Smart Antenna HX-ME404A

The HX-ME404A is an embedded multi-band, multi-constellation smart antenna developed by Harxon. Combining Harxon’s world-leading antenna technology with Unicore’s full-constellation, full-frequency RTK positioning module (UM980), the HX-ME404A delivers precise positioning performance in a compact and integration-ready structure. It provides single-point meter-level accuracy, DGPS sub-meter-level accuracy, and RTK centimeter/millimeter-level accuracy, making it ideal for robotic lawn mowers and UAV applications that require precise location and heading.

Integrated Design and Compact Form Factor

The compact smart antenna, weighing ≤15g and measuring Ø46\*H19.2mm, greatly reduces the weight of UAVs and features low power consumption. Additionally, the antenna and board are well compatible with each other, simplifying the development process and reducing costs for engineers, which greatly improves the overall reliability of UAVs.

Key Features

• Smart helix antenna integrated with RTK module
• Small size, lightweight, and integration-ready structure
• Supports GPS, GLONASS, Galileo, BeiDou, QZSS, and SBAS
• Strong anti-interference performance
• Stable phase center guarantees millimeter-level positioning accuracy

Precision-Tuned OEM GNSS Antenna

The HX-ME404A is equipped with an ultra-low-profile Harxon helix antenna designed for high-precision positioning of UAVs. It excels in satellite signal tracking for GPS, GLONASS, Galileo, BeiDou, QZSS, and SBAS. The antenna provides excellent axial ratios, enabling superior multipath mitigation and precise phase center performance.

High-Performance RTK Positioning Module

The HX-ME404A is integrated with Unicore’s full-constellation, full-frequency RTK positioning module UM980, which integrates RF, baseband, and high-precision algorithms. It can simultaneously track multiple frequencies of all GNSS systems, enabling high-precision RTK positioning.

Strong Anti-Interference Performance

The HX-ME404A offers superior positioning performance in challenging environments. The antenna equips a robust pre-filtered LNA that features excellent out-of-band interference rejection, and the module features 60 dB narrowband anti-jamming and advanced jamming detection technology, effectively avoiding signal disconnection risks when UAVs are operated near power towers and electric power lines.

Parameter	Details
Signal Received	GPS (L1C/A, L2C, L2P(Y), L5)
	BDS (B1I, B2I, B3I, B1C, B2a)
	GLONASS (G1, G2)
	GALILEO (E1, E5a, E5b)
	QZSS (L1C/A, L2C, L5)
	SBAS (L1C/A)
Nominal Impedance	50Ω
Polarization	RHCP
Axial Ratio	≤3dB
Azimuth Coverage	360°
Output VSWR	≤2.0
Peak Gain	3dBi
LNA Gain	23±2dB
Noise Figure	≤2dB
Passband Ripple	±2dB
Positioning Module	UM980
Single Point Accuracy	Horizontal: 1.5m, Vertical: 2.5m
DGPS Accuracy	Horizontal: 0.4m, Vertical: 0.8m
RTK Accuracy	Horizontal: 0.8cm+1ppm, Vertical: 1.5cm+1ppm
Timing Accuracy (RMS)	20ns
Velocity Accuracy (RMS)	0.03m/s
Channels	1408
Time to First Fix	Cold Start <30s
Initialization Time	<5s (Typical)
Initialization Reliability	≥99.9%
Data Refresh Rate	50Hz Positioning
Differential Data	RTCM 3.X
Data Format	NMEA-0183, Unicore
Operation Voltage	5V
Power Consumption	500mW (Typical)
Operating Temperature	-40°C to +70°C
Storage Temperature	-40°C to +70°C
Humidity	95% Non-Condensing
Dimensions	Ø46 x H19.2mm
Weight	≤15g
Connector	GH1.25-6P
Mounting	4 x M1.6 Screws
Interface Pin Order
Pin 1	GND
Pin 2	TX1
Pin 3	RX1
Pin 4	RX2
Pin 5	TX2
Pin 6	VCC

Download Data Sheet