Chip Antenna - VISHAY - #1

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VJ 3505 UHF Chip Antenna for Mobile Devices www.vishay.com For technical questions, contact: mlcc@vishay.com Document Number: 45158 20 Revision: 26-Aug-10 VJ 3505 Vishay Vitramon The company’s products are covered by one or more of the following: WO2008250262 (A1), US2008303720 (A1), US2008305750 (A1), WO2008154173 (A1). Other patents pending. DESCRIPTION The VJ 3505 multi-layer ceramic chip antenna is a small form-factor, high-performance, chip-antenna designed for TV reception in mobile devices in the UHF band. It allows mobile TV device manufacturers to design high quality products that do not bear the penalty of a large external antenna. Utilizing Vishay's unique materials and manufacturing technologies, this product complies with the MBRAI standard while maintaining a small outline. Focusing on consumer applications, the antenna is designed to be assembled onto a PC board in the standard reflow process. Target customers of the VJ 3505 are mobile phone makers, portable multimedia device makers, notebook OEMs and ODMs, and accessory card OEMs and ODMs. FEATURES • Small outline (35 mm x 5 mm x 1.2 mm) • Omni-directional, linear polarization • Complies with MBRAI standard • Complete UHF band coverage (470 MHz to 860 MHz) up to 1.1 GHz • Requires a tuning circuit and ground plane for optimal performance • Standard SMT assembly • 50 Ù unbalanced interface • Operating temperature range (- 40 °C to + 85 °C) • Reference design and evaluation boards available upon request • Compliant to RoHS directive 2002/95/EC APPLICATIONS • Mobile UHF TV receivers including DVB-T, DVB-H, ISDB-T, CMMB, ATSC, and MediaFLO devices ANTENNA PERFORMANCE Peak gain and efficiency The antenna radiation characteristics are influenced by several factors including ground plane dimensions and impedance matching network. The antenna parameters presented hereafter were simulated according to the ground plane configuration suggested by the VJ 3505 evaluation board. Figure 1. shows simulated peak gain and radiation efficiency over frequency throughout the UHF band, compared with the MBRAI requirements. Fig. 1 - Peak Gain and Efficiency vs. Frequency VJ 3505 Simulated Antenna Parameters - 12 - 10 - 8 - 6 - 4 - 2 0 2 Frequency (MHz) Radiation Efficiency (dB) 470 520 570 620 670 720 770 820 870 Radiation Efficiency MBRAI Peak Gain