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    <title>Antenna design</title>
    <link>http://rfid-handbook.de/forum/list.php?4</link>
    <description><![CDATA[At this forum you may discuss about the desing of reader- or transponder-antennas at any frequency. This could be calculation of the antenna, simmulation or contacting the chip ...]]></description>
    <language>EN</language>
    <pubDate>Fri, 02 Jul 2010 20:54:53 +0200</pubDate>
    <lastBuildDate>Fri, 02 Jul 2010 20:54:53 +0200</lastBuildDate>
    <category>Antenna design</category>
    <generator>Phorum 5.1.15</generator>
    <ttl>600</ttl>
    <item>
      <title>tuning of 13.56 MHz antenna</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3866,3866#msg-3866</link>
      <author>Leonidas9</author>
      <description><![CDATA[Hi everybody,


 I have some difficulties in understanding a physic fact about RFID antenna.

 I explain myself. It is commonly said that when we will approach an RFID card from the HF antenna, this one will have a different resonance frequency.

So we have to change a capacitance to modify the frequency resonance. Ok.

But if the frequency resonance change that means that one of the (RLC) parameters of the antenna is modified.

Thus I found an explanation in the modelizing of an RFID reader and its tag, with a primary circuit and its secondary circuit and a mutual inductance between them, that will modify the inductance seen from the primary (so the L of my base station antenna).

Anyway, I would like to know if anybody have an idea on how to calculate the new inductance ?

This is in order to have the exact value on how to calculate the serial capacitance to add and make my antenna resonate at 13.56 MHz.


Regards and thank you for reading !]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3866,3866#msg-3866</guid>
      <pubDate>Fri, 02 Jul 2010 20:54:53 +0200</pubDate>
    </item>
    <item>
      <title>Problems in GEONETCAST system design</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3846,3846#msg-3846</link>
      <author>survi_aga</author>
      <description><![CDATA[This is my first post.. I dont know if I am supposed to post it here..
I am an engineering student and am currently interning at IIRS(ISRO), Dehradun.

Here we are planning to establish a set up to download data from the EumetSat or the FengYunCast. In order to establish the setup the main requirements are


1. Dish Antenna – We require a C band dish antenna to receive at a frequency range of 4033.25 – 4042.25 Mhz (a download central frequency of 4037.75 Mhz) for FengYunCast. It would approximately require an antenna of 2.4m (44.5db).
For the Eumetcast we would require a C band antenna of approximately 5.37m (32db).

2. LNB – We would require a LNB of input frequency 3.4 to 4.2 Ghz.

3. DVB PCI Card -- A Digital Video Broadcasting card of frequency Range 950 Mhz to 2150 Mhz and input power level of -65 dBm to -25 dBm. The card should have a symbol rate of 2 Mbps to 45 Mbps.


Could anyone tell me the feasibility of the setup; i.e. whether the setup would actually be able to download data from the AsiaSat 4. Further I also seek your knowledge about the dealers and manufacturers who can provide me with these equipments.

Saurav Agarwala
Geo Informatics Division (GID)
Indian Institute of Remote Sensing
(National Remote Sensing Centre)
4 Kalidas Road
P.B. 135
Dehradun 248001
India]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3846,3846#msg-3846</guid>
      <pubDate>Mon, 07 Jun 2010 13:32:02 +0200</pubDate>
    </item>
    <item>
      <title>Antenne Coil Simulation</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3780,3780#msg-3780</link>
      <author>elzo71</author>
      <description><![CDATA[Hallo
I need Software or Mathlab Code  to make Simulation for Coil Antenne for 134 or 125 KHZ please help ,advise]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3780,3780#msg-3780</guid>
      <pubDate>Mon, 12 Apr 2010 17:16:11 +0200</pubDate>
    </item>
    <item>
      <title>Two pole 13.56 Mhz antenna into 4 pole Mifare Antenna</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3635,3635#msg-3635</link>
      <author>ralu</author>
      <description><![CDATA[I have alredy designed one loop antenna whit 2 capacitors and has 2 inputs to attach antenna. I measured S11 parameters and it works as expected. Now i need to add supprt for extra mifare module which has similar but 4 pin design. In uses to capacitors to split ground and there are two exiter signals. Input is driven trough 5K resistor from exiter signals inputs.

