ANT-915-USP410

microSplatch™ ANT-915-uSP410 915 MHz LPWA Weatherproof Antenna The microSplatch™ uSP410 915 MHz antenna is a surface-mount monopole antenna for embedded Sub-1 GHz and low-power, wide-area (LPWA) applications including LoRaWAN®, remote controls, and ISM applications in the 902 MHz to 928 MHz band. uSP410 series monopole antennas use a grounded-line technique to achieve outstanding performance in a compact surface-mount package. The uSP410 series exhibits low proximity effect, making it a good embedded antenna choice for devices typically subject to nearby interferers. uSP410 series antennas are available in tape and reel packaging and are designed for reflow-solder mounting directly to a printed circuit board for high- volume applications. FEATURES APPLICATIONS • Performance at 902 MHz to 928 MHz – VSWR: ≤ 2.7 – Peak Gain: 0.9 dBi – Efficiency: 27% • Low-power, wide-area (LPWA) applications – LoRaWAN® – Sigfox® – WiFi HaLow™ • Omnidirectional radiation pattern • Compact package – 13.2 mm x 9.1 mm x 2.9 mm • Remote sensing, monitoring and control – Security systems – Industrial machinery • Direct surface-mount PCB attachment • Internet of Things (IoT) devices • Reflow- or hand-solder assembly • ISM applications • Resistant to proximity effect from nearby interferers • Smart Home networking • Hand-held devices • Excellent performance with small ground plane (38 mm x 84 mm) ORDERING INFORMATION Part Number Description ANT-915-uSP410 915 MHz microSplatch antenna on tape and reel (1000 per reel) AEK-915-uSP410 915 MHz microSplatch antenna evaluation kit Available from Linx Technologies and select distributors and representatives. DATA AND DEVICES / MICROSPLATCH™ ANT-915-USP410 TABLE 1. ELECTRICAL SPECIFICATIONS ANT-915-uSP410 VSWR (max) Peak Gain (dBi) Average Gain (dBi) Efficiency (%) Polarization Radiation Max Power Wavelength Electrical Type Impedance Connection Weight Dimensions Operating Temperature Range ESD Sensitivity 902 MHz to 928 MHz 2.7 0.9 -5.8 27 Linear Omnidirectional 5W 1/4-wave Monopole 50 Ω Surface-mount 0.6 g (0.02 oz) 13.2 mm x 9.1 mm x 2.9 mm (0.52 in x 0.36 in x 0.11 in) -40 °C to +130 °C NOT ESD sensitive. As a best practice, Linx may use ESD packaging. Electrical specifications and plots measured with a 38 mm x 84 mm (1.5 in x 3.3 in) reference ground plane. VSWR Figure 1 provides the voltage standing wave ratio (VSWR) across the antenna bandwidth. VSWR describes the power reflected from the antenna back to the radio. A lower VSWR value indicates better antenna performance at a given frequency. Reflected power is also shown on the right-side vertical axis as a gauge of the percentage of transmitter power reflected back from the antenna. 5 928 902 VSWR response typically shifts lower in frequency when the antenna is in proximity to an enclosure or printed circuit board. By allowing for this shift in the antenna design, the need for complex matching circuits is reduced. VSWR 4 30 3 20 2 10 1 0 900 905 910 915 Frequency (MHz) 920 925 930 Reflected Power (%) 40 Figure 1. ANT-915-uSP410 VSWR DATA AND DEVICES / MICROSPLATCH™ ANT-915-USP410 2 RETURN LOSS 0 928 902 The peak gain across the antenna bandwidth is shown in Figure 2. Peak gain represents the maximum antenna input power concentration across 3-dimensional space, and therefore peak performance at a given frequency, but does not consider any directionality in the gain pattern. -2 Return Loss (dB) -4 -6 -8 -10 -12 -14 -16 -18 -20 900 905 910 915 Frequency (MHz) 920 925 930 Figure 2. ANT-915-uSP410 Return Loss PEAK GAIN Peak Gain (dBi) 5 928 902 The peak gain across the antenna bandwidth is shown in Figure 3. Peak gain represents the maximum antenna input power concentration across 3-dimensional space, and therefore peak performance at a given frequency, but does not consider any directionality in the gain pattern. 