
Disadvantages: Each product needs to be subjected to separate debugging, artificial patch.
LDS antenna
The LDS antenna is a further upgrade of the FPC antenna. Although the FPC antenna has been able to greatly utilize the internal space of the headset, it still requires a flat plane to give it an attachment.
The LDS antenna is a laser direct molding technique, and the laser laser technique is used to form a metal antenna pattern directly in the bracket, cover, etc., which can be laser to the irregular surfaces in each of the headphones, further utilize the internal space of the headset.
Make laser processing, laser technology, and electroplated manufacturers can support.
Advantages: Full-directionality can be supported, strong acceptance ability.
Disadvantages: The cost is more expensive, and there is a special requirement for the external surface process materials.
Ceramic antenna
The ceramic antenna is another extensive antenna product in the Bluetooth module apparatus, which is named in the ceramic ceramic antenna and multilayer ceramic antenna.
Block-shaped ceramic antennas is to print the metal of the antenna on the ceramic fast surface, and the multilayer ceramic antenna can be printed on each of the ceramic dielectric layers according to the design, thereby narrowing the antenna size.
Advantages: Small size, easy to apply, low cost, good performance and only occupied space.
Disadvantages: The requirements for the clearance area require a higher direction, and the direction is required.
I learned from the past TWS earphone dismantling, due to volume limits, the PCB-board antenna applies relatively small, FPC, ceramics, and LDS antennas in the TWS headset, and has advantages and disadvantages. Brand vendors will choose according to their needs, and there is no fixed use type.
Third, how to choose a suitable antenna
In theory, from the cost consideration, PCB, FPC antenna cost is low, the ceramic antenna is moderate, the LDS antenna is more expensive; and in space use, the LDS antenna is most flexible, and it can take advantage of the internal space of the headset.
In terms of performance, the transmission and reception capability of an external antenna generally be better than the built-in antenna, and the TWS headset is designed by the built-in antenna design due to volume limits, and portability requirements. Performance is relatively similar, and it is also necessary to consider it in accordance with a variety of factors, and then select the appropriate antenna.
The design of the TWS headset Bluetooth antenna affects the transmission quality of Bluetooth communication, which in turn affects the actual use experience of the user. The selection of Bluetooth antennas has a wide variety of factors such as performance, frequency band, cost, and space. Only by considering the specific product, and using scenarios, choose the right antenna to exert the maximum performance of the product.
I love sound network summary
The actual use experience of the TWS headset requires many factors to superimpose each other, in order to show a perfect effect. The TWS Headphones Bluetooth Antenna As the main component, the TWS headset and the bridge between the TWS headset and the mobile device, providing a safeguard of the TWS headset Bluetooth connection, sound quality transmission quality.
Currently, the main application of the TWS headset is mainly included in the Bluetooth antenna products, including PCB onboard antennas, FPC antennas, ceramic antennas, and LDS antennas. Four products have advantages and disadvantages, need to be considered from many aspects of performance, frequency band, cost, and space, thereby choosing the most suitable antenna product, enhances the performance and competitiveness of the product.
TWS headphones are hot, quickly drive the upgrade of related industrial chains. The progress of the Bluetooth module, Bluetooth technology, antenna, and related technologies makes it possible to ensure the performance of the connection stability and sound quality. The current TWS headset has rarely developed the initial disconnect, and the problem of being damaged by the sound quality and the problem of intermittent playback, which effectively enhanced the actual use experience of the user.
2021 (Spring) Asia Bluetooth headset exhibition related antenna exhibitors, welcome to exchange discussion:
A20: Shenzhen Pengjiao Industrial Technology Co., Ltd.
B05: Yucai Technology Co., Ltd.
C05: Shenzhen Senkai Electronics Co., Ltd.
PCB onboard antenna
FPC antenna
LDS antenna