I need one IC that supprts both type of antennas, but i do not have idea what are proper settings. Are S11 parametsr measured from both exiters or from one exiter and GND?

I was thinking of spliiting serial and paralel capatiors from 2 input antenna design, and just add 1 grund and 1 extra output trough resistor. Is this good aproach?


How does mifare module works and how to design resistror for receiver?

 I have digital oscilospe whit 1Ghz range and 200Mhz signal generator and had no problems calibrating 2 input antenna for iClass reader.]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3635,3635#msg-3635</guid>
      <pubDate>Tue, 08 Dec 2009 18:30:34 +0100</pubDate>
    </item>
    <item>
      <title>Re: 13.56MHz antenna</title>
      <link>http://rfid-handbook.de/forum/read.php?4,2878,3614#msg-3614</link>
      <author>dongxl</author>
      <description><![CDATA[Want to exchange ideas.]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,2878,3614#msg-3614</guid>
      <pubDate>Wed, 04 Nov 2009 07:15:49 +0100</pubDate>
    </item>
    <item>
      <title>I need a power amplifier for RFid TRF7960</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3592,3592#msg-3592</link>
      <author>choto13</author>
      <description><![CDATA[I need to know if I can help to design a power amplifier to the antenna design of the TRF7960 which could provide me since I need to increase the range of reading at least 70 cm. thanks!!!]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3592,3592#msg-3592</guid>
      <pubDate>Fri, 16 Oct 2009 22:12:37 +0200</pubDate>
    </item>
    <item>
      <title>Antenna for 125 Khz &amp; 134 Khz</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3483,3483#msg-3483</link>
      <author>elzo71</author>
      <description><![CDATA[Hallo
Can the Reader  für LF 125 KHz read passtive Transponder for 134 KHz? will that works?]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3483,3483#msg-3483</guid>
      <pubDate>Mon, 17 Aug 2009 12:34:21 +0200</pubDate>
    </item>
    <item>
      <title>Re: Matching Network for Mifare Reader Antenna</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3162,3482#msg-3482</link>
      <author>elzo71</author>
      <description><![CDATA[Hallo 
I am facing some Problems like yours can you send to me more Information and Datasheet via Email please: elzo71@yahoo.com
Thanks in Advance

Abubaker]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3162,3482#msg-3482</guid>
      <pubDate>Mon, 17 Aug 2009 10:51:01 +0200</pubDate>
    </item>
    <item>
      <title>Re: Measurement Method for LF/HF Resonance Frequency</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3229,3481#msg-3481</link>
      <author>elzo71</author>
      <description><![CDATA[Hallo 
You have to check which input Impedance for your Analyser ,for designing the Coil use the Pricipels Equation for Transformers.

Abubaker]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3229,3481#msg-3481</guid>
      <pubDate>Mon, 17 Aug 2009 10:34:31 +0200</pubDate>
    </item>
    <item>
      <title>Re: RFID- Antenna design 1m x 1m</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3335,3480#msg-3480</link>
      <author>elzo71</author>
      <description><![CDATA[Hallo
I have this Problem too in LF and I guess you sould calculate or measure the E-Feld and M-Feld,how much Watt feeded to the Antenna?]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3335,3480#msg-3480</guid>
      <pubDate>Mon, 17 Aug 2009 10:15:00 +0200</pubDate>
    </item>
    <item>
      <title>Re: tunnel shaped antenna</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3375,3477#msg-3477</link>
      <author>jayabaya</author>
      <description><![CDATA[You don't specify the operating frequency you are using. For HF application, small tunnel antenna would do that. Assuming you move your hand into the tunnel.]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3375,3477#msg-3477</guid>
      <pubDate>Sat, 08 Aug 2009 02:09:28 +0200</pubDate>
    </item>
    <item>
      <title>patch antenna radiation pattern</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3463,3463#msg-3463</link>
      <author>pkat</author>
      <description><![CDATA[As pointed out in the book Antenna Theory &amp; Design by Stutzmand &amp; Thiele that the radiation is maximum in +z direction (theta=0), perpendicular to patch surface (lying in x-y plane) in a patch antenna. 

