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10PCS Cdsenet TX433-FPC-4516 433MHz FPC Internal Antenna 2.0dBi IoT Lightweight
10PCS Cdsenet TX433-FPC-4516 433MHz FPC Internal Antenna 2.0dBi IoT Lightweight
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SKU:10*TX433-FPC-4516
Product Overview
The TX433-FPC-4516 is a 433MHz FPC (Flexible Printed Circuit) internal antenna designed for space-constrained IoT wireless terminals. It delivers a measured peak gain of 2.0 dBi and a typical VSWR of 1.21 at 433MHz, covering the 423–443MHz sub-1GHz band. The compact 45 × 16mm form factor with a 120mm IPX-I feeder cable enables direct integration into LoRa, FSK, and OOK-based modules and devices. Updated March 2026.
Technical Specifications
| Parameter | Value |
|---|---|
| Frequency Range | 423 – 443 MHz (Center: 433 MHz) |
| Peak Gain | 2.0 dBi |
| VSWR | ≤ 1.5 (Typ. 1.21 @ 433 MHz) |
| Impedance | 50 Ω |
| Connector Type | IPX-I (IPEX Gen 1 / U.FL compatible) |
| Cable Length | 120 mm (1.13mm coaxial) |
| Antenna Dimensions | 45 × 16 mm |
| Radiator Material | FPC (Flexible Printed Circuit) |
| Max Input Power | 50 W |
| Operating Temperature | -40 °C to +85 °C |
| Compliance | RoHS |
| Last Updated | March 2026 |
Product Details
Flexible FPC Radiator — Compact 45 × 16mm Footprint
The precision-etched FPC substrate measures just 45 × 16mm, making it one of the smallest 433MHz internal antennas in its gain class. A 3M adhesive backing allows tool-free mounting on the inner wall of any non-metallic (ABS, PC, TPEE) enclosure. The flexible body withstands repeated bending without RF performance degradation, supporting high-volume automated assembly.
Gold-Plated IPX-I Connector with 120mm 1.13mm Coaxial Feeder
The gold-plated IPX-I (U.FL-compatible) connector ensures low-resistance mating with Ebyte E32, E22-400, and third-party 433MHz LoRa/FSK modules. The 120mm 1.13mm-diameter coaxial feeder minimizes insertion loss while providing sufficient routing flexibility inside compact enclosures. No soldering required — press-fit installation in under 10 seconds.
Professional Test Report
Measured with a vector network analyzer (Agilent E5071C equivalent): VSWR = 1.21 @ 433 MHz, confirming ≤1.5 across the full 423–443 MHz operating band. Return loss ≥ 18 dB at center frequency.
Ideal Applications
Industrial IoT & LoRa
Long-range data acquisition nodes, pipeline monitoring, and factory automation using 433MHz LoRa or FSK modules.
Smart Utilities & Metering
Wireless water, gas, and electricity meter reading systems requiring compact internal antennas with reliable sub-1GHz coverage.
Smart Home & Security
Wireless alarm panels, remote keyless entry, and 433MHz RF remote control receivers in residential and commercial installations.
Agricultural Sensors
Soil moisture, temperature, and environmental monitoring nodes deployed across wide field areas with LoRa long-range connectivity.
Resources
📄 Download Datasheet (PDF)Frequently Asked Questions
Q: Is the TX433-FPC-4516 compatible with LoRa modules such as Ebyte E32-433T20D?
A: Yes. The TX433-FPC-4516 uses a standard IPX-I (U.FL) connector and is electrically matched to 50Ω systems at 433MHz. It is directly compatible with Ebyte E32, E22-400, and any third-party LoRa, FSK, or OOK module with an IPX-I socket in the 423–443MHz band. Confirm your module's connector generation (Gen 1 / IPX-I) before ordering, as IPX-4 (MHF4) connectors are not interchangeable.
Q: Can this antenna be installed inside a metal enclosure?
A: No. Placing any FPC or PCB antenna inside a metallic housing causes severe signal attenuation and VSWR degradation due to RF shielding. The TX433-FPC-4516 must be mounted on the inner surface of a non-metallic (ABS, PC, or TPEE) enclosure. Maintain a minimum clearance of 5mm from any metal component to preserve the rated 2.0 dBi gain and ≤1.5 VSWR.
Q: Does antenna orientation affect communication range?
A: Yes. The TX433-FPC-4516 has a directional radiation pattern at 433MHz. Incorrect placement orientation can reduce effective range by 20–40% compared to optimal positioning. Refer to the radiation pattern diagram in the datasheet (PDF above) for recommended mounting orientation relative to the target communication direction.
Q: What is the operating temperature range and environmental durability?
A: The TX433-FPC-4516 is rated for -40°C to +85°C, suitable for industrial and outdoor deployment. The FPC substrate is RoHS-compliant and resistant to humidity under standard operating conditions. For harsh outdoor environments, ensure the host enclosure provides adequate IP-rated sealing; the antenna itself is not independently IP-rated.
Q: How do I mount the TX433-FPC-4516 inside my device?
A: Peel the 3M adhesive backing and press the FPC flat against the inner wall of a non-metallic enclosure. Route the 120mm coaxial feeder to your module's IPX-I socket and press-fit the connector until it clicks. Avoid bending the feeder cable at a radius under 5mm. No soldering is required. Installation takes under 10 seconds and is compatible with automated production line assembly.