Custom Stereo Foldable Headphone

Custom UHF . Antenna

A custom UHF RFID antenna can be tailored to specific requirements, such as size, shape, gain, and radiation pattern. This customization allows the antenna to be optimized for a particular application, environment, or mounting location.

Custom UHF RFID antennas can be designed using various materials, such as printed circuit boards (PCBs), flexible substrates, or specialized antenna materials. They can also be optimized for specific frequency bands, such as 865-868 MHz in Europe or 902-928 MHz in the United States.

Overall, a custom UHF RFID antenna offers flexibility in terms of design, performance, and integration, allowing for improved RFID system performance and adaptability to specific application requirements.

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Ultra-High Frequency (UHF) RFID systems typically operate in the frequency range of 860 MHz to 960 MHz. However, the exact frequency range can vary depending on the region due to regulatory requirements:

1. North America: 902-928 MHz

2. Europe: 865-868 MHz

3. India: 865-867 MHz

4. Southeast Asia: Varies by country, commonly 920-925 MHz or 866-869 MHz

These frequencies are chosen to balance the trade-offs between read range, data transfer rate, and regulatory constraints. UHF RFID systems are popular because they offer a good balance of range and speed, making them suitable for various applications such as inventory management, asset tracking, and supply chain logistics.

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UHF RFID Antenna Gain (Simplified)

1. What Is Antenna Gain?
Antenna gain measures how well an antenna focuses radio waves in a certain direction compared to an ideal antenna that radiates equally in all directions. It’s expressed in decibels (dBi).

2. Why It Matters in UHF RFID Systems

Read Range: Higher gain → longer read distance.
Direction: High-gain antennas focus signals, useful when you want a specific reading area.
Signal Strength: Stronger, more reliable tag detection.

3. Types of UHF RFID Antennas

Linear Polarized: For fixed tag orientations, gain ≈ 6–12 dBi.
Circular Polarized: For random tag orientations, gain ≈ 5–9 dBi.

4. Factors Affecting Gain

Design: Shape and size of antenna.
Frequency: Gain changes across frequency range.
Material: Construction materials impact efficiency.
Environment: Obstacles and reflections reduce effective gain.
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– Suitable for environments where tag orientation varies.

– Gain ranges from 5 dBi to 9 dBi.

Factors Affecting Antenna Gain

Design and Structure: The physical design, including size and shape, directly impacts the gain.

Frequency: Antennas are designed for specific frequency ranges, and their gain can vary across these frequencies.

Material: The materials used in the construction of the antenna affect its efficiency and gain.

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Environment: The presence of obstacles, interference, and reflections in the environment can affect the effective gain.

Regulations: Regulatory bodies (like FCC in the USA) impose limits on the maximum allowable gain and power output to avoid interference with other devices.

Conclusion

Antenna gain is a critical factor in the performance of UHF RFID systems. Selecting the appropriate antenna with the right gain for your specific application can significantly enhance the efficiency and reliability of the RFID system. Always consider the application’s requirements, environmental conditions, and regulatory constraints when choosing an RFID antenna.

UHF RFID Antenna .

UHF RFID antennas can have different polarization types, including linear polarization and circular polarization.

Linear polarization means that the electromagnetic waves radiated by the antenna are oriented in a specific direction. Linearly polarized antennas can have either vertical or horizontal polarization. Vertical polarization means that the electromagnetic waves are radiated in a vertical direction, while horizontal polarization means that the waves are radiated in a horizontal direction.

Circular polarization means that the electromagnetic waves radiated by the antenna rotate in a circular motion. Circularly polarized antennas can have either right-hand circular polarization (RHCP) or left-hand circular polarization (LHCP). RHCP means that the waves rotate in a clockwise direction when viewed from the front of the antenna, while LHCP means that the waves rotate in a counterclockwise direction.

The choice of antenna polarization in UHF RFID systems depends on the specific application requirements, tag orientation, and environmental conditions. Linear polarization can offer higher gain and longer read ranges when tag orientation is controlled, while circular polarization provides more flexibility and reliability in environments with varied tag orientations. Understanding these factors will help in designing an efficient and effective RFID system.

Table Of Contents For This Page

It is not easy to introduce all aspects of UHF RFID antenna, so we have prepared a lot of information on this page for you to delve into. To make sure you can find the information you want quickly, we have prepared this content directory that will jump to the corresponding location when you click on it.

