975 Threads found on edaboard.com: Antenna Circuit
How to design a smart antenna circuit by use of CC2400?
what kind of program do i need to write ?
RF, Microwave, Antennas and Optics :: 18.01.2007 00:35 :: loooo1983 :: Replies: 0 :: Views: 363
antenna circuit Design for RFID Applications-MicroCHIP
RF, Microwave, Antennas and Optics :: 05.02.2007 15:59 :: nacht :: Replies: 1 :: Views: 1314
Hello guys, I would like to build a directional antenna and system to find the something, like the one used in wild life to trak down endengered species. Any suggestion/help link and why not circuit/schematica is highly appreciated. Thankx :D
RF, Microwave, Antennas and Optics :: 01.02.2003 19:58 :: wafer101 :: Replies: 1 :: Views: 529
Check out microchip application note title is "antenna circuit Design for RFID applications"
Hope this will help you start somewhere :)
Hobby Circuits and Small Projects Problems :: 15.04.2004 01:47 :: lguancho :: Replies: 5 :: Views: 2328
I can build antenna yagi and posting here about the geometry.
How much the frequency ?
RF, Microwave, Antennas and Optics :: 14.12.2004 22:35 :: bsiswoyo :: Replies: 1 :: Views: 892
simply , simuate the patch antenna using momentum , and use the S paramter file , and use it in the circuit simulation
it should work ok
RF, Microwave, Antennas and Optics :: 23.02.2007 06:50 :: khouly :: Replies: 1 :: Views: 644
to build the whole circuit, you need.
1. VCo circuit
4.matching and antenna circuit..
normally you can find the circuit separately, then you combine those circuit...
try to simulate the cir
RF, Microwave, Antennas and Optics :: 12.09.2009 16:04 :: linaweku :: Replies: 5 :: Views: 5540
dear i am using wimax but its signal is very low plz give me low cast antenna for wimax use in outdoor
i am thank full 2u
Digital communication :: 01.08.2010 01:57 :: kashif_ramzan :: Replies: 0 :: Views: 422
I have a requirement to read data from tags in a grid of squares 2 1/4" x 2 1/4" The grid can be 4x6, 4x8, 6x6, etc. The reading distance needs to be about 1.5" in diameter extending about 1/4" from the antenna. The tags will be separated from the antenna by a sheet of glass (or other non-conducting element). Is it possible to simply wire up an ant
RF, Microwave, Antennas and Optics :: 05.03.2012 14:44 :: klogic :: Replies: 0 :: Views: 444
That’s an active antenna circuit used for receiving purposes in instances where a normal antenna would be impossible to accommodate in a physical sense. Such an antenna is sometimes called an antenna booster. For that purpose we are using a field effect transistor as the amplifying device. The JFET (...)
Electronic Elementary Questions :: 19.05.2012 03:07 :: mister_rf :: Replies: 2 :: Views: 261
I'm not using CST for 13.56 MHz RFID coils analysis, some general comments nevertheless.
13.56 RFID is essentially a near field problem. The radiation impedance part of the coil's real impedance can be usually neglected, the far field is mainly interesting as an unwanted EMI.
The coil or "antenna" impedance can be derived by an AC magnetics a
Electromagnetic Design and Simulation :: 14.06.2012 15:43 :: FvM :: Replies: 6 :: Views: 640
To measure antenna polarization you can use a half-wave dipole or a waveguide horn. Their typical polarization separation is >30 dB if made geometrically "clan". Depends on frequency what you may prefer.
At microwave bands I used dipoles made of a thin metal sheet, to achieve >30 dB polarization ratio.
Locate this test antenna far enough from the
RF, Microwave, Antennas and Optics :: 24.05.2013 03:47 :: jiripolivka :: Replies: 1 :: Views: 166
I am working in Bluetooth development is a short range RF communication working in ISM unlicenced band of 2.4 GHz.I need a help for design an Rf antenna for bluetooth inthi please send your suggections inrhi forum
RF, Microwave, Antennas and Optics :: 28.04.2002 11:40 :: Visitbcg :: Replies: 4 :: Views: 2683
If you do not want to go through the bother of making physical filter and combiner networks with exact dimensional requirements, you can put amplifiers in the signal path from each antenna and then accept the small losses from combining networks. You can then combine them with less perfect methods, such as resistor splitters (6 dB loss per stage w
Professional Hardware and Electronics Design :: 18.01.2003 17:17 :: flatulent :: Replies: 3 :: Views: 2015
Could someone please provide a circuit diagram or a link which advises how the signal levels are measured from a TV antenna.
Basically I need to point the antenna in the right direction to get the best signals in 3 different channels (VHF and UHF - 2 separate aerials).
It can be a meter which reads the signal level for a particular (...)
