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 cera mic 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 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 pr esented 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 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 radiation efficiency mbrai peak gain
document number: 45158 for technical questions, contact: mlcc@vishay.com www.vishay.com revision: 26-aug-10 21 vj 3505 vj 3505 uhf chip anten na for mobile devices vishay vitramon radiation pattern the 3d planes of vj 3505 are defined in figure 2. fig. 2 - vj 3505 3d plane definition figure 3. displays the simulated 3d radiat ion pattern at 550 mhz. t he general pattern shape does not change with frequency. fig. 3 - simulated radiation pattern at 550 mhz x z y
www.vishay.com for technical questions, contact: mlcc@vishay.com document number: 45158 22 revision: 26-aug-10 vj 3505 vishay vitramon vj 3505 uhf chip antenna for mobile devices fig. 4 displays the measured radiation patterns of vj 3505 evalua tion board in the yz plane as defined in fig. 2. zero degrees is defined at the z axis, stepping clockwise. fig. 4 - measured radiation pattern footprint and mechanical dimensions the antenna footprint and mechanical dimensio ns are presented in figure 5. for mechanical support, it is recommended to add one or two drops of heat curing epoxy glue. the glue dot shoul d not overlap with any of the soldering pads. it is recommended to apply the glue dot at the ce nter of the antenna, as shown by the diagonal pattern. for more details see ?vj 3505 assembly guidelines? section below. fig. 5 - vj 3505 footprint 30 60 90 120 150 180 210 240 270 300 330 0 - 10 - 20 - 50 - 40 - 30 500 mhz - gain (dbi) vs. angle () 30 60 90 120 150 180 210 240 270 300 330 0 - 10 - 20 - 50 - 40 - 30 600 mhz - gain (dbi) vs. angle () 30 60 90 120 150 180 210 240 270 300 330 0 - 20 - 50 - 40 - 30 700 mhz - gain (dbi) vs. angle () 30 60 90 120 150 180 210 240 270 300 330 0 - 10 - 20 - 50 - 40 - 30 862 mhz - gain (dbi) vs. angle () - 10 4.5 rf feed connects here all dimensions in mm fig u re not in scale 35 0.25 0.25 1 1 1 9 9 9 1 1 apply gl u e in this area 0.25 0.25 5 dimensions (mm) length 35 + 0.5/-0 width 5 + 0.5/-0 height 1.2 0.1
document number: 45158 for technical questions, contact: mlcc@vishay.com www.vishay.com revision: 26-aug-10 23 vj 3505 vj 3505 uhf chip anten na for mobile devices vishay vitramon 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 f ootprint of the antenna prio r 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. fig. 6 - soldering ir reflow with snpb solder fig. 7 - soldering reflow with sn solder 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 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 ? ?
document number: 45158 for technical questions, contact: mlcc@vishay.com www.vishay.com revision: 26-aug-10 24 vj 3505 vj 3505 uhf chip anten na for mobile devices vishay vitramon fig. 8 - soldering ir reflow with snagcu 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 60 s to 120 s 60 s to 120 s ordering information vishay material packaging quantity vj 3505 vj3505m011sxmsra0 1000 pieces
document number: 91 000 www.vishay.com revision: 11-mar-11 1 disclaimer legal disclaimer notice vishay all product, product specifications and data ar e subject to change without notice to improve reliability, function or design or otherwise. vishay intertechnology, inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectivel y, vishay), disclaim any and all liability fo r any errors, inaccuracies or incompleteness contained in any datasheet or in any o ther disclosure relating to any product. vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or the continuing production of any product. to the maximum extent permitted by applicab le law, vishay disc laims (i) any and all liability arising out of the application or use of any product, (ii) any and all liability, incl uding without limitation specia l, consequential or incidental dama ges, and (iii) any and all impl ied warranties, including warran ties of fitness for particular purpose, non-infringement and merchantability. statements regarding the suitability of pro ducts for certain types of applications are based on vishays knowledge of typical requirements that are often placed on vishay products in gene ric applications. such statements are not binding statements about the suitability of products for a partic ular application. it is the customers responsibility to validate that a particu lar product with the properties described in th e product specification is su itable for use in a particul ar application. parameters provided in datasheets an d/or specifications may vary in different applications and perfo rmance may vary over time. all operating parameters, including typical pa rameters, must be validated for each customer application by the customers technical experts. product specifications do not expand or otherwise modify vishays term s and conditions of purchase, including but not limited to the warranty expressed therein. except as expressly indicated in writing, vishay products are not designed for use in medical, life-saving, or life-sustaining applications or for any other application in which the failure of the vishay product co uld result in person al injury or death. customers using or selling vishay products not expressly indicated for use in such applications do so at their own risk and agr ee to fully indemnify and hold vishay and it s distributors harmless from and against an y and all claims, liabilities, expenses and damages arising or resulting in connection with such use or sale, including attorneys fees, even if such claim alleges that vis hay or its distributor was negligent regarding the design or manufact ure of the part. please contact authorized vishay personnel t o obtain written terms and conditions regarding products designed fo r such applications. no license, express or implied, by estoppel or otherwise, to any intelle ctual property rights is gran ted by this document or by any conduct of vishay. product names and markings noted herein may be trademarks of their respective owners.
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