Mount Antenna
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 NEW RUBBER ROOF MOUNT SWIVEL BASE UNIVERSAL CAR ANTENNA $8.45 Time Remaining: 29d 18h 52m Buy It Now for only: $8.45 |
 1X GPS Antenna FOR Garmin GA 29 GA 26 25BNC 010 00174 03 MAGNETIC ROOF MOUNT $8.80 Time Remaining: 8h 25m Buy It Now for only: $9.88 |
 TRAM 2315 XM SIRIUS Combo Truck RV Mirror Mount Antenna with Cable $30.98 Time Remaining: 29d 11h 35m Buy It Now for only: $30.98 |
 Garmin Magnetic Mount Antenna $24.60 Time Remaining: 28d 16h 13m Buy It Now for only: $24.60 |
 NEW Sirius XM Satellite Radio Magnetic Mount High Gain Universal Car Antenna $14.49 Time Remaining: 15h 25m Buy It Now for only: $14.49 |
 JEEP WRANGLER 1987 2011 Stereo Radio Top Side Rear Mount Spring Pivot ANTENNA $33.95 Time Remaining: 15h 40m Buy It Now for only: $33.95 |
 TRAM 2315 XM SIRIUS Combo Truck RV Mirror Mount Antenna with Cable $30.98 Time Remaining: 20d 23h 48m Buy It Now for only: $30.98 |
 MSTRSAT Universal XM Sirius Mirror Mount Truck Antenna $35.99 Time Remaining: 1d 17h 45m Buy It Now for only: $39.59 |
 NEW METRA 44 UA46 AMPLIFIED ROOF MOUNT AM FM ANTENNA $29.95 Time Remaining: 5d 17h Buy It Now for only: $29.95 |
 Cowl Pillar Side Top Rear Mount Stereo Radio ANTENNA Mast Cable and Two 2 Bases $27.95 Time Remaining: 3d 13h 32m Buy It Now for only: $27.95 |
 Wilson 1000 High Power Mag Mount CB Radio Antenna New $84.95 Time Remaining: 26d 12h 7m Buy It Now for only: $84.95 |
 Garmin Astro 220 Magnetic Mount Antenna 010 10931 00 $34.99 Time Remaining: 23d 11h 15m Buy It Now for only: $34.99 |
 TRAM 2315 XM SIRIUS Combo Truck RV Mirror Mount Antenna with Cable $30.98 Time Remaining: 25d 17h 54m Buy It Now for only: $30.98 |
 TRAM XM SATELLITE RADIO MIRROR MOUNT ANTENNA 2315 $29.98 Time Remaining: 24d 14h 37m Buy It Now for only: $29.98 |
 XM Satellite Radio Mirror Mount Antenna $15.00 Time Remaining: 1d 23h 16m |
 Metra 44 UA46 met 44ua46 Amplified Electronic Roof Mount Antenna $29.99 Time Remaining: 28d 10h 53m Buy It Now for only: $29.99 |
 Garmin Astro 220 Magnetic Mount Antenna 010 10931 00 for Astro 220 and 320 $34.50 Time Remaining: 18d 15h 43m Buy It Now for only: $34.50 |
 Fiat Punto Seicento Bravo Brava Doblo Ducato Front Roof Mounted Aerial Antenna $15.64 Time Remaining: 26d 9h 34m Buy It Now for only: $15.64 |
 New Car Auto TV Booster FM Radio Windshield Mount Digital DVB T Antenna Aerial $9.98 Time Remaining: 6d 19h 51m Buy It Now for only: $9.98 |
 Car Windshield Mount Electronic FM Radio TV Antenna New $6.99 Time Remaining: 24d 6h 10m Buy It Now for only: $6.99 |
 Ford FOCUS 17 BLACK Spiral Roof Mount Removable Screw On and Off ANTENNA MAST $15.95 Time Remaining: 3d 13h 11m Buy It Now for only: $15.95 |
 OLD Trimble GPS antenna with cable and mounting ring $7.50 (1 Bid) Time Remaining: 1d 13h 57m |
 Toyota TERCEL PREVIA am fm Car Stereo Radio Pillar Mount Retractable ANTENNA NEW $17.00 Time Remaining: 15h 40m Buy It Now for only: $17.00 |
 Car Hidden Internal Glass Screen Mount Amplifier Aerial Antenna $1.00 Time Remaining: 21h 19m Buy It Now for only: $1.00 |
 WINDSHIELD MOUNT AMPLIFIED ANTENNA CAR WINDOW PLUG $10.99 Time Remaining: 11d 10h 54m Buy It Now for only: $10.99 |
 Suzuki SAMURAI 1986 1995 CENTER PILLAR MOUNT am fm Stereo Radio ANTENNA NEW $18.00 Time Remaining: 3d 13h 11m Buy It Now for only: $18.00 |
