Analysis of the challenges facing the built-in antenna of mobile phones

Users want the phone to use an internal antenna. However, this is not as simple as imagined. For every mobile phone user, a sudden interruption is always irritating during a call, and if the reception is not good, the user may feel uncomfortable. For the RF performance of mobile phones, the performance of the antenna is extremely important. Network operators often measure the transmission and reception performance of mobile phones. If the performance is not up to standard, such mobile phones simply cannot be sold because they are performing poorly on the Internet.

Poorly performing antennas also affect power consumption and shorten battery life. A less efficient antenna produces less power at the base station and the closed loop power control system needs to compensate for it. The base station will require the handset to transmit more power. This means that the antenna affects the power consumption of the phone during a call.

It is also important that the style of the mobile phone is comfortable and safe to use. If you have a choice, you will choose a mobile phone with integrated antenna, because putting such a phone in your pocket will be more comfortable than using an external antenna, and the style of the case can be designed to be more attractive. people. Mechanically, the built-in antenna is stronger and more reliable. However, some new features of the phone, such as camera functions, make the phone more complicated in terms of electrical, and there is less space left for the antenna after adding new features. The challenge for all mobile phone designers is how to cater to the needs of consumers and incorporate the built-in antenna into a stylish mobile phone.

There is an important issue. Mobile phone designers must first ask themselves: Can you incorporate a performance-qualified built-in antenna into your own mobile phone? In most cases, as long as there is a suitable place to put the antenna, then the answer is yes. In particular, it is important to make room for the antenna. Mobile phone designers must be willing to work with antenna designers to solve all possible problems. Since the antenna is inside the mobile phone, there is often a problem of mutual interference and cross-coupling between the antenna and other devices. The difficulty of using the built-in antenna in a mobile phone is much more than using an external antenna. However, if the method is correct, then using the built-in antenna in the phone is both efficient and efficient.

For mobile phone designers, the use of built-in antennas on mobile phones requires addressing three main issues: first, where the antennas should be placed; second, the space that the antennas can use; and third, how to arrange them in mobile phones. Other components to avoid problems. Users want the phone to use an internal antenna. However, this is not as simple as imagined. For every mobile phone user, a sudden interruption is always irritating during a call, and if the reception is not good, the user may feel uncomfortable. For the RF performance of mobile phones, the performance of the antenna is extremely important. Network operators often measure the transmission and reception performance of mobile phones. If the performance is not up to standard, such mobile phones simply cannot be sold because they are performing poorly on the Internet.

Poorly performing antennas also affect power consumption and shorten battery life. A less efficient antenna produces less power at the base station and the closed loop power control system needs to compensate for it. The base station will require the handset to transmit more power. This means that the antenna affects the power consumption of the phone during a call.

It is also important that the style of the mobile phone is comfortable and safe to use. If you have a choice, you will choose a mobile phone with integrated antenna, because putting such a phone in your pocket will be more comfortable than using an external antenna, and the style of the case can be designed to be more attractive. people. Mechanically, the built-in antenna is stronger and more reliable. However, some new features of the phone, such as camera functions, make the phone more complicated in terms of electrical, and there is less space left for the antenna after adding new features. The challenge for all mobile phone designers is how to cater to the needs of consumers and incorporate the built-in antenna into a stylish mobile phone.

There is an important issue. Mobile phone designers must first ask themselves: Can you incorporate a performance-qualified built-in antenna into your own mobile phone? In most cases, as long as there is a suitable place to put the antenna, then the answer is yes. In particular, it is important to make room for the antenna. Mobile phone designers must be willing to work with antenna designers to solve all possible problems. Since the antenna is inside the mobile phone, there is often a problem of mutual interference and cross-coupling between the antenna and other devices. The difficulty of using the built-in antenna in a mobile phone is much more than using an external antenna. However, if the method is correct, then using the built-in antenna in the phone is both efficient and efficient.

For mobile phone designers, the use of built-in antennas on mobile phones requires addressing three main issues: first, where the antennas should be placed; second, the space that the antennas can use; and third, how to arrange them in mobile phones. Other components to avoid problems.

If you understand the difficulty of improving product integration, it may be helpful for design. In general, there are two antennas to choose from: balanced antennas and unbalanced antennas. The balanced antenna works independently and is independent of the surrounding environment. Unbalanced antennas must be grounded. Unbalanced antennas generate current to ground and, in total radiated power, include the power produced by these currents. A very good example is the monopole antenna that is often used in cars. Its body is ground.

The performance of the antenna is also related to its size. The size of the antenna is expressed in terms of wavelength. The ground of the unbalanced antenna is part of the effective size, so the actual antenna size can be made smaller.

The antenna of a mobile phone is an example of an unbalanced antenna. Their ground is the metal structure in the mobile phone, which is generally the printed circuit board and the metal plated parts around it. This is what we often call a printed circuit board assembly. Unbalanced antennas are often used in mobile phones because of their small size. For low-band mobile phones, such as GSM900 mobile phones and CDMA800 mobile phones, when used in wavelengths, the space left in the mobile phone to the antenna is small. Therefore, it is impossible to install a high-efficiency balanced antenna in such a small space, so it is necessary to use an unbalanced antenna.

For higher frequency handsets, the location limits the antenna much less. For example, the GSM1800 has half the wavelength of GSM900, so the space left for the antenna is larger. A balanced antenna can be used in a wide-band handset. Recently, the built-in antenna of the WCDMA mobile phone and the external antenna of the GPS have used balanced antennas. The advantage of this is that the antenna does not generate a large current flowing through the phone. That is to say, the design of the antenna and the design of the mobile phone are not so great.

However, the problem is that most mobile phones must be able to be used in both high and low frequency bands. That is to say, as long as the high frequency antenna is incorporated into the low frequency antenna, it is sufficient to make them an unbalanced antenna.

Type of antenna

Many types of antennas have been used in mobile phones. In general, they can be divided into two categories. The first type of antenna is very similar to a monopole antenna. External antennas such as normal-mode helicals, meaners antennas, and whip antennas fall into this category. Recently, such antennas have been placed inside mobile phones, but such antennas are not too common. They don't work when they have a ground underneath them, so if the printed circuit board underneath it has a lot of components, it won't work.