Introduction

In the past decade, Internet technology has made explosive progress. We can find the information we need in the Internet world and our daily lives have become more dependent on him. Most people's daily routines have been integrated with the online world. Therefore, wireless network connection has become a necessary way in our lives, that is, all portable devices must have wireless communication capabilities. Furthermore, the Internet of Things is bound to become a focus of the development of the technology industry. Eventually, each object will be connected through wireless communication devices. In the competitive environment of the wireless industry, a miniature antenna technology can make portable devices thinner, smaller and lighter, making your products more competitive, and allowing your products to win in this vast market.

Observing the development trajectory of electronic products in the past, we can know how to develop key components in advance according to the needs of new-generation products, immediately launch the components required for new products, or provide replacement components with superior performance, which will enable this new product to be on the market Have a comparative advantage and increase competitiveness. As far as wireless communication products are concerned, antenna products or technologies are key components that occupy an important position. In order to have a stable Internet access capability and data download speed, personal mobile devices need an antenna device with superior performance to strengthen their signal transmission and reception capabilities, so that they can easily access the Internet at any time without obstacles. The unique patented Chip Antenna technology of Wingye Technology can provide customers with high-efficiency micro-chip antennas and improve the efficiency of customers' wireless communication products.

Take WiFi AP Router, which is very important for network connection, as an example. Most of the commercially available models still use external dipole rod antennas, which not only affects the design, takes up a large volume, and is inconvenient to use , The cost of materials and assembly are also very high. Especially for pocket routers used by business people, if a stick antenna needs to be attached, it won't match.

Take tablet PCs as an example, FPC antennas are still widely used. However, to use the FPC antenna, the FPC antenna must be manually assembled to the case of the tablet computer, and two shrapnels are welded on the motherboard to electrically connect the FPC antenna to the motherboard. This approach is not only high in total cost, but also poor stability of the manually assembled FPC antenna. But for the chip antenna of Yongye, it can be completed only by using the SMT process to print the chip antenna on the motherboard, which has the characteristics of convenience, stability and low total cost.

How to design a built-in antenna

The antennas of smart phones, tablet computers, handheld devices and other products are still mainly built-in antennas. If you want to design the antenna as a built-in antenna, there are currently several forms to choose from, including: sheet metal stamped and formed antenna, printed circuit board (PCB) or flexible board (FPC) antenna, LDS antenna and chip antenna. Mold stamping and forming metal antennas requires the development of metal processing and forming molds in production. Mold opening is not only expensive but also takes a long time, which is very unfavorable for the cost and schedule control of new product development. Moreover, whether it is an antenna made of a printed circuit board, a stamped metal antenna or an LDS antenna, it must be manually assembled into the mobile device. Not only is the labor cost high, but the yield rate of manual assembly is relatively unstable. Control is more difficult. Moreover, whether it is a stamped metal antenna or an LDS antenna, its size is quite large, which does not meet the trend of personal portable products that are light, thin and short. Therefore, chip antennas with the advantages of light, thin, short and small have become another attractive choice. The design of chip antennas is mainly based on monopole (PIFA) antennas and loop (loop) antennas.

What are the main problems that the built-in antenna will encounter in practical applications? We give examples as follows:
1. The influence of the human body on the characteristics of the
antenna 2. The relationship between antenna size and efficiency
3. The influence of the radiation field type on the effective signal transmission ability
4. Whether it is necessary to make a customized antenna for each model
5 .Cost of production

And Yongye’s patented chip antenna adopts an improved loop antenna design principle and has excellent performance in the above-mentioned problem areas. How Wing Ye’s chip antenna overcomes the above problems and compares it with other types of antennas is described as follows:

1. The effect of the human body on the antenna characteristics when the human body is close to the antenna's
reactance near field is divided into two types: electric field and magnetic field. The human body is a dielectric, which has a greater impact on the electric field effect of the reactance near field, which will cause the antenna feed impedance to change. Most chip antennas on the market currently use the design principles of monopole antennas or PIFA antennas. The antenna reactance has a strong electric field effect in the near field. When the human body is close to the antenna (for example, holding a mobile phone with a hand), the antenna's performance will be affected. Subject to a more significant impact. While the chip antenna of Wing Industry Technology adopts the improved loop antenna design principle, the antenna reactance has a higher proportion of the magnetic field effect in the near field, relatively reducing the influence of the electric field effect, thus reducing the human body's influence on the antenna efficiency.