0 -5 -10 900 905 910 915 Frequency (MHz) 920 925 930 Figure 3. ANT-915-uSP410 Peak Gain DATA AND DEVICES / MICROSPLATCH™ ANT-915-USP410 3 AVERAGE GAIN Average Gain (dBi) 5 928 902 Average gain (Figure 4), is the average of all antenna gain in 3-dimensional space at each frequency, providing an indication of overall performance without expressing antenna directionality. 0 -5 -10 900 905 910 915 Frequency (MHz) 920 925 930 Figure 4. ANT-915-uSP410 Average Gain RADIATION EFFICIENCY 100 928 902 Radiation efficiency (Figure 5), shows the ratio of power delivered to the antenna relative to the power radiated at the antenna, expressed as a percentage, where a higher percentage indicates better performance at a given frequency. 90 80 Efficiency (%) 70 60 50 40 30 20 10 0 900 905 910 915 Frequency (MHz) 920 925 930 Figure 5. ANT-915-uSP410 Radiation Efficiency DATA AND DEVICES / MICROSPLATCH™ ANT-915-USP410 4 PRODUCT DIMENSIONS 13.2 mm (0.52 in) 9.1 mm (0.36 in) 1 2.9 mm (0.11 in) ANT-fffuSP410 10.2 mm (0.40 in) Figure 6. uSP410 Series Antenna Dimensions PRODUCT SIGNALS The signal definitions for the uSP410 are provided in Figure 7. Function Description Rx/Tx Castellation marked as “1” GND Unmarked castellation 13.2 (0.52 Figure 7. uSP410 Series Pin-Out Table PROXIMITY EFFECT Wireless devices are often designed based on antenna performance measured on an evaluation9.1 board. mm In practice, however, many wireless devices are used in the presence of materials near the antenna were not (0.36which in) present during evaluation. These materials, such as batteries, components on the PCB, or even a person’s body or hand1, can cause a shift in the frequency performance of the antenna, resulting in less than optimal device performance. The shift in the frequency performance can be quite dramatic, especially for monopole (1/4 wavelength) antennas. 1 ANT uSP The uSP410 Series antennas are designed to help reduce the impact of nearby objects on the performance of the antenna by using a grounded line technique to reduce the overall length of the antenna radiator to provide wider bandwidth for better immunity to frequency shifts, while using a multilayer PCB to maintain a lower profile and small size. Matching components can be added, if necessary, to mitigate larger proximity effects from features like metal shields or enclosures. 10.2 (0.40 DATA AND DEVICES / MICROSPLATCH™ ANT-915-USP410 5 RADIATION PATTERNS Radiation patterns provide information about the directionality and 3-dimensional gain performance of the antenna by plotting gain at specific frequencies in three orthogonal planes. Antenna radiation patterns are shown in Figure 8 using polar plots covering 360 degrees. The antenna graphic provides reference to the plane of the plots below it. Note: when viewed with typical PDF viewing software, zooming into radiation patterns is possible to reveal fine detail. XZ-Plane Gain YZ-Plane Gain XY-Plane Gain 902 MHZ TO 928 MHZ ( 915 MHZ) 34 35 33 32 31 30 29 28 36 5 0 -5 -10 -15 -20 -25 -30 -35 -40 -45 -50 1 2 3 4 34 5 33 6 32 7 31 8 27 26 30 9 29 10 28 11 27 12 25 13 24 21 20 19 18 17 1 2 3 4 34 5 6 31 8 30 9 29 10 28 11 27 12 13 14 23 15 22 XZ-Plane Gain 32 7 24 16 21 20 19 18 17 35 33 25 15 22 36 5 0 -5 -10 -15 -20 -25 -30 -35 -40 -45 -50 26 14 23 35 16 YZ-Plane Gain 36 5 0 -5 -10 -15 -20 -25 -30 -35 -40 -45 -50 1 2 3 4 5 6 7 8 9 10 11 26 12 25 13 24 14 23 15 22 21 20 19 18 17 16 902 MHz 915 MHz 930 MHz XY-Plane Gain Figure 8. ANT-915-uSP410 Radiation Patterns DATA AND DEVICES / MICROSPLATCH™ ANT-915-USP410 6 RECOMMENDED LAYOUT The recommended printed circuit board (PCB) layout for the uSP410 antenna series is shown in Figure 9. This layout is used for the uSP410 series evaluation board which is available for purchase as listed under Ordering Information. Contact Linx for availability of PCB layout design files. The recommended layout includes a matching network, ground plane and PCB transmission line from the 1.5 mm to 2 mm antenna to the matching network, and to the connector or radio circuitry. (0.06 in to 0.08 in) Top layer keep out zone ANTENNA PLACEMENT Antenna placement should be such that the feedline (marked 1) is near to the corner of the ground plane to allow a maximum diagnonal ground plane length for the antenna counterpoise. The antenna should have a minimum of 5 mm of clearance from circuitry and ground plane on non-attaching sides, and no ground plane or circuitry underneath the antenna. MATCHING NETWORK Linx recommends inclusion of at least a 3-element, surface mount pi matching network of two parallel capacitors, (C1, C2) and one serial inductor, (L1) in all designs (Figure 10). Surface mount components should be 0603 size. 0402 size components are also supported. The uSP410 series antennas, as designed, do not require matching, but matching may improve end-product antenna performance depending on the effects of the enclosure, PCB and other electronic components. If no matching is necessary, the serial element may be populated with a zero-ohm resistor and no components in the two capacitor positions. This is the configuration of the Linx evaluation board as supplied. Linx believes in wireless made simple® and offers matching network design support. ANT-fff1 uSP410 C2 C2 Pi matching circuit L1 L1 50 Ω microstrip feedline on top layer ANTENNA C1 L1 Ground plane on bottom layer for counterpoise C2 C1 2-Element L1 C1 GND C1 GND Figure 9. Linx uSP410 Series Recommended Layout. 3-Element L1 C1 4-Element C1 C2 C2 L1 L2 Figure 10. Matching Network Recommendation DATA AND DEVICES / MICROSPLATCH™ ANT-915-USP410 7 RECOMMENDED PCB FOOTPRINT Figure 11 shows the recommended printed circuit board footprint and spacing for uSP410 series antennas. The footprint recommendation should be used in conjunction with the recommended layout configuration shown in Figure 9. 10.2 mm (0.40 in) No ground plane or traces under antenna. 2x Solder pads 2.0 mm x 2.5 mm (0.08 in x 0.10 in) C2 L1 ne 50 Ω microstrip feedline on top layer Ground plane on bottom layer for counterpoise C1 Ground plane area = 38 mm x 84 mm (1.5 in x 3.3 in) om layer Figure 11. uSP410 Series Antenna Placement on PCB. GROUND PLANE The ANT-915-uSP410 is a 1/4 wave monopole antenna, and requires a ground plane on the PCB to which it is mounted. Linx recommends a minimum 38 mm x 84 mm or larger ground plane. The uSP410 should be mounted at the top edge of the ground plane, (See Figure 9) and none of the ground plane should be underneath the antenna. Other ground plane sizes and antenna mounting locations are possible. Simulated performance data for different ground plane sizes can be found in the application note, microSplatch™ uSP410 Series Ground Plane Optimization, on the Linx website. Linx offers PCB design reviews to help optimize solution performance. TRANSMISSION LINES FOR EMBEDDED ANTENNAS For most designs, Linx recommends a microstrip transmission line for the uSP410 series. A microstrip transmission line is a PCB trace that runs over a ground plane to maintain the characteristic impedance for optimal signal transfer between the antenna and radio circuitry. Linx designs all antennas with a characteristic impedance of 50 Ω. Important practices