Applications

Hot Products

Cost Analysis

Duration Estimation

Basic Knowledge

Common Pitfalls

Self-Nomination

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General Applications For UHF RFID Antennas

UHF (Ultra High Frequency) RFID (Radio Frequency Identification) antennas are devices used to transmit and receive radio signals in the UHF frequency range. These antennas are commonly used in various applications that require long-range identification and tracking of objects or people. Some general applications for UHF RFID antennas include inventory management, supply chain management, access control, asset tracking, logistics transportation and retail operations. UHF RFID antennas are designed to be highly efficient and provide reliable communication between RFID readers and tags, making them suitable for a wide range of industries and environments.

General Hot Selling UHF RFID Antennas

Simplified UHF RFID Antenna Selection Guide

Frequency Range:
Match the antenna to your region (e.g., 902–928 MHz for North America, 865–868 MHz for Europe).
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Polarization:
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Read Range:
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Connector Type:
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- Ceiling: Overhead zones
- Pole: Outdoor or wide coverage
- Embedded: Built into equipment
Environment:
Check IP rating (dust/waterproof) and operating temperature range.
Size/Form Factor:
Choose a size that fits your space—compact for tight areas, larger for stronger performance.

Selecting the correct UHF RFID antenna is crucial for system performance. Consider the following key parameters:

1. Frequency Range – Compatibility: Ensure the antenna supports the regional UHF RFID frequency range (e.g., 902-928 MHz for North America, 865-868 MHz for Europe).

2. Gain – Signal Strength: Measured in dBi, higher gain (e.g., 12 dBi) offers longer read range but narrower beamwidth. Lower gain (e.g., 9 dBi) provides wider coverage but shorter range.

3. Polarization – Orientation:

– Linear: Best for consistent tag orientation.

– Circular: Ideal for unpredictable tag orientations, ensuring reliable reads.

4. Axial Ratio – Polarization Quality: For circularly polarized antennas, a lower axial ratio (close to 1 dB) ensures better performance. Aim for 3 dB or lower.

5. Read Range – Distance: Choose an antenna that meets your required read range, influenced by power, gain, tag sensitivity, and environment.

6. Connector Type – Compatibility: Match the antenna connector type (e.g., SMA, TNC, N-Type) with your RFID reader’s connector, considering gender and polarity.

7. Mounting Type – Installation: Select based on your environment:

– Wall-Mounted: Fixed installations.

– Ceiling-Mounted: Overhead setups.

– Pole-Mounted: Outdoor/high-traffic areas.

– Embedded: Integrated into devices.

8. Environmental Considerations – Durability: Check the IP rating for dust/water resistance and ensure it operates within your temperature range.

9. Size and Form Factor – Space Constraints: Ensure the antenna fits within your installation area, choosing compact or larger antennas as needed.

Model: STQ9G4C

865/915MHz 4dBi Circular Quadrifilar Helix Antenna

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Model: STR9G11C-PRO

Model: STR8G11C-PRO

865/915MHz Narrow Beamwidth 11dBi Circular RFID Antenna

High gain, Narrow beamwidth
High performance, Optimized Patterns
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Optional Mounting: Vertical or Horizontal Mast Mount
Long-term durability and IP54 rating for outdoor applications

The new 11dBi circularly polarized antenna features a narrow 35-degree beamwidth, making it ideal for focused, high-precision applications across both FCC (902–928 MHz) and ETSI (865–868 MHz) frequency ranges. Its directional design is particularly suited for scenarios requiring targeted coverage, such as portal control, item-level tracking, selective zone monitoring, and high-density read environments. The antenna can be conveniently mounted on walls, ceilings, or poles, allowing for flexible installation in applications where precise read zones and minimal interference are critical.

Model: ST-E-DC-H4-01

Dimensions: 223x223x49.5mm

Die-casting Aluminum Enclosure For The Reader

Light weight, Compact design, Cost-effective solution
Excellent compatibility and integration with the antennas
Long salt spray duration for rigid environments
Custom Output Ports, ranging from 2 port to 8 ports
Optional surface finishes and colors: Powder Coat or Sandblasted

This enclosure is widely used in the field of RFID technology. Designed to provide a sturdy and reliable housing for RFID readers, it ensures optimal protection in various applications.

Additionally, the enclosure is lightweight with a sleek and compact design, making it easy to install and transport. It also offers excellent electromagnetic shielding properties, helping to protect the enclosed RFID readers from interference.

