The BBT-09YI14D18 from BBT ANTENNAS is a 900MHz dual-polarized Yagi antenna covering 902-928MHz, with 14dBi gain, ±45° slant polarization, a 42°/38° beam, two RP-SMA male connectors, one per polarization, and a length of 1000mm. One antenna feeds both chains of a 2x2 MIMO radio for wireless broadband CPE, point-to-point and SCADA links, or both ports of an RFID reader.
BBT-09YI14D18 Parameters
| Electrical | |
| Model Number | BBT-09YI14D18 |
| Frequency Range | 902-928MHz |
| Polarization Type | ±45° |
| Gain | 14dBi |
| 3dB Beam-Width. H-Plan | 42° |
| 3dB Beam-Width. E-Plan | 38° |
| VSWR | ≤1.5 |
| Front to Back Ratio(dB) | ≥17dB |
| Input Impedance | 50Ω |
| Max Input Power. | 50W |
| Lightning Protection | DC Grounded |
| Mechanical | |
| Connector Type | RP-SMA /M |
| Dimensions H*W*D (mm) | 1000*130*130（mm） |
| Radome Material | Aluminum |
| Radome color | Black |
| Operating Temperature Range | -40ºC/+60ºC |
| Support Pole Diameter | φ30-φ60(mm) |
| Rated Wind Velocity | 60m/s |
The BBT-09YI14D18 datasheet (PDF) shows the VSWR curve and radiation patterns behind these figures.
What ±45° Dual Polarization and 14dBi Gain Do for Your 900MHz Link
Some buyers know this design as a cross-polarized or dual-pol Yagi. It delivers high gain and good performance on both polarizations. Here is what the key figures mean in the field:
- ±45° dual polarization: the X-shaped elements carry two orthogonal polarizations, +45° and -45°, so the antenna works like two Yagis on one boom. Connected to the two ports, a 2x2 MIMO radio can run two data streams, or use diversity reception to ride out fading. One antenna replaces the old horizontal-plus-vertical pair of single-polarized Yagis, so the mast needs one bracket instead of two.
- 14dBi gain with a 42° H-plane and 38° E-plane beam: much more gain toward the far end than an omni antenna offers, with a beam wide enough to aim quickly.
- Front-to-back ratio ≥17dB: signals arriving from the rear are suppressed, cutting interference from other 900MHz transmitters behind the mast.
- VSWR ≤1.5 and 50Ω impedance: a close match to standard 50Ω radios and coaxial cable, so almost all transmit power is radiated instead of reflected back to the radio.
- Two RP-SMA male connectors, one per polarization: they plug straight into radios with RP-SMA female ports. Equipment with N-type ports connects through one adapter cable per connector.
- 50W max input power and DC grounded lightning protection: ample headroom for 900MHz radios and RFID readers, with a direct path to earth for static and surge energy.
- 1000mm length and 130×130mm cross-section: the antenna fits φ30-60mm support poles and is rated for a wind velocity of 60m/s.
Which Projects Use a 900MHz Dual-Polarized Yagi Antenna?
We designed the BBT-09YI14D18 for 902-928MHz wireless communication systems and RFID systems. As a 2x2 MIMO Yagi antenna, it fits three kinds of projects best.
900MHz 2x2 MIMO broadband for CPE and point-to-point links
Wireless ISPs use the 915MHz band to reach rural and wooded areas, because 900MHz signals get through trees where 2.4GHz and 5GHz links struggle. As the CPE antenna, or at both ends of a point-to-point hop, this dual-pol Yagi gives a 2x2 radio two independent paths, so both chains stay connected even when foliage blocks the line of sight. At the tower, pair it with a ±45° MIMO sector antenna, which BBT builds in 880-960MHz and 806-960MHz versions. Our guide to choosing a dual-polarized antenna for 5G, DAS and WISP projects compares other designs.
Industrial telemetry, SCADA and private networks
When a 900MHz telemetry radio or private-network gateway has two antenna ports, one dual-polarized Yagi gives it polarization diversity and fewer dropouts from multipath fading around tanks, pipe racks and buildings. Our guide to point-to-point directional transmission covers link planning between master and remote stations.
RFID reading with polarization diversity
Connect the two ports to two antenna ports on a UHF RFID reader. The reader switches between +45° and -45°, so it reads tags across a wider range of orientations than a single linear antenna. Where tags arrive at fully random angles, a circularly polarized panel such as RFID Antenna 2779 is the better fit.
Dual-Polarized or Single-Polarized: Choosing a BBT 900MHz Yagi
Compare the four BBT 900MHz Yagis below, or browse the full Yagi 698-4200MHz range. Of the four, the BBT-09YI14D18 is the only dual-polarized model, and the other three are vertically polarized with a single connector.
| Model | Frequency | Gain | Polarization | Beamwidth H / E | Front-to-Back | Max Power | Connector | Length |
|---|---|---|---|---|---|---|---|---|
| BBT-09YI14D18This antenna | 902-928MHz | 14dBi | ±45° dual | 42° / 38° | ≥17dB | 50W | Two RP-SMA male, one per polarization | 1000mm |
| BBT-09YI12V09 | 902-928MHz | 12dBi | Vertical | 42° / 38° | ≥17dB | 50W | N-type female | 865mm |
| BBT-09YI17V17 | 902-928MHz | 17dBi | Vertical | 25° / 25° | ≥20dB | 100W | RP-SMA male | 1809mm |
| BBT-0809YI13V09 | 806-960MHz | 13dBi | Vertical | 35° / 25° | ≥20dB | 50W | N-type female | 1220mm |
Values are taken from the parameter table on each model's product page.
