rfid pcb - results edaboard.com

how to find inductance of rfid multiturn loop antenna

dear all,i have designed one rfid pcb loop antenna,how can i calculate the inductance of the antenna?i dont have lcr meter or any other measuring instruments,if i will get the inductance from that i can able to calculate total parallel capacitance,no...
RF, Microwave, Antennas and Optics :: 02 Nov 2009 14:25 :: sr_raval :: Replies: 6 :: Views: 219

how to design a magnetic near field microstrip antenna

hi. i am currently designing an antenna that needs to have a high magnetic field strength. is there any specific features or golden rule that i need to follow on to get something out? thanks in advance....
RF, Microwave, Antennas and Optics :: 13 Aug 2009 13:25 :: ntstatic :: Replies: 5 :: Views: 565

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rfid project

i am building an integrated rfid system capable of quickly identifying objects by their rfid tags. the system will be able to read and write tags. read data will be store in a database through a middleware.i intend this system to be installed in libr...
Microcontrollers :: 09 Aug 2009 1:16 :: doraemon :: Replies: 10 :: Views: 1773

help me budget. in house design or outsource?

re you are all very busy) but im a lone engineer in thailand on this project without anyone else to talk to. ive been assigned a project requiring 2 distinct rf components and pcb antennas. i need an rfid chip at 13.56 mhz and an 802.15.4 (or equival...
RF, Microwave, Antennas and Optics :: 06 Aug 2009 19:06 :: micky74 :: Replies: 1 :: Views: 282

high-school student want to design a simple rfid antenna

good morning everyone, i have a project which is so important for me where i need to built a simple rfid antenna, i dont know how to start, which sources could help? the frequency should be 13.56 mhz>> how l is should be???i am really lost in this a...
RF, Microwave, Antennas and Optics :: 17 Apr 2009 16:17 :: salehmag :: Replies: 7 :: Views: 822

final year project ideas needed....!!!!

hi can anyone suggest me about some good feasible project related to ectronics and telecom covering both fields...!!!!:d...
Electronic Elementary Questions :: 08 Dec 2008 10:57 :: caribbeanboy :: Replies: 23 :: Views: 4592

magnetic door system

hi all , i have encounted problems in building up the magnetic lock device circuit, controlled by 8051.plz enlighten me if anyone know. thanks...
Hobby Circuits and Small Projects Problems :: 29 Aug 2008 7:01 :: devilmp4 :: Replies: 16 :: Views: 432

where may get the mf rc531 orcad library

hi, i am design a rfid pcb with mf rc531 chip,i am looking for an orcad library for rc531 schematic, please notice me where i may get it....
Professional Hardware and Electronics Design :: 26 Aug 2008 14:15 :: Yeeching :: Replies: 7 :: Views: 801

rfid lock

hello there, i am designing an rfid lock as my finishing project for college, so i would like you to help me out with your experience. i have read the other posts about rfid locks but i have a desing of my own that needs advice from you.i want my...
Embedded Systems and Real-Time OS :: 26 Aug 2008 8:51 :: pranam77 :: Replies: 1 :: Views: 321

rfid reader ic

hi i am looking for low cost low frequency rfid reader ic.can anyone suggest me the ic thanks...
Microcontrollers :: 17 Aug 2008 16:18 :: xcarriber :: Replies: 56 :: Views: 24603

antenna measurement

hi all,i need help in measuring rfid tag antenna. i am having some tags manufactued locally. how to know its resonance frequency. how can i measure s11. is there any technique by which i can connect tag to network analyzer.any related document will h...
RF, Microwave, Antennas and Optics :: 13 Aug 2008 15:20 :: Abhishekabs :: Replies: 24 :: Views: 1110

13.56mhz pa for rfid reader reference design.

i found an application note from microchip about a 13.56mhz rfid reader reference design. i attached the schematic here. i have some questions:...for the power amplifier, how to design the matching network? how to decide the component value?in this p...
RF, Microwave, Antennas and Optics :: 04 Jul 2008 11:03 :: ADS_RFMW :: Replies: 16 :: Views: 4264

uhf rfid reader antenna for hand held applications

i am developing a reader module antenna 900mhz band (860-930mhz) which should typically have a gain of around 3 db or so. a microstrip patch is larger and may not be suitable for the application. prefer to use pifa and anybody can suggest a better s...
RF, Microwave, Antennas and Optics :: 16 Jun 2008 7:47 :: mission :: Replies: 11 :: Views: 726

13.56mhz rfid pcb antenna testing picture/instruction

tenna with network analyzer.as you know,the celluar antenna can connect the network analyzer test cable with coax cable which welds on the pcb ,but im not sure this method could apply to the 13.56mhz rfid ante......
RF, Microwave, Antennas and Optics :: 18 Feb 2008 3:25 :: zfl :: Replies: 2 :: Views: 399

build loop pcb antenna for em4095 rfid reader

hi,im building rfid reader with em4095 and i want to implement loop pcb antenna. i was wondering if you can give me some guidelines for calculating the copper thickness, track width and width constraint and also number of loops and antenna dimensions...
RF, Microwave, Antennas and Optics :: 27 Jul 2007 11:12 :: mdusan :: Replies: 8 :: Views: 2007