Overall, this die-cast aluminum enclosure provides a cost-effective solution for protecting and housing RFID readers, ensuring their optimal performance and longevity.

Model: ST-B-RF-01

Model: ST-B-RF-02

Universal Die-casting Aluminum Bracket For The Enclosure

Adjustable mounting angle
Long salt spray duration for rigid environments
Optional Mounting Type: Mast Mount or Wall Mount
Excellent compatibility and integration with the antennas
Optional surface finish and color: Paint or rock grinding (Natural)

The die-casting aluminum bracket is a versatile and durable mounting solution for RFID readers and antennas. It is specifically designed to provide a secure and stable platform for installing and positioning RFID readers in various outdoor environments.

One of the key features of the die-casting aluminum bracket is its robust construction. Made from high-quality aluminum alloy, it offers exceptional strength and durability, ensuring that the mounted RFID reader remains stable and secure even in harsh weather conditions.

The bracket is also designed for easy installation and adjustment. It comes with pre-drilled holes and mounting hardware, allowing for quick and hassle-free installation. Additionally, it offers multiple adjustment options, enabling users to easily change the angle and position of the RFID reader for optimal performance.

Overall, the die-casting aluminum bracket is a reliable and versatile solution for mounting RFID readers. Its durable construction, easy installation, and adjustable design make it a popular choice for various outdoor applications.

Estimated Cost Analysis For 915MHz 12dBi Linear UHF RFID Antenna

Please note that the final cost depends on your detailed requirements of UHF RFID antenna. Such as the frequency, gain, polarization, connector type, mounting options, plastic radome/array/backplate raw material, product finish, IP rating, and the distance of transportation. Take an example of booking a 40HQ (1600 PCS) of a 915MHz 12dBi linear RFID Antenna, based on EXW:

Antenna Radome 1600 PCS and $4.23 for each $10,000

UV-ABS, White, 450x450x40mm

$10,000

Antenna arrays 1600 Units and $6.35 for each $10,000

4 each linear element, one 860-960MHz antenna combiner and feeding network, with a N-female connector mounted on the backplate.

$10,000

Reflector/Backplate 1600 PCS and $9.58 for each $10,000

Size: 440x440mm, Material: 2.0mm 5052 aluminum alloy; Surface finish: White paint or wire brush

$10,000

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$10,000

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$1,000

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$4,300

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$4,300

Towing & customs clearance fee and US$915.00 for each bill

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$4,300

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$4,300

cURL Too many subrequests. & Duration Estimation

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Step 3: Prepare the material for the prototypes (5-7 days)

On average, it takes PCB suppliers 5-7 working days to prepare and manufacture the antenna array materials, such as FR4 or F4B. This time frame includes the shipping time as well.

Step 4: Prototype testing (1-2 days)

The antenna prototype is tested in an anechoic chamber to measure and analyze the electromagnetic radiation pattern. Engineer can accurately measure and analyze the antenna’s performance, identify any design flaws, and optimize the antenna’s radiation characteristics for specific applications.

Step 5: Shipping to the USA(4-5 days)

Normally, we will arrange the shipment by DHL since it’s the fastest channel for prorotypes. There is no big difference on the freight cost compared with FedEx/UPS.

We can also use a special channel if it’s not urgent and the packaging size is big. The import tariff and customs clearance can be included. This can save you a lot of money.

Step 6: Trial order without making any new tooling/mold (7-15 days)

Once the prototypes are received and tested in a real-world conditions and get approved. It’s suggested to place a small quantity trial order. This way, any potential problems or defects can be identified and resolved before moving forward with mass production.

Step 7: Mass production (15-30 days)

Once the trial order has been successfully completed without any issues, we can proceed with mass production of the new antenna product. What we need to do next is to reduce the cost without compromise on the product quality and performance. It’s included but not limited to optimizing the product performance & structure, improving production efficiency, and source new suppliers, etc.

Want to know how to compress lead-time of mass production?

Compressing lead times for mass production of UHF RFID antenna is crucial for businesses looking to meet customer demands and stay competitive in the market. By implementing strategies such as optimizing production processes, streamlining supply chain management, and utilizing advanced manufacturing technologies, companies can significantly reduce the time it takes to produce UHF RFID antennas and improve overall operational efficiency.