- Radio with two antenna ports (2x2 MIMO or diversity): choose this dual-polarized BBT-09YI14D18.
- Single-port equipment: choose the 12dBi BBT-09YI12V09 for short- to medium-range links that are easy to aim, or the 17dBi BBT-09YI17V17 for the longest single hop.
- Extra coverage of 868MHz or the 850/900MHz cellular bands: choose the 806-960MHz BBT-0809YI13V09.
Our engineers will price the BBT-09YI14D18 for your 900MHz MIMO project and reply as soon as possible.
Get a Dual-Pol Yagi QuoteInstalling and Wiring a Dual-Polarized Yagi
Thick, firm material in a simple structure keeps the BBT-09YI14D18 convenient to install and use. Wiring two polarizations adds a few steps to normal Yagi practice:
- Match both ends: use a dual-polarized antenna at each end and mount both with the X-shaped elements in the same orientation, so every element has a parallel partner at the far end. Wire the radios so Chain 0 sits on the same polarization at both ends, and Chain 1 on the other.
- Align by RSSI: aim at the far end, then fine-tune while watching the signal strength (RSSI) of each chain. Close readings on the two chains show that the aim and the wiring are correct.
- Feeders: keep the two feeder runs equal in length and as short as possible, use low-loss coaxial cable and weatherproof both RP-SMA connections.
- Mounting: clamp the antenna to a φ30-60mm support pole. At 1000mm long, it is rated for a wind velocity of 60m/s.
- Materials and climate: the aluminum structure has a black anti-oxidation coating for a long service life outdoors, and the antenna operates from -40°C to +60°C.
- Grounding: the antenna is DC grounded for lightning protection. Bond the pole and both feeders to earth as standard site practice requires.
How BBT ANTENNAS Builds and Tests This Antenna
BBT ANTENNAS has designed and built antennas since 1991. More than 200 staff, including RF, microwave, simulation and structural engineers, work across R&D and production in a 30,000 m² workshop that has been in use since 2021. We hold ISO 9001:2015 and ISO 14001:2015 certification.
Production passes four QC stages: raw material, in-process, final and pre-shipment inspection. For an outdoor dual-pol Yagi, two checks matter most. Salt-spray chambers test how well the aluminum and its coating resist corrosion, and network analyzers verify VSWR.
We also offer OEM/ODM, with frequency band, connector type and feeder length discussed for each project. Our custom antenna manufacturing page explains how it works.
Take a look inside BBT ANTENNAS and our factory in this company video:
900MHz Dual-Polarized Yagi Antenna FAQ
Where is the BBT-09YI14D18 900MHz dual-polarized Yagi antenna used?
It serves 902-928MHz wireless communication and RFID systems in which the radio or reader has two antenna ports. Typical projects are 2x2 MIMO broadband CPE and point-to-point links in rural or wooded areas, SCADA and telemetry links, private 900MHz networks and UHF RFID reading with polarization diversity.
Can I connect this antenna to a 2x2 MIMO radio, and how do I wire the two ports?
Yes. The antenna has two RP-SMA male connectors, one per polarization, and each radio chain connects to one of them. Use a dual-polarized antenna at the far end too, mount both with the X-shaped elements in the same orientation, and wire both radios so each chain uses the same polarization at both ends.
What is the difference between ±45° and horizontal/vertical (H/V) dual polarization?
Both schemes use two orthogonal polarizations, and both work for 2x2 MIMO, as long as the far end uses the same scheme. Each ±45° slant polarization picks up horizontal and vertical signal components equally, so signal levels on the two chains stay more evenly balanced. Our 470-698MHz dual-polarized Yagi for TV white space uses H/V polarization instead.
Should I choose a dual-polarized 14dBi Yagi or a single-polarized 12dBi or 17dBi model?
Start with the radio. If it has two antenna ports for 2x2 MIMO or diversity, choose this dual-polarized 14dBi model. For single-port equipment, the 12dBi BBT-09YI12V09 (865mm, 42°/38° beam) handles short- to medium-range links and is easy to aim, and the 17dBi BBT-09YI17V17 (1809mm, 25° beam) covers the longest single hop.
How do I connect the RP-SMA male connectors to N-type equipment or a long feeder?
Fit each antenna port with an adapter cable that has an RP-SMA female connector at one end and an N-type connector at the other. The N-type end then mates with the radio or with a longer run of low-loss feeder. Keep every cable run as short as the site allows, because cable loss grows with length.
Can this dual-polarized Yagi be used for UHF RFID?
Yes. Its 902-928MHz range covers the North American UHF RFID band. Connect the two ports to two ports on the reader, and the reader switches between the polarizations, which makes reads more tolerant of tag orientation. When tags arrive at completely random angles, a circularly polarized panel antenna such as RFID Antenna 2779 handles them better.
Planning a 900MHz 2x2 MIMO link? Contact our team for a BBT-09YI14D18 quote, and we will reply as soon as possible.
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