My dilemma: The reason I fail to see the radiation coming out perpendicular (top of patch) to the patch (+z direction) is because of the ground under it. Based on image theory the effective E-field will be confined to space between the patch and the ground and be zero elsewhere at all the times. Thus only the fringing field (which decouples when charge is cancelled) at the ends/slots is responsible for the field pattern. 
 
If the gnd underneath patch didn't exist then I do see how the max radiation would be perpendicular to the middle of the patch on both sides of the patch as in a dipole.

Any suggestions? Thank you in advance]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3463,3463#msg-3463</guid>
      <pubDate>Tue, 14 Jul 2009 01:48:42 +0200</pubDate>
    </item>
    <item>
      <title>Re: L-Probe Antenna CST simulation problem</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3450,3456#msg-3456</link>
      <author>winson</author>
      <description><![CDATA[Finally obtain the results same as the actual results by using CST 2006, still not sure why i can't get the correct results in 2009 version may be the new version's setting is a bit different. Regarding the boundary condition, with all boundary set to &quot;open (add space)&quot; and &quot;et = 0&quot; for ground plane i was able to get the correct results in CST 2006, so i think this setting might correct as well. I think the open (add space) will simply means that it is infinite boundary beside to all dimensions of the antenna so that all EM wave will propagate out without any reflection back to the antenna.]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3450,3456#msg-3456</guid>
      <pubDate>Sat, 04 Jul 2009 17:56:10 +0200</pubDate>
    </item>
    <item>
      <title>different Antennas Form for 125 Khz</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3455,3455#msg-3455</link>
      <author>elzo71</author>
      <description><![CDATA[Hallo
I am working on a Project to test different external Antenna Forms for RFID Reader 125 KHz ,can anyone help me how to calculate the Inductance of a rectangular Form Antenna and other Form also,Documents and Programmy would be apprciated

best Regards

Abu]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3455,3455#msg-3455</guid>
      <pubDate>Tue, 30 Jun 2009 10:46:52 +0200</pubDate>
    </item>
    <item>
      <title>L-Probe Antenna CST simulation problem</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3450,3450#msg-3450</link>
      <author>winson</author>
      <description><![CDATA[Hi everybody,

I'm new to CST microwave studio. Just finish constructed a structure of an L-probe patch antenna (from IEEE paper) and just run the simulation by transient time solver, the curve of the return loss(S11) against frequency that i get is different from what showing on the IEEE paper, so is it the boundary condition setting will affect the simulation results? And actually what is the function of setting the boundary condition?

During the simulation, a warning message &quot;some PEC material is touching the boundary&quot; was show. After change the boundary condition setting to &quot;open(add space)&quot; then the warning will eliminate when run again the simulation. But the s11 curve still different from the &quot;actual&quot; results.

Anybody can help?
Any comments will be appreciate.

Thanks.]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3450,3450#msg-3450</guid>
      <pubDate>Tue, 16 Jun 2009 23:11:48 +0200</pubDate>
    </item>
    <item>
      <title>Re: tag frequency impact on radio-frequency</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3400,3430#msg-3430</link>
      <author>Jtorres</author>
      <description><![CDATA[Andre,
   The frequencies you listed will cause no conflict with each other.]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3400,3430#msg-3430</guid>
      <pubDate>Wed, 27 May 2009 14:52:02 +0200</pubDate>
    </item>
    <item>
      <title>Re: Matching Network for Mifare Reader Antenna</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3162,3423#msg-3423</link>
      <author>george</author>
      <description><![CDATA[Sorry, I sent you a MP.]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3162,3423#msg-3423</guid>
      <pubDate>Thu, 21 May 2009 23:18:28 +0200</pubDate>
    </item>
    <item>
      <title>125 kHz antenna inductance?</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3415,3415#msg-3415</link>
      <author>newell</author>
      <description><![CDATA[I'm working on an EM4095 LF (125kHz) reader design.  I'm a bit confused as to the target inducatance of my antenna coil.  The EM4095 docs imply that most coils are designed to fall in the 300-800 uH range.  I've measured the etched PCB antenna on the EDB4095 at about 145 uH.  I had a Tectus kit with a wound coil that came in about 200 uH.  There's another EM Micro demo kit that describes a 715 uH coil.  Finally, a company in Australia sells a couple of wound coils (for use with EM4095 designs) that are described as 2.8 mH.