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Andrew Chen 5 März 2024

cURL Too many subrequests. Common Pitfalls When Purchasing from China

When purchasing UHF RFID antennas from China, there are several common pitfalls that buyers should be aware of. These pitfalls include poor quality control, misleading specifications, and lack of technical support, etc.

One of the main reasons these pitfalls occur is due to the large number of suppliers in China. With so many options available, it can be difficult to find a reliable and trustworthy supplier. Some suppliers may not have the necessary experience or expertise to produce high-quality antennas, leading to poor performance and durability issues. Many Chinese manufacturers prioritize quantity over quality, leading to a higher likelihood of receiving a defective or subpar product. This can result in antennas that do not perform as expected or have a short lifespan.

Quality issues
Communication barriers
Shipping and logistics
Limited warranty options
Lack of after-sales support
Limited customization options
Intellectual property concerns
Difficulty in finding reputable manufacturers

Misleading Specifications:
Some suppliers exaggerate antenna performance, and real tests may show lower results.

Limited Technical Support:
Many vendors offer little help with setup or troubleshooting, leaving buyers to solve problems themselves.

Communication Issues:
Language and cultural differences can cause misunderstandings and delays during purchase.

Another reason for these pitfalls is misleading specifications. Some Chinese manufacturers may exaggerate the performance capabilities of their antennas in order to attract buyers. However, when the antennas are tested in real-world conditions, they may not meet the stated specifications.

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cURL Too many subrequests. cURL Too many subrequests. About UHF RFID Antennas

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A UHF RFID antenna is a component of an RFID system that transmits and receives radio frequency signals to and from RFID tags within the UHF (Ultra High Frequency) range, typically between 300 MHz and 3 GHz.

2. What frequency range do UHF RFID antennas operate in?

UHF RFID antennas generally operate in the frequency range of 860 to 960 MHz, with regional variations such as 902-928 MHz in North America and 865-868 MHz in Europe.

3. What are the main types of UHF RFID antennas?

The main types of UHF RFID antennas include linear polarized antennas, circular polarized antennas, and near-field antennas.

4. What is the difference between linear and circular polarized antennas?

Linear polarized antennas emit waves in a single plane, making them suitable for environments where the tag orientation is predictable. Circular polarized antennas emit waves in a circular pattern, allowing them to read tags regardless of orientation.

5. What are near-field UHF RFID antennas used for?

Near-field UHF RFID antennas are used for reading tags at very close ranges, typically within a few centimeters, and are ideal for applications requiring high precision, such as item-level tagging.

6. How does the environment affect UHF RFID antenna performance?

Environmental factors such as metal surfaces, liquids, and interference from other electronic devices can affect the performance of UHF RFID antennas by reflecting or absorbing RF signals.

7. What is antenna gain, and why is it important?

Antenna gain measures how well an antenna converts input power into RF energy in a specific direction. Higher gain antennas can read tags at greater distances but may have a narrower beam width.

8. Can UHF RFID antennas be used outdoors?

Yes, but they must be designed to withstand environmental conditions such as rain, dust, and temperature variations. Outdoor antennas often have weatherproof enclosures.

9. What is the typical read range of a UHF RFID antenna?

The read range can vary widely depending on the antenna type, tag type, and environmental conditions, but typically ranges from a few centimeters to over 20 meters.

10. How do you choose the right UHF RFID antenna for an application?

Consider factors such as read range requirements, tag orientation, environmental conditions, and the specific application (e.g., asset tracking, inventory management).

11. Can multiple UHF RFID antennas be used simultaneously?

Yes, multiple antennas can be used to cover larger areas or to improve read accuracy and reliability. However, care must be taken to manage potential interference.

12. Can you provide enclosure options with the UHF RFID Antenna?

Yes, we can offer a suitable enclosure to fit your reader module. Besides, we can custom a enclosure if the current designs can't meet your demand.

13. How do you mount a UHF RFID antenna?

UHF RFID antennas can be mounted using brackets, stands, or enclosures, depending on the application. Proper alignment and positioning are crucial for optimal performance.

14. What is the impedance of a typical UHF RFID antenna?

The impedance of most UHF RFID antennas is 50 ohms, which matches the impedance of standard RFID readers and cables.

15. Can UHF RFID antennas be integrated into handheld devices?

Yes, there are compact UHF RFID antennas designed specifically for integration into handheld readers and mobile devices.