 Trimble Magnetic Mount GPS External Patch Antenna P N 56237 50 Original Used $10.55 Time Remaining: 23d 12h 29m Buy It Now for only: $10.55 |
 GlobalSat BU 353 Waterproof USB GPS Receiver Magnetic Mount $11.00 (3 Bids) Time Remaining: 1d 19h 6m |
 Metra 44 US502 Side Mount Replacement Antenna with Triangle Shape Base $12.99 Time Remaining: 27d 15h 52m Buy It Now for only: $12.99 |
 Car Hidden Internal Glass Screen Mount Amplifier Aerial Antenna $4.28 Time Remaining: 29d 3m Buy It Now for only: $4.28 |
 DUAL AMPLIFIED AM FM Car Antenna Window Glass Mount NEW $15.97 Time Remaining: 12h 53m Buy It Now for only: $15.97 |
 Garmin Astro 220 Magnetic Mount Antenna 010 10931 00 $35.99 Time Remaining: 10h 55m Buy It Now for only: $35.99 |
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 Garmin GPS Receiver GPS17 HVS GPS 17HVS Used Condition with Mount $40.00 Time Remaining: 28d 13h 32m Buy It Now for only: $40.00 |
 Car Windshield Mount Electronic FM Radio TV Antenna $0.99 Time Remaining: 1d 20h 17m |
 METRA AW PW12 FULLY AUTOMATIC UNIVERSAL ANTENNA WITH FLSH MOUNTING $24.99 Time Remaining: 16d 11h 21m Buy It Now for only: $24.99 |
 WILSON XM5000 MIRROR MOUNT SATTELLITE RADIO ANTENNA NEW $39.99 Time Remaining: 23d 13h 52m Buy It Now for only: $39.99 |
 Volkswagen VW BEETLE 1966 1979 Pillar Mount am fm Stereo Radio ANTENNA Telescope $21.95 Time Remaining: 3d 12h 54m Buy It Now for only: $21.95 |
 Larsen GPSNMO02 GPS Antenna NMO Truck Mount 28dB $20.99 Time Remaining: 8d 9h 38m Buy It Now for only: $20.99 |
 Universal AM FM Radio Hidden Windshield Mount Camper Car Antenna $4.88 Time Remaining: 14d 20h 52m Buy It Now for only: $4.88 |
 SCOSCHE WMA Windshield Mount Amplified Car Antenna NEW $11.90 Time Remaining: 6d 10h 55m Buy It Now for only: $11.90 |
 Car Stereo Dashboard Mount Wire Harness and Antenna Adapter for Maxima 00 03 $10.00 Time Remaining: 2d 14h 58m Buy It Now for only: $25.00 |
 Glass Window Windscreen Windowshield Mount Car Radio Aerial Antenna $1.00 Time Remaining: 21d 18h 58m Buy It Now for only: $1.00 |
 Metra 44 UA205 Universal Amplified Glass Mount Slim Style Antenna new open box $13.49 Time Remaining: 22d 11h 19m Buy It Now for only: $13.49 |
 METRA 44 UA46 UNIVERSAL AM FM AMPLIFIED ROOF MOUNT ANTENNA W 5M CABLE INCLUDED $33.00 Time Remaining: 23d 15h 24m Buy It Now for only: $33.00 |
 Toyota TACOMA 1995 2004 Flush Flat Mount Stereo Radio POWER ANTENNA with ADAPTER $52.95 Time Remaining: 3d 13h 11m Buy It Now for only: $52.95 |
 Metra Universal Black Car Vehicle Antenna System Top Side mount 1 25mm $15.99 Time Remaining: 4d 14h 2m Buy It Now for only: $15.99 |
 XM TRANS LIGHT TRANSLIGHT SATELLITE RADIO ANTENNA MCX CONNECTOR POLE MOUNT USED $8.84 Time Remaining: 4d 22h 49m Buy It Now for only: $14.84 |
 BRAND NEW RUBBER ROOF MOUNT SWIVEL BASE UNIVERSAL CAR ANTENNA $8.75 Time Remaining: 11d 21h 5m Buy It Now for only: $8.75 |
 Shakespeare 5187 Stainless Steel Ratchet Mount Marine Boat Antenna $45.99 Time Remaining: 25d 14h 38m Buy It Now for only: $45.99 |
 CAR RADIO ANTENNA UNIVERAL PILLAR MOUNT CHROME Datsun 510 toyota nissan $16.99 Time Remaining: 7d 13h 56m Buy It Now for only: $16.99 |
 RUBBER ROOF MOUNT SWIVEL BASE UNIVERSAL CAR ANTENNA $8.99 Time Remaining: 3d 2h 25m Buy It Now for only: $8.99 |
 SIRIUS Satellite Non Magnetic Deck Mount Marine Antenna $69.95 Time Remaining: 22h 38m Buy It Now for only: $69.95 |
 Windshield Mount Electronic Antenna for Car FM Radio AM FM $3.54 Time Remaining: 25d 2h 11m Buy It Now for only: $3.54 |
