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Truck Antenna

SIRIUS / XM Antenna Installation - Pickup Truck

Choosing an RFID Reader Antenna?

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If you are thinking about installing an RFID system, the choices may seem daunting. There are many factors to consider such as Setting, Coverage Range, and Potential Interference. RFID applications can be as diverse as environmentally sensitive products for Cold Chain Management to large-volume active tracking products for Homeland/Port Security to impact-resistant products for Distribution & Warehousing settings with heavy equipment and obstructed range.

Because Mobile Mark's expertise lies in the area of RF communications and antennas, this paper will address the antenna requirements for effective RFID systems. A well designed RFID antenna will provide optimal coverage, quicker registration of the RFID tag and greater hit-rates for tag reading. The right antenna will save the RFID users time and money by providing more reliable and more accurate reporting.

Frequency: RFID manufacturers in the US design systems to operate on a variety of frequencies depending on the application and the location. Current RFID systems include: HF at 13 kHz, UHF (or UltraHighFID) at 915 MHz (or 868 MHz in Europe) and RTLS (Real Time Location Systems) at 2.4 GHz. HF applications have been around longer and include applications such as the tagging and tracking of library books. Most UHF applications are newer than HF applications, so there are more unanswered questions as we move through the learning curve. For the sake of focus, this paper will cover RFID Reader Antennas for UHF frequencies.

 

Orientation of the tags: Polarization is important for optimal signal transfer. Site antennas that communicate with each other are installed so that they have the same polarization, for example both would be vertically aligned or horizontally aligned. Because it is difficult to know that orientation of the small RFID tags placed on many items, RFID manufacturers in the US use Reader Antennas that are typically configured to be circularly polarized. The radiation pattern makes it possible to get reliable read capture rates when tags are coming from all directions. Circularly polarized reader antennas provide higher read probability for those important high traffic settings.

Polarization direction: RFID reader antennas are typically designed to be circularly polarized in a particular direction. In the US, the standard configuration is right-hand circularly polarized and in Europe it is left-hand circularly polarized. The RFID manufacturers in the US will generally mark the spec sheets with RHCP or LHCP. Check with your RFID Manufacturer to confirm which is being used on your system.

 

Gain: Antennas for the RFID Readers are used to direct and shape the RFID signal from the Reader. The antennas are available in different gains, which allow the network installer to optimize the coverage area. Higher gain antennas throw the signal further but with a narrower beam; lower gain antennas will provide a rounder coverage area. Outdoor installations, such as in a car lot, may require a higher gain

Antenna but close-in applications, such as tracking items on a conveyer belt, will call for a lower gain antenna. Selecting the right level of gain for the application is important; for example, an RFID reader installed to read packages coming in one dock door should not be reading tags on packages coming in through a neighboring dock door. RFID manufacturers in the US will often certify a variety of antennas for their Readers.

 

Impact on RF performance: RF signals do not penetrate metal and will be deflected when they hit metal. At a minimum, RFID manufacturers in the US will tell you that item level Tags need to be placed on items in such a way that they are not shielded by metal. Other materials, such as water, can also pose an RF problem; it is difficult to read an RFID tag through liquid.

 

Impact on durability of antenna: Networks that are set up outdoors will need to be designed to handle a range of weather conditions. This may include large swings in temperature, or resisting moisture damage. Most RFID manufacturers in the US will provide detailed installation instructions with pointers such as "don't cover drain holes". These are important guideline; understanding how the antenna should be installed will go a long way towards eliminating problems down the road.

 

Unusual settings: Every installation is unique but some settings pose more challenges than others. The Fork Lift setting, for example, provides ample challenges for antenna design; the all-metal construction blocks efficient signal transfer while not providing enough backing for a solid ground plane. Look for an antenna design with sufficient shielding and with mounting solution that allows the antenna to be mounted to the load back rest of a forklift truck for palletized scanning.

 

Another challenging setting involves tracking items that are removed from and replaced in fixed locations such as a retail display or production conveyor belt. A Near Field Loop Antenna offers maximum power density in close proximity to the antenna. The read range for this style antenna is tag dependent but is typically up to 3 feet. The high forward directivity of the Near Field Loop Antenna combined with extreme isolation adjacent to the antenna results in fewer instances of misread tags.

 

Sensor: Some RFID readers have an antenna present sensing circuit, detecting a 10K ohm resistance. Some RFID Antenna manufacturers offer this as a standard feature on all of their RFID Reader Antennas.

 

Connections: It is important to know which connector is used as the RFID reader termination. Check with the RFID manufacturer in the US to see which connector is built into the RFID reader. The connector on the Reader Antenna will need to mate with that connector. Some RFID Antenna manufacturers will build the mating connector directly onto the antenna; others will put the connector onto a cable pigtail exiting from the RFID Reader.

 

Useful accessories: Jumper cable assemblies can be provided by many RFID manufacturers in the US or by many antenna manufacturers. Jumper cables allow for antenna to be positioned further from the RFID reader which increases the variety of installations possible.

 

 

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Mobile Mark antennas are used by RFID manufacturers in the US and Europe. Complete information on the variety of RFID Antennas can be found on the Mobile Mark website.

 

About the Author

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designs and manufactures site, mobile and device antenna for 600 MHz – 9 GHz. Applications include GPS Tracking & Fleet Management, Cellular GSM/CDMA, LTE, WiMAX, WiFi, RFID, Public Safety, Military and Machine-to-Machine (M2M). Engineering and custom design services available. Mobile Mark's global headquarters, which include research facilities and manufacturing plant, are located near Chicago, IL. An additional manufacturing and sales facility is located near Birmingham, UK.

 

Contact:

 

Eleanor Sylvan, VP Marketing

Mobile Mark, Inc.

Tel: 847-671-6690

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