document number: 45158 for technical questions, contact: mlcc@vishay.com www.vishay.com revision: 02-jul-09 1 vj 3505 uhf chip antenna for mobile devices 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 t he 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) ? requires a tuning circuit and ground plane for optimal performance ? standard smt assembly ?50 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 and mediaflo devices antenna performance peak gain and efficiency the antenna radiation charac teristics 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. v j 3505 sim u lated antenna parameters - 12 - 10 - 8 - 6 - 4 - 2 0 2 fre qu ency (mhz) radiation efficiency (db) 470 520 570 620 670 720 770 8 20 8 70 fig u re 1. peak gain and efficiency v s. fre qu ency radiation efficiency mbrai peak gain
www.vishay.com for technical questions, contact: mlcc@vishay.com document number: 45158 2 revision: 02-jul-09 vj 3505 vishay vitramon vj 3505 uhf chip antenna for mobile devices radiation pattern the 3d planes of vj 3505 are defined in figure 2. figure 3. displays the simulated 3d radiation pattern at 550 mhz. the general pattern shape does not change with frequency. x z y fig u re 2. v j 3505 3d plane definition fig u re 3. sim u lated radiation pattern at 550 mhz
document number: 45158 for technical questions, contact: mlcc@vishay.com www.vishay.com revision: 02-jul-09 3 vj 3505 vj 3505 uhf chip antenna for mobile devices vishay vitramon footprint and mechanical dimensions the antenna footprint and mechanical dimens ions 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 th e antenna, as shown by the diagonal pattern. for more details see 'vj 3505 assembly guidelines' section below. vj 3505 assembly guidelines 1. mounting of antennas on a printed circ uit board should be done by reflow solderin g. the reflow soldering profiles are shown below. 2. in order to provide the adequate str ength between the antenna and the pcb the app lication 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 suc h glue could be heraeus pd 860002 sa. the weight of the dot should be 5 mg to 10 mg. 4.5 rf feed connects here all dimensions in mm fig u re not in scale 35 0.25 0.25 1 1 1 99 9 1 1 apply gl u e in this area 0.25 0.25 5 fig u re 4. v j 3505 footprint dimensions (mm) length 35 + 0.5/-0 width 5 + 0.5/-0 height 1.2 0.1 time 30 s to 60 s 30 s to 60 s 30 s to 60 s 0 50 100 150 200 250 300 t (c) > 215 c: 20 s to 40 s max. temperat u re min. temperat u re sn-p b e u tectic solder paste fig u re 5. soldering ir reflo w w ith snp b solder
www.vishay.com for technical questions, contact: mlcc@vishay.com document number: 45158 4 revision: 02-jul-09 vj 3505 vishay vitramon vj 3505 uhf chip antenna for mobile devices t (s) 0 50 100 150 200 250 300 t (c) 260 c 50 100 150 200 250 245 c 215 c 1 8 0 c 130 c 40 s 10 s 10 s 2 k/s fig u re 6. soldering reflo w w ith sn solder ? ? 0 50 100 150 200 250 300 t (c) time 60 s to 120 s 30 s to 60 s max. temperat u re min. temperat u re sn-ag-c u solder paste fig u re 7. soldering ir reflo w w ith snagc u solder 60 s to 120 s 60 s to 120 s ordering information vishay material packaging quantity vj 3505 VJ3505m011sxmsra0 1000 pieces
document number: 91000 www.vishay.com revision: 18-jul-08 1 disclaimer legal disclaimer notice vishay 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 fo r any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product. vishay disclaims any and all li ability arising out of the use or application of any product describ ed herein or of any information provided herein to the maximum extent permit ted by law. the product specifications do not expand or otherwise modify vishay?s terms and conditions of purcha se, 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 medi cal, 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.
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