So, does the inducatance really matter?  Or should I just pick a value and design the coil to fit my available space (40 mm diameter) and desired Q?

thanks!]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3415,3415#msg-3415</guid>
      <pubDate>Tue, 12 May 2009 19:23:29 +0200</pubDate>
    </item>
    <item>
      <title>tag frequency impact on radio-frequency</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3400,3400#msg-3400</link>
      <author>André</author>
      <description><![CDATA[Dear sir/madam,

I don't know much about frequencies, so could anybody tell me what the impact is of a RFID-tag on radio-headphone (for use in noisy work circumstances).

Because the usable RFID frequencies are  125KHz, 13.56MHz, 860 to 950 MHz, and 2.45GHz. The Dutch FM radio's use frequencies from 86 MHz to 108 MHz, the AM radio's: 540 kHz to 1611 kHz.

I hope hearing from you soon.

Kind regards,

André]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3400,3400#msg-3400</guid>
      <pubDate>Thu, 23 Apr 2009 08:30:06 +0200</pubDate>
    </item>
    <item>
      <title>matching vs. efficiency of the rectifier</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3085,3392#msg-3392</link>
      <author>Stefano82</author>
      <description><![CDATA[Hi,

Theoretically, if an antenna is perfectly matched with the load (for example the rectifier), the amplitude of the voltage on the load will be the antenna amplitude over two! And this result is indipendent by the current absorbed by the load. So, in condition of matching the efficiency of the rectifier has not influence on the maximum operative range of the tag.

Is it correct?
Why does people try to maximize the efficiency of the rectifier and not to minimize its input voltage need to work?
The two approach are different because of the input impedence.

Thanks a lot...
Stefano]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3085,3392#msg-3392</guid>
      <pubDate>Tue, 31 Mar 2009 14:31:25 +0200</pubDate>
    </item>
    <item>
      <title>Re: antenna design</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3001,3376#msg-3376</link>
      <author>angelray</author>
      <description><![CDATA[Hi,
we can design GSM, CDMA,3G, WIFI, DVB-T, GPS, UWB, WIMAX and RFID antennas according to the demand,and provide test service,we can discuss together if any problem]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3001,3376#msg-3376</guid>
      <pubDate>Wed, 18 Mar 2009 06:15:38 +0100</pubDate>
    </item>
    <item>
      <title>tunnel shaped antenna</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3375,3375#msg-3375</link>
      <author>pieter</author>
      <description><![CDATA[Hello,

I am looking for help on designing an antenna that can read/write tags placed on various positions on the wrist. I am thinking of a u shaped device in which the wrist can be placed, but do not know if it is possible to shape one antenna this way or that multiple antennas will be needed. Do you have experience designing a solution to read tags from multiple directions? Then Please help

Section cut:

Antenna )))      WRIST       ((( Antenna
______________O

______________^
______________^
______________^              
___________Antenna

Tag Specs:
13,56 ISO 15693 tags 14x35 mm]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3375,3375#msg-3375</guid>
      <pubDate>Mon, 16 Mar 2009 16:56:39 +0100</pubDate>
    </item>
    <item>
      <title>UHF RFID Antenna for integration</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3365,3365#msg-3365</link>
      <author>jancambodia</author>
      <description><![CDATA[Hi

I'm looking for circular and linearly polarized UHF RFID antennas for integration into a handheld reader. Requirements:

- Freqeuncy Range: UHF RFID, Europe
- Small form factor
- ETSI 302-208 compliant

I anyone know where I can get this kind of antenna, plz let me know.