to observe when designing a transmission line are: • Keep all transmission lines to a minimum length for best signal performance • Use RF components that also operate at a 50 Ω impedance • If the radio is not on the same PCB as the antenna, the microstrip should be terminated in a connector, as exemplified on the uSP410 evaluation board, enabling a shielded cable to complete the antenna connection to the radio • For designs subject to significant electromagnetic interference, a coplanar waveguide transmission line may be used on the PCB The design of a PCB transmission line can be aided by many commercially available software packages which can calculate the correct transmission line width and gap dimensions based upon the PCB thickness and dielectric constant used. Linx offers PCB design reviews to help optimize solution performance. DATA AND DEVICES / MICROSPLATCH™ ANT-915-USP410 8 REFLOW SOLDER PROFILE The uSP410 series antennas use a typical RoHS solder reflow profile. Refer to application note, AN-00504, on the Linx website for more information. TAPE AND REEL PACKAGING Figure 12 shows the dimensions of the tape in which the uSP410 series are packaged. Reel dimensions are provided in Figure 13. Tape Dimensions P5 P3 D1 P4 D2 P2 ANT-fffuSP410 W F P1 T2 T3 T4 Figure 12. Tape Specifications for the uSP410 Series Antenna Symbol Dimension (mm) Tolerance D1 1.50 ± 0.10 D2 1.50 ± 0.10 F 13.00 ± 0.10 P1 16.00 ± 0.10 P2 11.50 ± 0.10 P3 1.75 ± 0.10 P4 4.00 ± 0.10 P5 2.00 ± 0.10 T2 0.35 ± 0.05 T3 9.45 ± 0.10 T4 3.20 ± 0.10 W 24.00 ± 0.30 W1 E C B A Reel Dimensions Symbol uSP410 Unit QTY per reel 1,000 pcs Tape width 24.00 mm A Ø 330 ±1 mm B Ø 100 ±0.5 mm C Ø 13.00 ±0.2 mm E 2.2 ±0.5 mm W 24 ±0.5 mm W1 28.4 ±0.2 mm W Figure 13. Reel Specifications for the uSP410 Series Antenna DATA AND DEVICES / MICROSPLATCH™ ANT-915-USP410 9 RADIATION PATTERNS Radiation patterns provide information about the directionality and 3-dimensional gain performance of the antenna by plotting gain at specific frequencies in three orthogonal planes. Antenna radiation patterns for a free space orientation are shown in Figure 16 using polar plots covering 360 degrees. The antenna graphic at the top of the page provides reference to the plane of the column of plots below it. Note: when viewed with typical PDF viewing software, zooming into radiation patterns is possible to reveal fine detail. RADIATION PATTERNS - STRAIGHT, NO GROUND PLANE XZ-Plane Gain YZ-Plane Gain XY-Plane Gain 902 MHZ TO 930 MHZ ( 915 MHZ) 34 35 33 32 31 30 29 28 36 5 0 -5 -10 -15 -20 -25 -30 -35 -40 -45 -50 1 2 3 4 34 5 33 6 32 7 31 8 27 26 30 9 29 10 28 11 27 12 25 13 24 21 20 19 18 17 1 2 3 4 34 5 6 30 9 29 10 28 11 27 12 13 14 15 22 XZ-Plane Gain 31 8 23 16 32 7 24 21 20 19 18 17 35 33 25 15 22 36 5 0 -5 -10 -15 -20 -25 -30 -35 -40 -45 -50 26 14 23 35 16 YZ-Plane Gain 36 5 0 -5 -10 -15 -20 -25 -30 -35 -40 -45 -50 1 2 3 4 5 6 7 8 9 10 11 26 12 13 25 24 14 23 15 22 21 20 19 18 XY-Plane Gain 17 16 902 MHz 915 MHz 930 MHz Figure 16. Radiation Patterns for ANT-915-IPW1-RPS, Straight PACKAGING INFORMATION The ANT-915-IPW1-RPS antenna is packaged in a clear plastic bag. Distribution channels may offer alternative packaging options. DATA AND DEVICES / MICROSPLATCH™ ANT-915-USP410 10 TE TECHNICAL SUPPORT CENTER USA: +1 (800) 522-6752 Canada: +1 (905) 475-6222 Mexico: +52 (0) 55-1106-0800 Latin/S. 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Useful lifetime of the original end product may vary but is not warrantied to exceed one (1) year from the original date of the end product purchase. ©2022 TE Connectivity. All Rights Reserved. 09/22   Original DATA AND DEVICES / MICROSPLATCH™ ANT-915-USP410