ANTENNA SELECTION GUIDEFORTHE 868 MHZ EZRADIO® AND EZRADIOPRO® DESIGNS
This document describes the nine different 50Ω single-ended antenna types used in the easy-to-use 68 MHz Antenna Matrix (WES0030-01-AMS868-01), which is dedicated to the EZRadio and EZRadioPRO family. Using the development tool, the reader can test the performance of the Silicon Labs' RFIC radio family with different types of antennas and then find the best solution for the application in terms of shape, size, cost, and expected range.
The antenna types in the matrix are selected for the most common application areas in the 868 MHz band. The antennas are optimized and tuned for the antenna PCB + Pico Board + Motherboard (MSC-WMB930 Wireless Motherboard) structure (see Figure 1).
The input impedance, radiation pattern, and antenna gain of every antenna type in the Matrix are measured with the above configuration. The outdoor range is also checked using two identical antenna modules at the two sides of the link. The results are given in a separate document containing measurement reports for each antenna type.
In typical costumer cases the antennas are applied without the nearby Pico Board and Motherboard, and therefore their effects disappear. Since all customer applications are different, the right solution may not be found among these fixed size, fixed form factor Matrix antennas.
For these outlying cases, Silicon Labs recommends the user modify/tune the printed ILA (Inverted L Antenna) and IFA (Inverted F Antenna) types, which are customizable in terms of length and performance. Silicon Labs provides an easy-to-understand, simple, step-by-step tuning process description in the Application Note entitled "Antenna Design Guide for Single-Ended 50Ω Antennas". Use this Application Note to customize and optimize the performance of these antennas.
The current Matrix is designed for 50 single-ended solutions. Another matrix will be devoted to the differential,high-impedance antennas, which are supported by the Si4010 /12/ RF IC family.
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EZRADIO® 、 EZRADIOPRO® 、 WES0030-01-AMS868-01 、 EZRadio 、 EZRadioPRO 、 MSC-WMB930 、 Si4x55 、 Si4456 、 Si446x |
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Application note & Design Guide |
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Please see the document for details |
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