Product Overview
Ebyte FPC & PCB built-in antennas are compact, high-performance internal antennas designed for space-constrained IoT devices. Available in single-band (433 / 868 / 915 MHz) and dual-band (2.4 / 5.8 GHz) variants, all models feature a UFL (U.FL / IPEX Gen-1) connector and are optimized for stable signal in enclosed enclosures.
| Attribute | Details |
|---|---|
| Brand | Ebyte (Chengdu Ebyte Electronic Technology Co., Ltd.) |
| Antenna Types | FPC (Flexible Printed Circuit) & PCB (Rigid Printed Circuit) |
| Frequency Bands | 433 MHz / 470 MHz / 868 MHz / 915 MHz / 2.4 GHz / 5.8 GHz |
| Connector | UFL / U.FL / IPEX Gen-1 (1.13mm cable or direct SMD) |
| Mounting | 3M self-adhesive backing (FPC) / SMD solder pad (PCB) |
| Operating Temp | -40℃ to +85℃ (industrial grade) |
| RoHS | Compliant |
| MOQ | 1 piece (sample available) |
Model Selection Guide
All 12 variants are in stock. Select by frequency band, form factor (FPC/PCB), and physical dimensions.
| SKU / Model | Type | Frequency | Size (mm) | Gain (dBi) | VSWR | Price |
|---|---|---|---|---|---|---|
| TX2400-PCB-4808 | PCB | 2.4 GHz | 48 × 8 | 2.0 | ≤2.0 | $0.32 |
| TXWF-PCB-4814 | PCB | 2.4 / 5.8 GHz (dual) | 48 × 14 | 2.0 / 3.0 | ≤2.0 | $0.47 |
| TXGB-PCB-3709 | PCB | 2.4 GHz (BLE/Zigbee) | 37 × 9 | 2.0 | ≤2.0 | $0.50 |
| TX4G-FPC-4707 | FPC | 700–2700 MHz (4G/LTE) | 47 × 7 | 2.0 | ≤3.0 | $0.23 |
| TX915-FPC-3009 | FPC | 868 / 915 MHz | 30 × 9 | 1.5 | ≤2.0 | $0.38 |
| TX470-FPC-5514 | FPC | 470 MHz | 55 × 14 | 1.5 | ≤2.0 | $0.31 |
| TX433-FPC-4810 | FPC | 433 MHz | 48 × 10 | 1.5 | ≤2.0 | $0.43 |
| TX433-FPC-2818 | FPC | 433 MHz | 28 × 18 | 1.2 | ≤2.5 | $0.31 |
| TX2400-FPC-4405 | FPC | 2.4 GHz | 44 × 5 | 2.0 | ≤2.0 | $0.31 |
| TX2400-FPC-1908 | FPC | 2.4 GHz | 19 × 8 | 1.5 | ≤2.5 | $0.26 |
| TX915-PCB-9514 | PCB | 868 / 915 MHz | 95 × 14 | 2.5 | ≤1.8 | $0.51 |
| TX915-PCB-7505 | PCB | 868 / 915 MHz | 75 × 5 | 2.0 | ≤2.0 | $0.49 |
Technical Specifications
| Parameter | FPC Series | PCB Series |
|---|---|---|
| Impedance | 50 Ω | 50 Ω |
| Polarization | Linear | Linear |
| Peak Gain | 1.2–2.0 dBi | 2.0–2.5 dBi (PCB has higher gain) |
| VSWR | ≤2.5 (typ. ≤2.0) | ≤2.0 (typ. ≤1.8) |
| Return Loss | ≤-10 dB | ≤-10 dB |
| Bandwidth | Narrowband (±10 MHz) | Narrowband (±15 MHz) |
| Connector | UFL / IPEX Gen-1 | UFL / IPEX Gen-1 |
| Cable | 1.13mm coax, 100mm (customizable) | Direct SMD or 1.13mm coax |
| Substrate | Flexible PI (Polyimide) | FR4 / Rogers (rigid) |
| Mounting | 3M adhesive backing | SMD solder / adhesive |
| Operating Temp | -40℃ to +85℃ | -40℃ to +85℃ |
| Storage Temp | -55℃ to +125℃ | -55℃ to +125℃ |
| Compliance | RoHS | RoHS |
Product Details
① Precision 50Ω Impedance Matching
Each antenna is tuned to 50Ω nominal impedance with VSWR ≤2.0 across the rated band. The UFL connector ensures repeatable, low-loss mating with standard IoT modules (Ebyte E22, E220, E32, E104, ESP32, nRF52840, etc.). Return loss ≤-10 dB guarantees minimal reflected power.