16. What is the impact of cable length on UHF RFID antenna performance?

Longer cables can introduce signal loss, reducing the effective read range and performance of the antenna. High-quality, low-loss cables are recommended for longer runs.

17. Are there any regulations governing the use of UHF RFID antennas?

Yes, UHF RFID antennas must comply with regional regulatory standards, such as FCC regulations in the United States and ETSI standards in Europe, which govern frequency usage and power output.

18. What is the typical power output of a UHF RFID antenna?

The power output is typically controlled by the RFID reader and can range from a few milliwatts to several watts, depending on the application and regulatory limits.

19. How do you test the performance of a UHF RFID antenna?

Performance can be tested using an RFID reader and software to measure read range, read accuracy, and signal strength. Field tests in the actual deployment environment are also important.

20. Can UHF RFID antennas be used for both reading and writing to tags?

Yes, UHF RFID antennas can both read data from and write data to RFID tags, allowing for versatile applications such as inventory updates and access control.

Available Model Options

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Model	Frequency (MHz)	Gain (dBi)	Polarization	VSWR	HW/VW (°)	Connector	Dimensions （mm）	Datasheet
cURL Too many subrequests.	856-858	4	cURL Too many subrequests.	≤1.3	110/110	cURL Too many subrequests.	cURL Too many subrequests.	Download
cURL Too many subrequests.	865-868	5.5	cURL Too many subrequests.	≤1.3	100/100	cURL Too many subrequests.	cURL Too many subrequests.	Download
cURL Too many subrequests.	865-868	8	cURL Too many subrequests.	≤1.3	70/70	cURL Too many subrequests.	cURL Too many subrequests.	Download
cURL Too many subrequests.	865-868	9	cURL Too many subrequests.	≤1.3	75/65	cURL Too many subrequests.	cURL Too many subrequests.	Download
cURL Too many subrequests.	865-868	8	cURL Too many subrequests.	≤1.3	70/70	cURL Too many subrequests.	cURL Too many subrequests.	Download
cURL Too many subrequests.	865-868	9	cURL Too many subrequests.	≤1.3	65/65	cURL Too many subrequests.	cURL Too many subrequests.	Download
cURL Too many subrequests.	865-868	11	cURL Too many subrequests.	≤1.3	72/35	cURL Too many subrequests.	cURL Too many subrequests.	Download
cURL Too many subrequests.	865-868	12	cURL Too many subrequests.	≤1.3	40/40	cURL Too many subrequests.	cURL Too many subrequests.	Download
cURL Too many subrequests.	865-868	12	cURL Too many subrequests.	≤1.3	40/40	cURL Too many subrequests.	cURL Too many subrequests.	Download
STQ9G4C	902-928	4	cURL Too many subrequests.	≤1.3	110/110	cURL Too many subrequests.	cURL Too many subrequests.	Download
STR9G5C	902-928	5.5	cURL Too many subrequests.	≤1.3	100/100	cURL Too many subrequests.	cURL Too many subrequests.	Download
STR9G8L	902-928	8	cURL Too many subrequests.	≤1.3	70/70	cURL Too many subrequests.	cURL Too many subrequests.	Download
STR9G9L-PRO	902-928	9	cURL Too many subrequests.	≤1.3	75/65	cURL Too many subrequests.	cURL Too many subrequests.	Download
STR9G8C	902-928	8	cURL Too many subrequests.	≤1.3	70/60	cURL Too many subrequests.	cURL Too many subrequests.	Download
STR9G9C-PRO	902-928	9	cURL Too many subrequests.	≤1.3	65/65	cURL Too many subrequests.	cURL Too many subrequests.	Download
STR9G11C-PRO	902-928	11	cURL Too many subrequests.	≤1.3	72/35	cURL Too many subrequests.	cURL Too many subrequests.	Download
STR9G12L	902-928	12	cURL Too many subrequests.	≤1.3	40/40	cURL Too many subrequests.	cURL Too many subrequests.	Download
STR9G12C	902-928	12	cURL Too many subrequests.	≤1.3	40/40	cURL Too many subrequests.	cURL Too many subrequests.	Download
STR9G15CC	902-928	15	cURL Too many subrequests.	≤1.5	71/22	SMA-female	1600x188x21	Download
STR89G9C	860-960	9	cURL Too many subrequests.	≤1.3	70/60	cURL Too many subrequests.	cURL Too many subrequests.	Download