SPECIFICATION Part Number : ILA.01 Product Name : Low Profile and High Efficient 915 MHz ISM Band Loop Antenna Features : Small size antenna, low profile and high efficiency 915 MHz ISM Band 1 dBi Peak Gain 10x3.2x0.5mm size SMT Compatible RoHS Compliant SPE-12-8-079/B/RC Page 1 of 12 1. INTRODUCTION The ILA.01 has excellent stability and sensitivity to consistently provide high signal reception efficiency, 60% at centre frequency and 45% at the edges. Based on the loop effect this antenna works the best when placed on the centre of the edge of the board, working better than traditional linear polarized chip antennas. The antenna at 10x3.2x0.5 mm is low profile and would be suitable for devices with space constraints. The ILA.01 is delivered on tape and reel and now allows M2M customers to use an Omni-directional SMT antenna in devices where orientation of the product is unknown. The ILA.01 Loop antenna can be used in automated meter reading, (AMR), radio frequency identification (RFID), remote monitoring, healthcare, sensing and others. 2. SPECIFICATION ELECTRICAL ANTENNA ILA.01 STANDARD 915 MHz ISM Operation Frequency (MHz) 902-928 MHz Polarization Linear Impedance 50 Ohms Max VSWR (dBi) 2:1 Max Return Loss (dB) -10 Peak Gain 1 dBi Efficiency (%) 50 Average Gain (dB) -3 Radiation Properties Omni-directional Max Input Power 5W * The ILA.01 antenna performance was measured with 80x40 mm ground plane. MECHANICAL Dimensions (mm) 10x3.2x0.5 Required Space (mm) 11x10.4 Material Ceramic EVB Connector SMA-Female SPE-12-8-079/B/RC Page 2 of 12 ENVIRONMENTAL Operation Temperature -40°C to 85°C Storage Temperature -40°C to 105°C Relative Humidity 40% to 95% RoHS Compliant Yes 3. TEST SET UP Z X Y Figure 1. Impedance measurements (left hand) and peak gain, average gain, efficiency and radiation pattern measurements (right hand) SPE-12-8-079/B/RC Page 3 of 12 4. ANTENNA PARAMETERS 4.1. Return Loss Figure 2. Return loss of 915MHz ISM Band Antenna ILA.01 4.2. VSWR Figure 3. VSWR of 915 MHz ISM Band Antenna ILA.01 SPE-12-8-079/B/RC Page 4 of 12 4.3. Efficiency Figure 4. Efficiency of 915 MHz ISM Band Antenna ILA.01 4.4. Peak Gain Figure 5. Peak Gain of 915 MHz ISM Band Antenna ILA.01 4.5. Average Gain SPE-12-8-079/B/RC Page 5 of 12 Figure 6. Average Gain of 915 MHz ISM Band Antenna ILA.01 IV.5. Radiation Pattern Figure 7. Radiation Pattern at 915 MHz of the ILA.01 Antenna. SPE-12-8-079/B/RC Page 6 of 12 5. MECHANICAL DRAWING Figure 8. Mechanical Drawing of the ILA.01 Antenna SPE-12-8-079/B/RC Page 7 of 12 6. INTEGRATION GUIDE SPE-12-8-079/B/RC Page 8 of 12 6.1. Reference ground plane Figure 9. Test evaluation board with antenna. Top layer (left hand) and Bottom layer (right hand). 6.2. Solder Land Pattern Land pattern for soldering is shown in gray, the keep out area of ground plane is shown in green. Figure 10. Solder Area and keep out area SPE-12-8-079/B/RC Page 9 of 12 6.3. Matching circuit The initial matching circuit is LC1= 8.0 pF, LC2= 0Ω and LC3=open circuit. Unless the matching circuit might change depending on ground plane size-shape, PCB, enclosure-material proximity and others. We recommend contacting taoglas for tuning services. Figure 11. Recommended matching circuit 6.4. Recommendations Route the Co-Planar Waveguide (CPW) with curvy turns. Allocate the antenna on the longest side of the board. Center the antenna at the edge of the board. The antenna must be at the limit of the ground plane on the selected edge. Keep the “L” distance maximum 3 times the width of the CPW signal track, from the edge of the CPW ground to the keep out area of the antenna. Keep the matching circuit close to the antenna. Keep the “W” distance as the width of that GND pad. Keep the antenna 1 mm away from the enclosure. The CPW dimensions will change depending on PCB. Keep low profile components such as lumped, IC, etc, min 2 mm away from the edge of the keep out area or antenna, at top and bottom layers. Keep high profile components such as batteries, connectors, etc, 5 mm away from the edge of the keep out area or antenna, at top and bottom layers. SPE-12-8-079/B/RC Page 10 of 12 7. RECOMMENDED REFLOW TEMPERATURE PROFILE The ILA01 Loop Antenna can be assembled following either Sn-Pb or Pb-Free assembly processes. The recommended soldering temperatures are as follows: SPE-12-8-079/B/RC Page 11 of 12 8. PACKAGING The ILA.01 antennas are delivered in tape and reel with EIA 481-B polystyrene with 6000 pieces per reel. Figure 12. Tape description for the ILA.01 Figure 13. Tape dimensions for the ILA.01. SPE-12-8-079/B/RC Page 12 of 12