Multiband-antenna-for-rtk

Multi-band antenna for RTK application

With the demands for high precision position, it increases the needs of received GNSS satellites’ number,making the trend of receiving multi-band GNSS system. Choosing a correct antenna is hugely important since antennas are the main interface between the GNSS space segment and the user, especially on multi-band system.

AGR6302G is designed for RTK applications, covering GPS, BDS, Galileo, GLONASS, IRNSS and QZSS system, details please refer to table 1. The antenna features stable signal quality and more angle receiver on the practical conditions. It employs the stack four feeds antenna architecture with hybrid to achieve the multi-band operation/ lower axial ratio/wider half power beam width and excellent right hand circular polarization.

With the newly architecture, the active part has two stages, one level filter and also one LNA for respective lower/higher band path. And then, the combiner of dual filter and the second level LNA output the RF gain to receiver. It provides excellent noise figure/ RF linear and LNA gain and out band rejection, resulting in good signal/noise ratio and anti-interference. It is housed in a compact, industrial-grade waterproof mount enclosure, the antenna can be installed almost anywhere allowing for greater flexibility. Using SMA connector fit together with GNSS module or receiver to show the dual band RTK performance.

Mechenical specs

Items	Specs
Frequency Range	GPS L1/L2/L5 BDS B1/B2/B3 GLONASS G1/G2 GALILEO E1/E5a/E5b
Bandwidth	≥100MHz
Highest benefit	≥4 dBic typ (@70*70 Ground)
Standing wave ratio	≤2.0
Polarization mode	Right-hand circular polarization(RHCP)
Axle ratio	≤3 dB

Environmental

Item	Specs
Temperature(Typical)	-40℃~+70℃
Temperature(Max)	-40℃~+85℃
Humidity	10 to 95% RH

Electrical performance

The electrical performance of the samples described in this document was measured under specific conditions:

• temperature: 25±15℃;
• humidity: 65±20%RH;
• instrument power setting: 1uW;
• air pressure: (0.96±0.1) X 105 Pa;

all experimental data were obtained by measuring with a block antenna connected to a grounding plate measuring 70*70mm, inside a microwave darkroom.

Antenna（Patch）Specs

Items	Specs
Bands	BDS B1 GPS L1/L2/L5 GLONASS G1
Bandwidth	≥100MHz
最高效益	≥4 dBic typ (@70*70 Ground)
驻波比	≤2.0
极化方式	右旋圆极化(RHCP)
顶点轴比	≤3 dB

低噪放（LNA）性能指标

参数		规格
增益	BDS B1 GPS L1 GLONASS G1 GALILEO E1	27.0±3dB
	BDS B2/B3 GPS L2/L5 GLONASS G2 GALILEO E5a/E5b	29.0±3dB
噪声系数		2.0 dB typ
输入驻波		≤2.0
输出驻波		≤2.0
电压		DC 3.0～5.0V
电流		≤60mA (@3.3V)
阻抗		50Ω