Regards

Jan]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3365,3365#msg-3365</guid>
      <pubDate>Fri, 13 Mar 2009 16:24:10 +0100</pubDate>
    </item>
    <item>
      <title>RFID- Antenna design 1m x 1m</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3335,3335#msg-3335</link>
      <author>sachingomare</author>
      <description><![CDATA[Dear friends,

I have already designed an antenna of 1m x 1m. I built a power amplifier to drive antenna at output of TRF7960. Presently with small antenna i am getting all tag detection and all functionalities. But with this large antenna i am not getting the tag response, i tested the antenna is tunned properly. It is emitting the 13.56 rf field. Plz can anybody suggest me.]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3335,3335#msg-3335</guid>
      <pubDate>Mon, 23 Feb 2009 15:58:05 +0100</pubDate>
    </item>
    <item>
      <title>Re: Interest of a stacked dual layer spiral antenna ?</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3293,3309#msg-3309</link>
      <author>Velux</author>
      <description><![CDATA[47 readers, no answer...
So
1) my question is unuseful ?
2) nobody understand my problem ? 
3) nobody got any answer to my problem ?
4) nodody want to answer ?
5) many people have RFID problems, do not have any answer, start to worry about it, and then discover it's all the problem of this website: a lot of question, homeopatic answers?

I'm quite a big fan of sharing knowledge... might not be everybody's choice...
No problem, I'll face this problem easily :)]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3293,3309#msg-3309</guid>
      <pubDate>Mon, 02 Feb 2009 16:53:11 +0100</pubDate>
    </item>
    <item>
      <title>Re: Interest of a stacked dual layer spiral antenna ?</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3293,3308#msg-3308</link>
      <author>Velux</author>
      <description><![CDATA[47 readers, no answer...
So
1) my question is unuseful ?
2) nobody understand my problem ? 
3) nobody got any answer to my problem ?
4) nodody want to answer ?
5) many people have RFID problems, do not have any answer, start to worry about it, and then discover it's all the problem of this website: a lot of question, homeopatic answers?

I'm quite a big fan of sharing knowledge... might not be everybody's choice...
No problem, I'll face this problem easily :)]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3293,3308#msg-3308</guid>
      <pubDate>Mon, 02 Feb 2009 16:46:25 +0100</pubDate>
    </item>
    <item>
      <title>Re: ansoft designer</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3254,3294#msg-3294</link>
      <author>Velux</author>
      <description><![CDATA[I'm sure nobody will give you for free a commercial product.
Try this :

http://www.ansoft.com/ansoftdesignersv/]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3254,3294#msg-3294</guid>
      <pubDate>Mon, 19 Jan 2009 15:07:29 +0100</pubDate>
    </item>
    <item>
      <title>Interest of a stacked dual layer spiral antenna ?</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3293,3293#msg-3293</link>
      <author>Velux</author>
      <description><![CDATA[Hello all,

I just asked myself about this: on RFID 13,56 MHZ, if I stack spiral antenna on each side of a PCB and feed the differential, what will be the consequences on the flux and the range of the coil ?
I understand there might have coupling effects, what will decrease the inductive value and the self resonant frequency, but I'd really like the point of view of experts.

Thanks for your future help !
Regards]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3293,3293#msg-3293</guid>
      <pubDate>Mon, 19 Jan 2009 14:47:52 +0100</pubDate>
    </item>
    <item>
      <title>Re: Newbie question : shape and size of RFID antennas</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3274,3279#msg-3279</link>
      <author>Velux</author>
      <description><![CDATA[... I hoped, somebody could give me a hand :(
Please !]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3274,3279#msg-3279</guid>
      <pubDate>Wed, 14 Jan 2009 14:45:02 +0100</pubDate>
    </item>
    <item>
      <title>Re: Need Help in designing antenna for 134.2 KHz (TI, RFM 007B module)</title>
      <link>http://rfid-handbook.de/forum/read.php?4,3251,3278#msg-3278</link>
      <author>warrenleach</author>
      <description><![CDATA[The RFM007B has resonance tuning capacitors on the RF board and the antenna is supposed to be close to the reader.  You should use the RFM008B with remote capacitors which can drive antennas 100 meters from the reader.

The 007 has a limited tuning range of 27 to 27.5 uH which makes designing an antenna harder.  The 008 has an inductance range of 8 to 80 uH so a wide range of antennas will work.

Hope that helps,

Warren
Oregon RFID]]></description>
      <category>Antenna design</category>
      <guid isPermaLink="true">http://rfid-handbook.de/forum/read.php?4,3251,3278#msg-3278</guid>
      <pubDate>Wed, 14 Jan 2009 04:36:36 +0100</pubDate>
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