2. The relationship between antenna size and efficiency
Yongye’s patented chip antenna uses the metal around the chip antenna to increase the antenna’s radiation efficiency. In other words, although the size of the chip antenna is reduced to a small size, only the metal on both sides of the antenna With sufficient length, it can still have a fairly good radiation efficiency. However, for PIFA antennas generally made of LDS or FPC, the length of the antenna's radiator should reach a quarter of a wavelength and the antenna body should be as far away from the metal as possible, so that the radiation efficiency will be better. But judging from the current development trend of 3C products, thinner and thinner is the main trend. PIFA antennas will get closer and closer to the circuit board, which will affect the radiation efficiency of the antenna unless the antenna is covered on the circuit board. All the metal layers are removed, otherwise the antenna efficiency will be greatly reduced. The chip antenna invented by Yongye overcomes the above-mentioned problems. Even if the antenna size is reduced to 3.2*1.6*0.5 (mm), it can still maintain high radiation efficiency. The launch of this chip antenna was immediately enthusiastically adopted by major international manufacturers.

3. The influence of the radiation field pattern on the signal transmission ability.
The antenna designed with PIFA structure is used. The main direction of the radiation field pattern will point to the direction of the grounded metal. Therefore, the antenna engineer cannot easily adjust the antenna design shape to change the direction of the radiation field pattern. , The main radiation direction leading to the radiation field pattern is not necessarily the direction required by the product. For example, a GPS antenna needs to be built on a smart phone. Generally speaking, because the lower end of the phone will be designed with the main antenna of LTE/3G, the GPS antenna will be designed on the top of the smart phone. If the PIFA structure is used to design it, The main radiation direction of the radiation pattern will be downward, that is, toward the ground, but GPS satellite signals come from the sky, so the effective radiation gain that can be used to receive GPS signals is actually very low. Wingye’s chip antenna restricts the current flow of the antenna to the periphery of the chip antenna, so that the radiation pattern can be easily designed to point to the sky above, which is the direction of the satellite signal source. Therefore, the effective radiation gain can be greatly increased. Increase, in other words, the signal receiving capability of GPS can be greatly improved.

4. Whether it is necessary to make a customized antenna for each model.
The basic physical characteristics of the antenna, the location of the antenna and the surrounding environment, have a great impact on its electrical characteristics, so every 3C product antenna needs a customer Systematic production will cause problems such as a long development schedule, high inventory pressure, and high cost. However, Wingye’s chip antenna has an exclusive FM component design. When the same chip antenna is installed in different institutional environments, even if the antenna’s resonance frequency is shifted, the FM component can be easily used to adjust the resonance frequency to the product. The required frequency band. Product development and manufacturing units only need to prepare a single antenna element to meet the development needs of different products. In the product development process, there is no need to repeatedly fine-tune the antenna. Therefore, the antenna development process becomes very simple, the development time period can be greatly shortened, and the inventory cost and manufacturing cost can also be significantly reduced.

5. Production cost The production cost of the
antenna can be analyzed from two levels, one is the direct cost, and the other is the indirect cost:

1. Direct cost:

Compare the commonly used LDS antennas, FPC antennas and chip antennas:

a. The material of LDS is more expensive and the manufacturing process is more complicated. Its price has always been the most expensive of all antenna types.
b. The cost of the FPC antenna must include the antenna body, two shrapnels, and assembly costs (manual assembly and printing costs) Although its total cost is cheaper than LDS, it is still more expensive than chip antenna.
c. The chip antenna is completed as long as the antenna is printed on the circuit board using the SMT process. There is no need for other manual assembly and shrapnel, and its total cost is the lowest.

2. Indirect costs:

In the development process of any electronic product, it is inevitable that the mechanism or structure needs to be modified at any time. Therefore, like LDS antennas and FPC antennas, the antenna design must be changed as the mechanism changes, that is, the antenna must be re-made, leading to the development. The growth of the process, so the development cost is bound to rise. However, if you use Wingye’s chip antenna, the same antenna standard product (single part number) can be used in various products. There is no need to redesign the chip antenna due to changes in mechanism or structure, and the layout of the circuit board does not need to be changed. This not only shortens the development time, but also reduces the relative overall development cost. After entering mass production, inventory only needs to prepare antenna standard products with a single part number, and there is no need to prepare antennas with different material numbers for different models. The complexity and cost of inventory management can be significantly reduced, and there is no need to worry about the occurrence of sluggish materials. .