Flexible Printed Circuit Antenna (FPC)

What is an FPC Antenna?

An FPC antenna, or Flexible Printed Circuit Antenna (FPC), uses flexible PI and PET films as its substrate and is fabricated by etching and printing to create antenna circuits. It features lightweight, thin, flexible, and bendable characteristics, allowing it to conform to curved surfaces. Its thickness ranges from 0.03 to 0.2 mm, and its weight is less than 1 gram. The antenna can transmit and receive wireless signals and is compatible with protocols including WiFi, Bluetooth, GPS, 4G/5G, GNSS, NB-IoT, and LoRa, covering the 2.4 GHz, 5 GHz, and 5.8 GHz frequency bands. Qianmu Communications is a professional FPC antenna manufacturer with years of deep industry experience. We are equipped with three microwave anechoic chambers and have more than ten dedicated R&D personnel, enabling us to provide one-stop services—from antenna solution design to mass production.

Key selling point

Ultra-thin and flexible, free in space.

Flexible Printed Circuit Antenna (FPC) has a thickness of only 0.03–0.2 mm and can be bent or folded arbitrarily.It can be bent 90° along the inner wall of the cavity inside the device, perfectly adapting to various complex structural designs.Whether the device casing is flat or curved, the FPC antenna can easily conform to its surface.

Multi-band wideband coverage

Supports multiple communication protocols including 4G/5G, full-band WiFi, Bluetooth, GPS/GNSS, LoRa, and NFC.A single-chip FPC antenna can cover frequency bands ranging from 700 MHz to 2700 MHz—or even wider.To meet the communication needs of multi-mode and multi-frequency devices.

Lightweight design

The FPC antenna weighs less than 1 gram.More than 50% lighter than traditional metal antennas.For weight-sensitive products such as wearable devices and drones, FPC antennas are the best choice..

Ready to use right out of the box, easy to assemble.

Features standard 3M 300LSE adhesive backing for quick peel-and-stick assembly in 2 minutes. Available with IPEX, U.FL, MHF4, and other connector options.

Important Notes for Antenna Installation

1. Keep Away from Metal Surfaces

Do not install the antenna directly on or close to metal surfaces, as this may affect impedance matching, change the radiation pattern, and reduce overall antenna efficiency.

2. Avoid Excessive Bending

Do not over-bend or fold the antenna during installation, as excessive deformation may damage the internal conductor and negatively affect RF performance.

3. Ensure Secure Installation

Fix the antenna firmly and evenly during installation to prevent deformation that could impact radiation performance and signal stability.

4. Maintain Sufficient Clearance Around the Antenna

Maintain at least 5 mm clearance above and on both sides of the antenna. Avoid placing metal components, high-speed signal traces, or large copper areas near the antenna to ensure optimal performance.

5. Handle with Care During Assembly

Although the antenna features a flexible structure, the FPC material has limited mechanical strength. Avoid excessive pulling, twisting, or impact during installation and assembly.

6. Store in a Dry Environment

Avoid storing the antenna in high-temperature or high-humidity environments. Keep the product dry to maintain stable electrical performance and long-term reliability.

Quality Control and Testing

Qianmu Communications applies strict quality management throughout the entire manufacturing process, covering raw material inspection, production monitoring, and finished product testing.

Incoming Material Inspection

All incoming materials, including FPC substrates, copper foils, adhesives, and connectors, undergo strict quality inspection to ensure reliability and consistency.

AOI Optical Inspection

Automated Optical Inspection (AOI) is used to verify antenna circuit routing accuracy, solder joint quality, and product appearance to prevent manufacturing defects.

RF Performance Testing

Key RF parameters, including voltage standing wave ratio (VSWR), gain, and radiation pattern, are tested in a professional darkroom environment to ensure antenna performance meets requirements.

Environmental Reliability Testing

The antennas undergo various reliability tests, including high and low temperature cycling tests, humidity tests, bending life tests, and other environmental evaluations.

Batch Consistency Management

Strict production control ensures consistent performance and stable quality across every product batch.

Professional Antenna Manufacturing Experience

For over two decades, Qianmu Communications has been dedicated to the terminal antenna industry, focusing on the R&D, production, and sales of wireless communication terminal antennas. Our products are widely used in mobile communication devices, including smartphones, tablets, mobile payment systems, drones, wireless charging devices, automobiles, base stations, and wearable devices.

How to Choose an FPC Antenna

1. Confirm the operating frequency

Identify the wireless technologies your device requires, such as 4G/LTE, 5G, Wi-Fi, Bluetooth, GNSS, LoRa, or NFC. Select an antenna that supports all required frequency bands.

2. Evaluate the available installation space

Measure the available space inside the device, including length, width, and installation position. Thanks to their flexible structure and customizable dimensions, FPC antennas are well suited for compact or irregularly shaped enclosures.

3. Verify the RF connector type

Check the RF connector used on the PCB, such as IPEX, U.FL, or MHF4. The antenna connector must match the module interface to ensure reliable RF performance.

4. Review key RF parameters

· Gain: Choose an appropriate gain based on the application and installation environment.

· VSWR: A value below 2.0 is generally recommended for good impedance matching.

· Efficiency: Higher efficiency helps improve transmission performance and receiver sensitivity.

· Impedance: The standard RF impedance is 50Ω and should match the RF module.

5. Consider customization options

If standard products do not meet your design requirements, choose an FPC antenna manufacturer that provides customization services, including antenna dimensions, cable length, connector type, and RF tuning.

6. Evaluate the supplier's capabilities

Select an FPC antenna supplier with an established quality management system, RF engineering expertise, and reliable manufacturing capabilities to ensure consistent product quality and long-term supply.

FAQ

Q1: How do you choose between an FPC antenna and a PCB antenna?

A: FPC flexible and bendable, ideal for fitting into curved, narrow spaces—preferred for lightweight, thin devices. PCB rigid, suitable only for flat surfaces; choose this option if your budget is limited and you have ample space available.

Q2: Which frequency bands does the FPC antenna support?

A: Qianmu Communication's FPC antennas cover frequencies from 13.56 MHz NFC to 6 GHz 5G, supporting wireless technologies including 4G/5G, Wi-Fi, Bluetooth, GNSS, LoRa, and ZigBee.

Q3： What is the operating temperature of the FPC antenna?

A: -45℃ to +85℃, meeting industrial usage standards.

Q4: What are the differences among IPEX, U.FL, and MHF4 connectors?

A: All are miniature RF connectors, with dimensions U.FL > MHF4. The MHF4 is even smaller and is commonly used in 5G applications; simply select the connector based on your motherboard's interface specifications.

Q5: Does it support small-batch customization?

A: We offer support and can handle the entire order process—from scheme design and prototyping to small- and large-scale production.