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Rfid Coil Design

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37 Threads found on Rfid Coil Design
yes, momentum is the good tool for rfid Circuit & Antenna design & simulations
Need reference books for rfid Antenna design. is any book available in this forum regarding rfid Antenna design? Advance Thanks.
haii ..i want to design rfid near field rectangular array antenna...plz suggest me how to design the antenna..basic requirements.. and which software is suitable for this....plz suggest me because i dont have more knowledge in this.. i want to do this as my thesis work.
Hi, guys. i am doing rfid coil design currently,but doubt how to verify coil without tag it possible to tune coil to 50ohms and add one differential 50ohms load to estimate the chip's impedance, then measure voltage between two end of load? if it works, how to design differential 50ohms it (...)
Hi Logan, I am not very expert in rfid. But I think it all depends to the frequency of operation. For example in 13.56MHz systems, the tag should be in the near field of the reader. So the principle of power transfer is based on inductive coupling. Thus it is better to say the coil tag is an inductor. In the other hand, for very high frequen
What frequency? You can find equations for coil design for 125kHz & 13.56MHz on the Microchip website: For details on rfid principles, check "rfid handbook" - Klaus Finkenzeller: and "Smartcard handbook" - oriented more on software
For rfid antenna radiation patterns and efficiencies, you can use EM-Core to simulate them. Infor for download and rfid antenna design can be found at
When designing a rfid coupler coil, you have to take into consideration the intended operation distance and the nominal field strength range of the respective rfid standard. (You didn't mention any). The Microchip design guide has a good chapter about coil design and (...)
hi, i am designing the rfid module i e13.56 MHz rfid from Microchip , i got the ckt from same and designed the ckt , the problem is designing the tag , can any one tell me is there any ready made tag is available for this rfid module (tag type is MCRF 355/360)?......... (...)
1) If you insist on using LF rfid system There has been LF rfid systems delivering a maximum read range about 1 m on the market. However, to achieve this read range really pushes all components to their extremes. Therefore, it is not an easy task. 2) If you turn to UHF rfid system All requirements u mentioned can be realized by UHF (...)
yes, I mean 13.56MHz. How is the difference between rfid and contactless technology?
It will be very difficult to construct the antenna on pcb at this freq. The antenna should be part of resonant circuit tuned at 125khz. BTW, for rfid, as far as I know, freq. is 125khz, not 135. The antenna should have the approximate area of a credit card, and the number of turns should be around 30. Wire diameter : 0.3-0.5mm. As I said before, th
Hello everybody I'm trying to design a Handheld rfid reader on the 125KHz using the U2270B from Atmel. I looked through the schematics provided by Atmel and they recommend an antenna coil with and inductance of 1.35-1.5mH, which seems a bit large for me. I did a search in this website and the topic had came up in the past, but I can't (...)
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 compared to reference design from Sonet .
I am trying to solve the same problem. You can get the bandwidth by making a coil and deQ the coil with a resistor. Lamda of rfid UHF is 33cm (13inches). That means it is very difficult to make a large magnetic antenna. Maybe an array of small antennas?
Hi, What is the formula for calculating the transmitted power by a coil inductor? For example in 13.56MHz rfid systems, what is the formula for calculating the power transmitted by the antenna of the Reader. I think the transmitted power by a coil inductor is the same as the reactive power generated by the coil which (...)
Datasheet is here: You can send questions to the manufacturer via this email
RE: Possible bug in Microchip AN710 ?Antenna design for rfid Applications? (?) Collegues, please take a look: ?Inductance of various antenna coils? chapter (page 9). Eq. 26 gives the inductance of a square coil. Eq. 27 gives the inductance of a rectangular coil.
some rfid according to iso18000 operates even lower .. in 125khz, they are using coil antenna but with very small range.
hi! i have designed and fabricated a uhf microstrip antenna for rfid tag for my undergraduate fyp. i need ideas to expand it for my master degree thesis. thank u
hey friend... i m sudhanshu...workin on rfid library for my final project... will u plz help me out by providin the necessary diagrams and information you have... waiting.. my email id :-
Hello, Is it possible for rfid tags to have an excitation coil to supply the required voltage to the rfid transponder and then use other rfid readers to get the data from the rfid transponder ? how is this done in term of design and in term of frequencies ? Thank you
Usually, loop antenna is a good way to realize near coupling. You can search some rfid antennas as examples. It can be realized by multilayer PCB, Flex Printed Circuit, or just wrap a wire to form a coil.