② FPC Flexible Design — Fits Any Enclosure
FPC antennas use a Polyimide (PI) substrate that bends and conforms to curved surfaces inside device housings. The 3M self-adhesive backing allows tool-free installation. Ideal for wearables, compact trackers, and sealed enclosures where rigid PCB antennas cannot fit.
③ PCB Rigid Antenna — Higher Gain, Better Repeatability
PCB antennas on FR4 substrate deliver 2.0–2.5 dBi gain with tighter manufacturing tolerances. Suitable for fixed installations such as gateways, routers, and industrial panels. The TX915-PCB-9514 (95×14mm) achieves 2.5 dBi at 868/915 MHz — the highest gain in this lineup.
④ Stable Signal in Metal-Adjacent Environments
Ebyte's internal antennas are characterized with a 10mm clearance from ground plane. Installation guidelines recommend keeping the antenna element ≥5mm from metal surfaces and ≥10mm from battery cells to maintain rated VSWR. The simulation-validated radiation pattern ensures omnidirectional coverage in the horizontal plane.
Installation Guidelines
| Rule | Requirement | Reason |
|---|---|---|
| Ground plane clearance | ≥5 mm from PCB ground | Prevents detuning of resonant frequency |
| Metal enclosure clearance | ≥10 mm from metal walls | Avoids VSWR degradation >3.0 |
| Battery clearance | ≥10 mm from Li-ion cells | Reduces interference and heating risk |
| Cable routing | Avoid sharp bends <5mm radius | Prevents impedance discontinuity in 1.13mm coax |
| UFL mating force | Press straight down, do not twist | Connector rated for 30 mating cycles |
| Adhesive surface | Clean, dry, flat surface | 3M adhesive requires ≥24h cure for full bond strength |
Ideal Applications
| Application | Recommended Model | Frequency |
|---|---|---|
| LoRa sensor nodes (EU868) | TX915-FPC-3009 / TX915-PCB-7505 | 868 MHz |
| LoRa sensor nodes (US915) | TX915-FPC-3009 / TX915-PCB-9514 | 915 MHz |
| Sub-GHz remote control / telemetry | TX433-FPC-4810 / TX433-FPC-2818 | 433 MHz |
| CN470 LoRaWAN / FSK devices | TX470-FPC-5514 | 470 MHz |
| WiFi / BLE / Zigbee devices | TX2400-PCB-4808 / TXGB-PCB-3709 | 2.4 GHz |
| Dual-band WiFi routers / gateways | TXWF-PCB-4814 | 2.4 + 5.8 GHz |
| 4G LTE / NB-IoT trackers | TX4G-FPC-4707 | 700–2700 MHz |
| Smart metering (water/gas/electricity) | TX915-PCB-9514 / TX433-FPC-4810 | 433 / 915 MHz |
| Smart agriculture sensors | TX915-FPC-3009 | 868 / 915 MHz |
| Asset tracking / logistics | TX4G-FPC-4707 / TX915-FPC-3009 | Multi-band |
Compatible Ebyte Wireless Modules
These antennas are plug-and-play compatible with all Ebyte modules featuring a UFL/IPEX antenna port:
| Module Series | Technology | Frequency | Recommended Antenna |
|---|---|---|---|
| E22-900T22S / E22-400T22S | LoRa (SX1262) | 868/915 / 433 MHz | TX915-PCB-9514 / TX433-FPC-4810 |
| E220-900T22S / E220-400T22S | LoRa (LLCC68) | 868/915 / 433 MHz | TX915-FPC-3009 / TX433-FPC-2818 |
| E32-433T20S / E32-915T20S | LoRa (SX1276) | 433 / 915 MHz | TX433-FPC-4810 / TX915-FPC-3009 |
| E104-BT5040U | BLE 5.0 (nRF52840) | 2.4 GHz | TX2400-FPC-4405 / TXGB-PCB-3709 |
| E103-W01 (ESP32) | WiFi + BLE | 2.4 GHz | TX2400-PCB-4808 / TXWF-PCB-4814 |
| E840-DTU (4G LTE) | 4G / LTE Cat-1 | 700–2700 MHz | TX4G-FPC-4707 |
Frequently Asked Questions
Q: What is the difference between FPC and PCB antennas?
