1.Core Principle of Receive Only Antenna: Acquisition of Weak Satellite Signals
A Receive Only antenna is essentially a high-gain directional receiving antenna , and its core principle is based on the electromagnetic wave reflection and focusing principle and the reciprocity principle.
The electromagnetic waves (C-band/Ku-band) emitted by the satellite propagate in the form of parallel waves .
The parabolic reflector focuses the dispersed electromagnetic waves to a focal point , and the low-noise block downconverter (LNB) converts the radio frequency signal into an intermediate frequency signal at the focal point, which is then transmitted to the receiver via a feeder.
Reciprocity principle: The gain, and polarization characteristics of an antenna are completely consistent in the receiving and transmitting states, but a single receiving antenna only operates in receiving mode.
2.Typical Structure of a Receive Only Antenna: Four Core Components
A complete Receive Only antenna system consists of a reflector, a support frame, a low-noise block downconverter (LNB), and a feed. It has a simple structure but requires high precision.
Reflector (dish panel ) : Parabolic shape, mostly made of steel plate/aluminum alloy/fiberglass . The larger the diameter, the higher the gain and the stronger the ability to receive weak signals .
Bracket and base: Supports the reflector and allows adjustment of the azimuth (horizontal rotation), elevation (vertical angle), and polarization angle (LNB rotation) to ensure precise alignment with the satellite.
LNB (Low-Noise Block downconverter) : The core receiving component, installed at the focal point of the reflector, responsible for signal amplification, down-frequency reduction, and polarization matching . It is available in single-polarization/dual-polarization and C-band/Ku-band.
Feeder (coaxial cable) : Transmits intermediate frequency signals. It needs to be waterproofed and shielded to avoid signal attenuation.
3. Receive Only Antenna Selection Guide:
Frequency band selection (most crucial)
Ku band (10.7 – 12.75 GHz): Small antenna diameter , strong signal, easy to install, suitable for receiving domestic satellite TV and HD channels.
C-band (3.4 – 4.2 GHz) : Stable signal, strong resistance to rain attenuation, requires a large diameter antenna (1.5m or more), suitable for remote areas and meteorological/communication data reception.
Antenna diameter
Weak signal in remote areas: 1.2m – 1.5m (Ku/C band)
Engineering-grade reception: 2m and above (C-band)
Gain and Polarization
Gain is measured in dBi. A 1m diameter Ku antenna has a gain of approximately 38dBi . The higher the gain, the stronger the receiver sensitivity.
Polarization: horizontal (H) / vertical (V) . The polarization angle of the LNB must match the polarization of the satellite signal; otherwise, the signal quality will be greatly reduced.
4. Installation and Debugging of Single Receiver Antenna
Site selection (a key prerequisite)
There are no obstructions (trees, buildings, power lines) in front , guaranteeing an unobstructed view .
Keep away from strong electromagnetic interference (base stations, microwave ovens, high-voltage power lines).
Installation Steps
( 1 ) Assemble the reflector and bracket, and fix the base (wall/ground) to ensure it is strong and wind-resistant.
( 2 ) Install the LNB: fix it at the focal point, with the feed port facing the reflector , and connect the F head to the feed line.
( 3 ) Feeder connection: Connect one end to the LNB and the other end to the receiver, and make sure to waterproof and seal it.
Core debugging: Aligning with the satellite
( 1 ) Azimuth angle : Horizontally rotate the antenna to align with the satellite’s azimuth.
( 2 ) Elevation angle : Adjust the vertical angle so that the reflector “raises up” and is aligned with the satellite altitude.
( 3 ) Polarization angle : Rotate the LNB to match the polarization direction with the satellite signal.
5. Typical Application Scenarios of Receive Only Antennas :
Broadcast Signal Receiving Station : Provincial/municipal broadcast front-end and IPTV live streaming platform, stably receiving satellite relay signals to ensure that the general public at the grassroots level can watch clear and stable TV programs. It is the core hardware for the construction of grassroots broadcast signal transmission networks.
Meteorology and Remote Sensing : Receives meteorological satellite cloud images and marine remote sensing data for disaster prevention and mitigation, environmental monitoring, etc. The data is accurate and uninterrupted , and early warning information for natural disasters such as rainstorms, typhoons, and cold waves is issued in advance, providing accurate and reliable data support for disaster prevention and mitigation work and protecting the lives and property of the people.
Dedicated network for remote areas : In mining areas, oil fields, islands, and border outposts where there is no terrestrial network, broadband communication, video conferencing, and data transmission can be provided . Independent satellite dedicated communication networks can be built to enable video calls for field workers, real-time transmission of production data, and remote monitoring of equipment, solving the problem of communication blockage in remote industrial areas.
Emergency Communication Backup : As the “last mile” communication guarantee when the ground network is paralyzed, the government, fire department, and power emergency center can quickly restore basic communication links in the region , ensure the smooth issuance of emergency command instructions, and build a communication bridge between the disaster relief site and the rear command center.
6. Performance Highlights of the ANTESKY Receive Only Antenna:
Excellent resistance to rain attenuation, ensuring stable operation even in severe weather .
The signal reception remains stable even in light rain and cloudy weather; and it can still reliably lock onto satellite signals even in extreme rainy weather such as heavy summer rains and continuous plum rains .
It adapts to weak signals and complex terrain, breaking through environmental reception limitations .
In valleys where mountains obstruct the view, high gain is used to compensate for signal transmission loss; in foggy and humid coastal areas, low-noise components enhance the ability to identify weak signals; and in densely populated urban areas with high-rise buildings, precise narrow beams avoid interference from building obstructions.
Long-term stability: uninterrupted throughout the year
The overall structural design is solid and stable, the splicing panel gaps are tight, it is waterproof, dustproof, and prevents mosquito intrusion . It is wind-resistant and anti-aging, the panel is not easily deformed, and the signal attenuation is minimal after long-term use, making it a reliable choice for unattended sites.
7. Summary
A Receive Only antenna is a low-cost, highly reliable satellite signal receiving solution. Its key features are precise alignment, polarization matching, and stable installation.
ANTESKY‘s Receive Only antenna boasts superior resistance to rain attenuation , adaptability to weak signals and complex terrain , and long-term stability . It will continue to dominate the engineering receiver market and safeguard the stable transmission of satellite signals for various industries.