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VJ 3505
Vishay Vitramon
VJ 3505 UHF Chip Antenna for Mobile Devices
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 unbalanced interface Operating temperature range (- 40 C to + 85 C)
The company's products are covered by one or more of the following: WO2008250262 (A1), US2008303720 (A1), US2008305750 (A1), WO2008154173 (A1). Other patents pending.
* Reference design and evaluation boards available upon request * Compliant to RoHS directive 2002/95/EC
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.
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.
2 0 Radiation Efficiency (dB) -2 -4 -6
VJ 3505 Simulated Antenna Parameters Peak Gain
Radiation Efficiency MBRAI
-8 - 10 - 12 470
520
570
620 670 720 Frequency (MHz)
770
820
870
Fig. 1 - Peak Gain and Efficiency vs. Frequency
Document Number: 45158 Revision: 15-Jun-10
For technical questions, contact: mlcc@vishay.com
www.vishay.com 1
VJ 3505
Vishay Vitramon
RADIATION PATTERN
The 3D planes of VJ 3505 are defined in figure 2.
Z
VJ 3505 UHF Chip Antenna for Mobile Devices
Y
X
Fig. 2 - VJ 3505 3D Plane Definition
Figure 3. displays the simulated 3D radiation pattern at 550 MHz. The general pattern shape does not change with frequency.
Fig. 3 - Simulated Radiation Pattern at 550 MHz
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For technical questions, contact: mlcc@vishay.com
Document Number: 45158 Revision: 15-Jun-10
VJ 3505
VJ 3505 UHF Chip Antenna for Mobile Devices
Vishay Vitramon
FOOTPRINT AND MECHANICAL DIMENSIONS
The antenna footprint and mechanical dimensions are presented in figure 6. For mechanical support, it is recommended to add one or two drops of heat curing epoxy glue. The glue dot should not overlap with any of the soldering pads. It is recommended to apply the glue dot at the center of the antenna, as shown by the diagonal pattern. For more details see "VJ 3505 assembly guidelines" section below.
0.25 4.5 1 1 9 9 1 9 0.25
1
0.25
5 0.25 1
Apply glue in this area
35 All dimensions in mm Figure not in scale
RF feed connects here
Fig. 4 - VJ 3505 Footprint DIMENSIONS Length Width Height (mm) 35 + 0.5/-0 5 + 0.5/-0 1.2 0.1
VJ 3505 ASSEMBLY GUIDELINES
1. Mounting of antennas on a printed circuit board should be done by reflow soldering. The reflow soldering profiles are shown below. 2. In order to provide the adequate strength between the antenna and the PCB the application of a dot of heat cured epoxy glue in the center of the footprint of the antenna prior to the antenna's soldering to the board should be done. An example for such glue could be Heraeus PD 860002 SA. The weight of the dot should be 5 mg to 10 mg.
300 T (C) 250 > 215 C: 20 s to 40 s 200 Max. temperature
150 Min. temperature 100 Sn-Pb eutectic solder paste
50
0 30 s to 60 s 30 s to 60 s 30 s to 60 s Time
Fig. 5 - Soldering IR Reflow with SnPb Solder
Document Number: 45158 Revision: 15-Jun-10
For technical questions, contact: mlcc@vishay.com
www.vishay.com 3
VJ 3505
Vishay Vitramon
VJ 3505 UHF Chip Antenna for Mobile Devices
300 T (C) 250
10 s 260 C 245 C 215 C 10 s 40 s
200 180 C 150 130 C
100 2 K/s 50
0 50 100 150 200 t (s) 250
Fig. 6 - Soldering Reflow with Sn Solder
300 T (C) 250
Max. temperature
200
Sn-Ag-Cu solder paste
150 Min. temperature
100
50
0 30 s to 60 s 60 s to 120 s 60 s to 120 s 60 s to 120 s Time
Fig. 7 - Soldering IR Reflow with SnAgCu Solder
ORDERING INFORMATION VJ 3505
VISHAY MATERIAL VJ3505M011SXMSRA0
PACKAGING QUANTITY 1000 pieces
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For technical questions, contact: mlcc@vishay.com
Document Number: 45158 Revision: 15-Jun-10
Legal Disclaimer Notice
Vishay
Disclaimer
All product specifications and data are subject to change without notice. Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, "Vishay"), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product. Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any information provided herein to the maximum extent permitted by law. The product specifications do not expand or otherwise modify Vishay's terms and conditions of purchase, including but not limited to the warranty expressed therein, which apply to these products. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by any conduct of Vishay. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for such applications. Product names and markings noted herein may be trademarks of their respective owners.
Document Number: 91000 Revision: 18-Jul-08
www.vishay.com 1

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