A: FPC (Flexible Printed Circuit) antennas use a bendable Polyimide substrate with 3M adhesive backing — ideal for curved surfaces and compact enclosures. PCB (Rigid Printed Circuit) antennas use FR4 substrate and offer slightly higher gain (up to 2.5 dBi) with better manufacturing repeatability. Choose FPC for flexibility; choose PCB for maximum gain.
Q: Are these antennas compatible with LoRaWAN gateways and TTN/Helium?
A: Yes. The 868 MHz and 915 MHz antennas (TX915-FPC-3009, TX915-PCB-9514, TX915-PCB-7505) are fully compatible with LoRaWAN end-nodes operating on EU868 and US915 plans, including TTN, Helium, AWS IoT Core for LoRaWAN, and Ebyte's E106 gateway series.
Q: What connector type do these antennas use?
A: All models use a UFL connector (also called U.FL or IPEX Generation 1). This is the industry-standard micro RF connector used on most compact IoT modules. The mating connector on your module must also be UFL/IPEX Gen-1.
Q: Can I use a 915 MHz antenna for 868 MHz (EU) applications?
A: Yes. The TX915-FPC-3009 and TX915-PCB series are tuned to cover both 868 MHz (EU868) and 915 MHz (US915) within their bandwidth. VSWR remains ≤2.0 across 860–930 MHz, making them dual-region compatible.
Q: How do I install the FPC antenna inside a metal enclosure?
A: Mount the FPC antenna on a non-metallic surface (plastic lid or inner wall) with ≥10mm clearance from any metal. Clean the surface with isopropyl alcohol before applying the 3M adhesive. Route the UFL cable with a bend radius ≥5mm. Avoid placing the antenna directly on or behind a metal battery.
Q: What is the minimum order quantity (MOQ)?
A: MOQ is 1 piece for sampling. Bulk pricing is available for orders of 100+ pieces. Contact us via the store chat or email for volume quotes and custom cable length options.
Q: Do you offer custom antenna sizes or frequencies?
A: Yes. Ebyte's antenna engineering team supports custom FPC/PCB antenna design for frequencies from 315 MHz to 6 GHz, custom cable lengths (50–300mm), and custom connector types (SMA, MMCX, MHF4). Lead time is typically 3–4 weeks for custom samples.
Q: What is the TX4G-FPC-4707 frequency range exactly?
A: The TX4G-FPC-4707 covers 700–2700 MHz, making it suitable for 4G LTE (B1/B3/B7/B8/B20/B28), NB-IoT, Cat-M1, 3G WCDMA, and 2G GSM bands. It is not optimized for 5G NR Sub-6GHz above 3.5 GHz.
Packaging & Shipping
| Item | Details |
|---|---|
| Unit weight | ~10 g (antenna + cable + connector) |
| Packaging | Anti-static bag, individually packed |
| Shipping from | Chengdu, China (CN) |
| Lead time | In-stock: ships within 1–3 business days |
| Customs HS Code | 8517.70 (parts of communication apparatus) |