 LOT OF 2 GPS ANTENNAS WITH CABLES MAGNET MOUNT AND SURFACE MOUNT $6.99 Time Remaining: 4d 18h 2m |
 Toyota CELICA Car am fm Stereo Radio Flat Flush Mount POWER ANTENNA Brand New $52.95 Time Remaining: 15h 40m Buy It Now for only: $52.95 |
 am fm Car Truck Audio Stereo Radio SIDE TOP REAR MOUNT PIVOT and SPRING ANTENNA $33.95 Time Remaining: 3d 13h 11m Buy It Now for only: $33.95 |
 BOOMERANG LOW PROFILE MOBILE TV ANTENNA MAGNETIC MOUNT $56.99 Time Remaining: 7d 23h 31m Buy It Now for only: $56.99 |
 Ford FOCUS am fm Stereo Radio BLACK 17 Spiral Roof Mount ANTENNA MAST New $15.95 Time Remaining: 3d 13h 30m Buy It Now for only: $15.95 |
 Fuba OEM Roof Mount Antenna Kit includes base cables $19.99 Time Remaining: 13d 15h 15m Buy It Now for only: $19.99 |
 Metra 44 UL09 met 44ul09 Universal Retractable Top Mount Antenna $8.49 Time Remaining: 11d 8h 53m Buy It Now for only: $8.49 |
 AERO ANTENNA AT1621 73W IRIDIUM FIXED MAST POLE MOUNT ANTENNA $110.00 Time Remaining: 5d 9h 54m Buy It Now for only: $150.00 |
 Garmin Magnetic Mount Antenna f Astro $31.99 Time Remaining: 1d 14h 50m Buy It Now for only: $31.99 |
 NEW METRA 44 UA44 AMPLIFIED RUBBER ROOF MOUNT ANTENNA $35.00 Time Remaining: 18d 2h 34m Buy It Now for only: $35.00 |
 Car Hidden Internal Glass Screen Mount Amplifier Aerial Antenna $1.00 Time Remaining: 3d 3m Buy It Now for only: $1.00 |
 GARMIN 010 10931 00 ASTRO 220 MAGNETIC MOUNT ANTENNA $31.99 Time Remaining: 17d 10h 41m Buy It Now for only: $31.99 |
 Scosche NN601 1974 1984 Nissan Pillar Mount Antenna $4.99 Time Remaining: 22d 14h 31m Buy It Now for only: $4.99 |
 Garmin GPS 17x HVS Antenna w mount cable $90.00 Time Remaining: 6d 10h Buy It Now for only: $115.00 |
 Internal Glass Screen Mount Amplified Aerial Antenna $1.00 Time Remaining: 25d 17h 20m Buy It Now for only: $1.00 |
 NEW METRA 44 UA30 AMPLIFIED RUBBER ROOF MOUNT ANTENNA $30.95 Time Remaining: 24d 14h 3m Buy It Now for only: $30.95 |
 Metra 44 UT10 44ut10 Universal Top Mount Replacement Antenna for AM FM Bands $8.99 Time Remaining: 12d 9h 12m Buy It Now for only: $8.99 |
 TRAM 1610 HC 5Ft 3DbVHF Marine Radio Coax Antenna White Ratchet Mount Set NEW $49.95 Time Remaining: 22d 15h 22m Buy It Now for only: $49.95 |
 PLYMOUTH Classic COUPE SEDAN 20s 30s 40s 50s SIDE REAR Mount Radio ANTENNA $27.95 Time Remaining: 3d 13h 32m Buy It Now for only: $27.95 |
 Scosche TA402 1981 1995 Toyota Fender Mount Antenna $10.99 Time Remaining: 22d 15h 10m Buy It Now for only: $10.99 |
 Garmin 440 transom mount depth and temperature transducer power cables $75.00 Time Remaining: 5d 9h 20m Buy It Now for only: $135.00 |
 Boat Ship Marine am fm Stereo Radio SIDE TOP REAR MOUNT PIVOT and SPRING ANTENNA $33.95 Time Remaining: 3d 13h 13m Buy It Now for only: $33.95 |
 Toyota 4RUNNER SUV Truck am fm Stereo Radio Flat Flush Mount POWER ANTENNA New $52.95 Time Remaining: 3d 13h 11m Buy It Now for only: $52.95 |
 Metra 44 UP58 Replacement Antenna for Select Universal Pillar Mount Applications $9.99 Time Remaining: 24d 20h 53m Buy It Now for only: $9.99 |
 Wilson 5000 High Power Trunk Mount CB Radio Antenna New $94.99 Time Remaining: 22d 15h 36m Buy It Now for only: $94.99 |
 Universal Removable HL 127 FM Radio Antenna For Car 5mm 6mm Mounting Thread $2.78 Time Remaining: 22d 22h 5m Buy It Now for only: $2.78 |
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