An RHCP patch antenna is a microstrip ceramic patch designed to receive right-hand circularly polarized signals. For GPS, GLONASS, Galileo, BeiDou, RTK, tracking device, timing, and precision-positioning receivers, RHCP is the polarization requirement, while “patch” describes the physical antenna. This page explains the engineering behind RHCP selection — polarization, axial ratio, multipath rejection, and phase-center stability — and then lists the RHCP ceramic patch antennas we supply.
If you only need the GPS/GNSS product overview, see the GPS patch antenna page. If you are comparing handedness, read RHCP vs LHCP patch antenna. The sections below focus on the technical decisions that determine whether an RHCP patch actually performs in your device.
Why GNSS Receivers Need RHCP
GNSS satellites transmit right-hand circularly polarized signals. A matched RHCP receiving antenna captures that energy efficiently, while a linearly polarized or wrong-handed antenna loses a large part of the signal to polarization mismatch. Because GNSS signals are already weak at the receiver, that mismatch loss directly reduces position fix reliability, time-to-first-fix, and tracking in difficult conditions.
RHCP also helps reject multipath. When a GNSS signal reflects off a building, vehicle, or the ground, its handedness tends to reverse from RHCP toward LHCP. A well-designed RHCP patch antenna discriminates against those reversed reflections, so the receiver sees a cleaner direct signal. This is one reason patch polarization quality matters as much as raw gain.
RHCP Multipath Rejection
Multipath is one of the largest error sources in precision GNSS. RHCP rejection is helpful but not a complete cure: ground-plane size, antenna height, mounting position, radome material, and receiver processing all shape the final result. For RTK, surveying, and tracking device positioning, combine a good RHCP patch with deliberate placement and a stable mechanical design. The broader pattern and beamwidth trade-offs are covered in patch antenna radiation pattern.
Axial Ratio — The Spec That Defines RHCP Quality
Axial ratio describes how close an antenna is to ideal circular polarization. An ideal RHCP antenna has an axial ratio of 0 dB; higher values mean the polarization is becoming elliptical and the antenna behaves less like a clean RHCP receiver. A patch can show a low axial ratio at broadside (straight up) yet degrade quickly toward the horizon, which is exactly where low-elevation satellites and multipath live.
For precision systems, do not accept a single broadside number. Ask for axial ratio across the operating band and over the useful sky angles, because that curve — not peak gain — predicts real tracking quality.
Phase-Center Stability for Precision Positioning
The phase center is the electrical reference point where the antenna “measures” the signal. In RTK and surveying, position is computed to the centimeter or millimeter level, so any movement of the phase center with frequency or arrival angle (phase-center offset and variation) becomes a direct position error. For high-accuracy work, request phase-center data or guidance for the specific model rather than assuming all patches behave the same. Lower-accuracy trackers and telematics units are far less sensitive to this.
RHCP vs LHCP — Quick Guidance
| Use case | Polarization |
|---|---|
| GPS / GNSS reception (trackers, RTK, tracking device, timing, telematics) | RHCP — matches satellite transmission |
| Special RF links, reflection studies, or test setups that specify it | LHCP — only when the system documentation requires it |
How to Compare RHCP Patch Antennas
Specify the RHCP GNSS antenna around the full receive chain and the final device, not by one datasheet number. Many buyers describe this as a circular polarized patch requirement; for GPS/GNSS selection, confirm RHCP gain, axial ratio, ground plane, and active options before sampling.
| Selection point | What to confirm |
|---|---|
| Frequency bands | GPS L1 only, L1 + GLONASS, or multi-band L1/L2/L5 for high precision |
| RHCP gain pattern | Gain over useful sky angles, not only the peak broadside figure |
| Axial ratio | Value across band and elevation angles — the real measure of CP quality |
| Phase-center stability | Offset/variation data for RTK and surveying designs |
| Ground plane | Datasheet test fixture vs your actual PCB and enclosure |
| Active or passive | Passive patch when the receiver is close; active (LNA) when cable loss or distance demands it |
| Mechanical fit | Patch size, connector, cable, and mounting for the enclosure |
For a step-by-step walkthrough, see how to choose a patch antenna. Antenna size, dielectric, and ground-plane interactions are detailed in the patch antenna design guide.
Our RHCP Ceramic Patch Antenna Range
The models below are RHCP ceramic patch antennas for GPS/GNSS designs. Full mechanical drawings, gain, axial ratio, and datasheets are available on request — we list confirmed bands and form factor here and provide measured specifications per model.
| Model | GNSS bands | Polarization | Notes | Product |
|---|---|---|---|---|
| GL-DYS2501 | GPS L1 (1575.42 MHz) | RHCP | Compact ceramic patch for embedded receivers | View |
| GL-DYS2502 | GPS / GNSS L1 | RHCP | Larger ceramic patch for bigger ground planes | View |
| GL2504 | GPS L1 + GLONASS (1602 MHz) | RHCP | Dual-constellation; ≥2 dBi, VSWR < 2, 50 Ω | View |
| GLS2502XCT | GPS L1 + GLONASS | RHCP | Dual-constellation embedded patch | View |
| GLXCT2504 | GPS L1 | RHCP | Ceramic patch for compact GNSS receivers | View |
| GL-DYS25 | GPS L1 (1575 MHz) | RHCP | 25 mm-class ceramic patch | View |
| GL-DYS18N4 | GPS L1 + GLONASS (1602–1608 MHz) | RHCP | 18 mm-class; return loss ≥15 dB, VSWR ≤1.5 | View |
| GLS2503 | GPS L1 | RHCP | Ceramic patch for GNSS modules | View |
Need a finished active antenna with cable, connector, and housing instead of a bare patch element? Send the receiver, cable length, and mounting requirement and we will match the assembly. For custom programs and sampling, see patch antenna manufacturer.
Typical RHCP GNSS Applications
- RTK rovers and base stations for centimeter-level positioning
- Precision agriculture, surveying, and mapping equipment
- tracking device and asset tracker navigation and high-accuracy GNSS — see patch antenna for asset tracking devices
- Timing receivers for telecom and synchronization
- Asset trackers, telematics terminals, and embedded GNSS modules
FAQ
Why do GNSS antennas need to be RHCP?
GNSS satellites transmit right-hand circularly polarized signals. An RHCP receiving antenna matches that polarization, avoids mismatch loss, and helps reject reflected (multipath) signals whose handedness has reversed.
What is axial ratio and why does it matter?
Axial ratio measures how close the antenna is to perfect circular polarization. A lower value (closer to 0 dB) is better. It matters most for precision GNSS, and it should be evaluated across the band and across sky angles, not only at broadside.
RHCP or LHCP for GPS?
Use RHCP for standard GPS and GNSS reception. Choose LHCP only when your system, test, or reflection-path design specifically requires it. See RHCP vs LHCP patch antenna for the full comparison.
Does an RHCP patch antenna fix multipath?
It reduces some reflected components because reflections tend to flip handedness, but it is not a complete fix. Ground plane, mounting, environment, and receiver processing all still affect multipath performance.
Can one ceramic patch cover multiband (L1/L2/L5) RHCP?
Yes, but multiband RHCP requires a purpose-built patch structure and measured data for each band. Tell us the exact constellations and bands and we will confirm which models or custom designs fit.
Request RHCP Patch Selection Support
Send your target GNSS bands, accuracy requirement, PCB and ground-plane size, enclosure, and cable or connector needs. We will recommend an RHCP ceramic patch or active assembly and provide measured axial ratio, gain, and phase-center data for your design.