You don't provide much information at all. - involved rfid standard? - utilized reader chip? - did you measure the field strength at the card's location with a test coil? (A test coil is basically an oscilloscope probe with a wire loop of known area) - did you see any load modulation (card response) with the test coil?
Google for rfid circuits running at 125kHz
1) I suggested FastHenry, any of those high end EM simulators could also do, of course. As I previously mentioned, I can hardly imagine to put the circuit in operation without measuring instruments. The usual rfid reader circuits are high Q and most likely need fine tuning. 2) It's a RLC network, standard network theory applies. If you aren'
Dear all, I am designing an rfid system at 13.56MHz.I am finding problems in generating the current required for the effective reception of the signals.The currrent needed is atleast 150mA.The feed circuit is attached.Please,help me with this.
We used 4051 analog multiplexors to design 40 inputs rfid and all they work well. Single U2270B chip is connected through 5 analog multiplexors 4051 to 40 different coils. We used ferrite inductors 5x10 750uH which could be obtained in any electronic shop. The detect distance was around 30mm. I'm talking about working solution, so 4051 (...)
A important design part is to tune the antenna impedance so it effectively can transfer energy from antenna to receiver and rectifier. For that must your receiver/rectifier impedance be known. Proposals how to tune and impedance match similar coil antennas can be found at a lot of HAM-sites or ARRL. It is possible to simulate the antenna but antenn
Hi all, im trying to design a rfid 125kHz system that only recognises one passive tag, with an output to show the tag is recognised. Could someone suggest or point me in the direction of the minimum numbers of components i would need to create this application? im hoping to an as small as possible PCB with separate antenna. Thanks in advance
I'm under the impression, that the pulse CX2041NL may be better suited for 10 MHz range than mini-circuits TCM1-1 due to it's wider frequency range. But basically each of them should work, if you apply standard open/short/load calibration at the transformer secondary. A general problem with balanced network analysis is the unknown common mode to di
Hi Folks, What is the difference between Chip Inlay and Label? To my knowledge, Chip is mounted on the plastic substrate. How will we differentiate the terms Inlay, Label and Substrate? I am working on rfid and I often come across the terms like rfid Tag, Label and Inlay. rfid Tag has IC + Antenna. But I don't understand the (...)
Hello, I have a problem with design antenna to rfid tag used in ID-1 card. I design a rectangular coil for Mifare Classic. I need a information where i can find a resistance of Mifare chip? I took to my calculation a Resistance a chip: 300 ohm, but i dont know if this is a true value. This is a calue that I received (...)
I have designed a rfid tag antenna 13.56 MHz (hexagonal spiral antenna) but the problem is it's not resonating. How can i make it to resonate? Need Help Urgently.
hello there! i've been working in an rfid reader whose read range or the effective distance of the rfid tag is from the reader is only 3cm and i need it to have a read range of 14 inches. does anyone know how i can achieve this and how to design a power amplifier in bidirectional mode and is operating at 13.56MHz. I really need and woul (...)
Program (i did not use so please share experience about accuracy) And microchip AN for rfid :
Hi, I trying to design a rfid antenna for 13,56Mhz in CST Microwave Studio. I designed several antenas as a ( ) but I'm not sure if generated result(S-Parametr,Smith Chart,Polar Plot,Farfields an other) from CST Studio is correct. I'm not sure if I goot set ports,fie