Welcome to the website of Yongshun Technology Co.,Ltd.!Today is:
搜索
language
中国
韩国
韩国
韩国
韩国
韩国
News Center
Check category

Active/passive GPS antennas are used in the selection method and use suggestions of GPS positioning products

  • Categories:News Center
  • Time of issue:2021-02-01 14:08
  • Views:

(Summary description)The typical application block diagram of GPS products is shown in the figure below. GPS signal reception will use receiving antennas. Most GPS antennas use ceramic antennas, including passive antennas and active antennas. The active antenna has a built-in LNA, which has better radio frequency reception performance, but it is more expensive than passive antennas. This article is recommended Mai Jieke Technology of MGDAM active GPS antenna and MGDAS passive GPS antenna design.

Active/passive GPS antennas are used in the selection method and use suggestions of GPS positioning products

(Summary description)The typical application block diagram of GPS products is shown in the figure below. GPS signal reception will use receiving antennas. Most GPS antennas use ceramic antennas, including passive antennas and active antennas. The active antenna has a built-in LNA, which has better radio frequency reception performance, but it is more expensive than passive antennas. This article is recommended Mai Jieke Technology of MGDAM active GPS antenna and MGDAS passive GPS antenna design.

  • Categories:News Center
  • Author:
  • Origin:Maijie Technology
  • Time of issue:2021-02-01 14:08
  • Views:
Information

The typical application block diagram of GPS products is shown in the figure below. GPS signal reception will use receiving antennas. Most GPS antennas use ceramic antennas, including passive antennas and active antennas. The active antenna has a built-in LNA, which has better radio frequency reception performance, but it is more expensive than passive antennas. This article is recommended Mai Jieke Technology of MGDAM active GPS antenna and MGDAS passive GPS antenna design.

                  

The active GPS antenna consists of a ceramic antenna and a low-noise amplifier. Taking MGDAS1575R as an example, the electrical performance parameters of the ceramic antenna are as follows:

Taking MGDAM1575E2N0 as an example, the performance parameters of the low noise amplifier are as follows:

      

MGDAM active series GPS antennas have several common size specifications to choose from. When designing the product, you can choose flexibly according to the product’s reserved antenna space and receiving performance requirements, but the antenna size can also be customized according to customer needs, and the interface form is also It can be flexibly customized according to actual needs, such as IPEX interface, manual welding, SMA and other common interface forms. MGDAS passive series GPS antennas also have several commonly used specifications, which can be flexibly customized according to actual applications. Compared with an active antenna, a passive antenna has no built-in LNA and the antenna gain is usually a few dBi, but the larger the antenna size, the greater the antenna gain. Passive antennas are generally used in products with GPS interface chips or modules with built-in LNAs. When designing, pay attention to whether the chip or module supports passive antenna design.

Regarding how to choose GPS active and passive antennas, take Zhongke Micro AT6558R GNSS signal receiving chip antenna selection as an example to illustrate:

AT6558R supports active antenna design and passive antenna design, and requires external gain greater than 18dB and less than 35dB. If AT6558R is used with Zhongke Micro LNA chip AT2659 (gain 23dB), you can choose the passive series GPS antenna design of Maijie, which can meet the usage requirements; if it is not equipped with an external LNA, you need to choose the Maijie active series GPS antenna. design.

Suggestions on the use of GPS antennas on products:
1. The antenna feed point to the chip or module antenna input GPS_ANT PIN line should be as short as possible.
2. Matching circuit; if the antenna feed point is very close to the GPS_ANT PIN of the chip or module, no matching circuit is required. If the GPS antenna is far away from the module GPS_ANT PIN due to the structure and other reasons, it is recommended to reserve a pi matching circuit. The wiring between the GPS_ANT PIN of the module and the GPS antenna pad must be controlled by 50 ohm characteristic impedance; if it is a multilayer board, it is recommended that the impedance line go through the L1 layer, and the L2 layer is hollowed out and referenced to the L3 ground.

3. Do not run wires under the antenna and do copper leakage treatment as the reflective surface of the antenna; see the following figure:

4. There should be no interference sources around the antenna, especially DCDC and other devices; in addition, there should be no metal components higher than the GPS antenna around the antenna.

5. The choice of active GPS antenna gain must match the back-end LNA gain. Generally, it is not recommended that the active antenna gain exceed 29dBm, otherwise the signal may be oversaturated and may cause self-excitation.

Keyword:

Scan the QR code to read on your phone

Follow Us:

Home         Message

About         Contact

News         ENGLISH

Product      Japanese

 

Follow us
qr Chinese
qr English
qr Japanese

Contact us

Shenzhen Xinxie Office
Contact number: 18998036969
(Yang Sheng)
Contact email: benson@szxinxie.cn
Taiwan Jie Shun Office
Contact number: 09-8166-0710
(General Manager-Yang Fengyuan)
Contact email: kent@yong-shun.com.tw

Company website: https://www.rfxinxie.com Company Address: No. 5, Alley 18, Lane 1, Renxing Road, Hukou Township, Hsinchu County

 Copyright © 2019 Xinxie Technology (Shenzhen) Co., Ltd.  粤ICP备20005589号

Username used for comment:
Messages
Description:
验证码