simualtion of inductive coupling between two flat pcb coils

hello,i would like to compute (simulate) the variation of the inductive coupling (or the mutual inductance) between two flat coils printed on a pcb versus the distance. the two coils have a 2.5µh value and the operating frequency is about 13mhz. do y...
Electromagnetic Design and Simulation :: 18 Jun 2007 16:02 :: Joe_User :: Replies: 4 :: Views: 360

long range rfid - 125 khz

hi i looking for project , ideas for long range passive rfid 125 khz - long range = about 100 cm.i want to read word tag unique with manchester encoding.any ideas ?i found some information on internet - i buy oem reader but all time range is too smal...
RF, Microwave, Antennas and Optics :: 03 Jun 2007 6:45 :: Usmanaih :: Replies: 18 :: Views: 2370

practical rfid

dear sir,could anyone please suggest me about making an rfid project in practical. especially with rfid loop ant. example design....
Hobby Circuits and Small Projects Problems :: 10 Apr 2007 11:41 :: nikhil_damle :: Replies: 5 :: Views: 1365

rfid + mcu

:d anyone interested in developing rfid (radio frequency identification) system with microcontroller? 8o...
Microcontrollers :: 26 Mar 2007 14:20 :: qv1985 :: Replies: 14 :: Views: 3756

rfid

i am working on project named rfid using em4095 as part of receiver module. as transpoder i use em4102. i designed coil l = 400 uh.i designed pcb with all pheripheral components (capacitors,resistors as shown in datasheet).i started to measure the rf...
RF, Microwave, Antennas and Optics :: 16 Mar 2007 10:25 :: Kojak :: Replies: 2 :: Views: 279

what is the difference between 13.56 mhz and 125khz rfid tag

hi,what is the difference between 13.56 mhz and 125khz rfid tag?thanks...
RF, Microwave, Antennas and Optics :: 27 Feb 2007 9:30 :: msadek_eng :: Replies: 11 :: Views: 948

rfid reader design

can any one tell me if it is possible to design a reader by ourselves.....
RF, Microwave, Antennas and Optics :: 15 Jan 2007 2:43 :: blapcb :: Replies: 3 :: Views: 549

how to create a strong magnetic field

dear fellows,i am trying to design an antenna for near-field magnetic coupling (uhf rfid). i know that it is easy to design such an antenna in hf. a multi-turn loop works great. however, in uhf, we all know that it is quite different due to the radi...
RF, Microwave, Antennas and Optics :: 28 Aug 2006 2:21 :: bingjiang99 :: Replies: 4 :: Views: 570

how to design loop ant on pcb?

how to design loop ant on pcb?and calculate radiation resistance & inductance ,capacitance of it ?:d...
RF, Microwave, Antennas and Optics :: 12 Mar 2006 22:56 :: ahmad_abdulghany :: Replies: 6 :: Views: 1323

sonet rfid antenna simulation questions

hi guys i am first day user of em simulation so please dont be angree for stupid questions .)well i need to design hf rfid antenna and it was possible to simulate spiral rectangular structure. but netlist got from spice does show different model com...
Electromagnetic Design and Simulation :: 21 Jan 2006 22:57 :: rautio :: Replies: 4 :: Views: 468

rfid model

i have been tired looking for rfid transponder chip in conventional pacgakes (tssop alike) . the only one i have found - microchips. while there is no problem with samples , for orders (giong to be around 10k or little bit more ) they work with large...
Microcontrollers :: 24 Oct 2005 23:04 :: artem :: Replies: 3 :: Views: 654

rfid antenna problem

now i have a antenna problem on rfid antenna; if i want to design 4 antennas printed on a 85*55 mm2 pcb board. two antennas are operated at 915mhz, the other are design at 2.4ghz. how shall i do this design?shall i use loop antenna or pifa ??someone ...
RF, Microwave, Antennas and Optics :: 07 Aug 2005 22:28 :: pir0texnik :: Replies: 1 :: Views: 243

433 mhz rf compact antenna design

hi, alli have 2 rfid device at 433 mhz using quarter wave length antenna. they are handheld devices of credit card size. the communication range is about 1.5 meters.my problem now is to remove the 17.2 cm antenna and make a more compact antenna for t...
RF, Microwave, Antennas and Optics :: 04 Mar 2005 11:47 :: wanchope :: Replies: 0 :: Views: 519

pcb antenna

hi !i need info abaout pcb low power antennas. like those in car alarm systems. i would like to know it its some tool for the simulation of these antennas. thanks...
RF, Microwave, Antennas and Optics :: 22 Jun 2004 10:03 :: jupiter :: Replies: 12 :: Views: 3188

rf problem

hi:i recently take part in a rf project. there are two many problems.1. i want the read distance about 6 meters. the antenna must be in a pcb and low power comsuption. and it will be used in vehicle access(near the metal). if it is possible to rfpic ...
Microcontrollers :: 02 Apr 2004 15:48 :: HeiFelix :: Replies: 4 :: Views: 414

antenna design

hi,i am designing a rfid reader. can somebody help me with the antenna design of radio frequency applications. the reader works on frequency of 135khz and the current ratings of the antenna should be 137ma. please let me know as to how is the antenna...
RF, Microwave, Antennas and Optics :: 01 Apr 2004 18:47 :: HeiFelix :: Replies: 4 :: Views: 612

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