Professional Hardware and Electronics Design :: 03.07.2002 02:27 :: gunmasterg9y2k :: Replies: 4 :: Views: 1206
hello, I would like to implement an antenna in Psp*ce. Someone has an idea. :lol: thanks
Professional Hardware and Electronics Design :: 23.07.2002 18:53 :: powerm :: Replies: 4 :: Views: 681
I don't have clear a question, ultrasonics like you said are in the range of 44KHz, so a 5MHz signal it's not this kind.
If you want to receive 5MHz signals first you need to use a transductor for this signals. So you will need an antenna, you can make a dipole yourself, it's easy. then you would need to use resonant circuit to get 5MHz signals
Other Design :: 28.07.2002 04:39 :: algilsan :: Replies: 5 :: Views: 4757
I want to make UHF & FM antenna booster. Both will be seperate circuits. Please guide me where can i get good schematics\circuits.
RF, Microwave, Antennas and Optics :: 26.12.2002 12:21 :: palesha :: Replies: 14 :: Views: 34643
You can buy ready made RF transmitter and receiver modules from digikey and other sources. The cheapest way is to not use coding. Just use carrier detection. The door bell switch is in series with the battery to the transmitter. The receiver output triggers a power mosfet in series with the buzzer. (That is if the buzzer is operating from DC.)
RF, Microwave, Antennas and Optics :: 04.01.2003 21:34 :: flatulent :: Replies: 9 :: Views: 7901
I need a schematics for a uhf tv booster.
or any good uhf antenna design
Thanks for any help
Hobby Circuits and Small Projects Problems :: 03.02.2003 21:31 :: SphinX :: Replies: 2 :: Views: 7142
I recommend you to look into
Garg,Bhartia,Bahl,Ittipiboon:MS antenna design handbook.
(uploaded by Basskiler too)
On pp. 144-148 are Greens functions you required.
Next you need equations on pp. 93+
It's quite easy to code, I think it's enough for you..
Time ago I've coded similar program - I have problems with determinig radiation Q,
Electromagnetic Design and Simulation :: 07.04.2003 02:42 :: eirp :: Replies: 8 :: Views: 3751
its helicopter controlled by RF antenna ..
i need information and books too on this topic
RF, Microwave, Antennas and Optics :: 22.02.2005 05:09 :: Compy :: Replies: 2 :: Views: 1292
I think there also have a real part in yr antenna.
And then just choose the LC value to make the image part equal to zero.
But the most easiest way is simulated it in MWO.
RF, Microwave, Antennas and Optics :: 24.10.2003 13:13 :: ppAntenna :: Replies: 11 :: Views: 2722
I have a project and i will like to approach it differently .
It turns out that that i have already designed this device that goes in a car hooks up to the cigar lighter mesures something . Now ,i will like to RECEIVE that information in a very unintrusive way . i will like to USE the BODY of the CAR as a RECEIVING antenna . the signal t
RF, Microwave, Antennas and Optics :: 25.10.2003 12:47 :: eltonjohn :: Replies: 9 :: Views: 3299
The sugestion is easy to say and dificult to follow (in some cases).
You must use correct impedance (typicaly 50 ohm), no 90 degree corners, enought distante to minimize coupling, good substrate (depends on aplication),....
But I can't remenber now any book. If you tell us more about your problem, LNA amplifier, power amplifier, antenna, pl
RF, Microwave, Antennas and Optics :: 04.01.2004 10:49 :: tapa :: Replies: 19 :: Views: 3143
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 : (...)
RF, Microwave, Antennas and Optics :: 22.03.2004 08:29 :: pisoiu :: Replies: 4 :: Views: 2832
Are you trying to match the antenna's input impedance to 50 ohms? Via a piece of microstrip conductor? And you would like to know it's width?
As it seems you're using Ansoft Designer, it would be easy to do this using this program.
Zip and upload your design files here so we can take a close look (to see what substrate you're using, etc).
RF, Microwave, Antennas and Optics :: 26.03.2004 09:50 :: VSWR :: Replies: 19 :: Views: 1663
Is it for Industrial production or hobbistic / didactic purpose?
I suggest you 2 solution for hobbistic/didactic purpose:
1) Use Silver Paint varnish (avaible on RS catalog) and carefully draw the conductive circuit. The cable may be machanically secured by stronger glue (2 component resin).
2) Use the Copper Adhesive Tape (available on RS cat
RF, Microwave, Antennas and Optics :: 10.04.2004 08:03 :: sergio mariotti :: Replies: 1 :: Views: 855
I've designed a wideband microstrip p atch antenna (~50 % !!!),using the cst Microwave.
However ,it has a poor performance according to the |S(2,1)|dB plot.
This is due to the coupling between the two order to solve this problem ,I've tried to enlarge the distance between the ports,but then the |S(1,1)|dB was decreased sharply
Electromagnetic Design and Simulation :: 17.04.2004 10:06 :: sas11 :: Replies: 2 :: Views: 925
I am also put the topic "antenna forum" Posted: 13 Jan 2003 19:08
in this forum. and nothing came out from it.
RF, Microwave, Antennas and Optics :: 04.05.2004 19:10 :: plasma :: Replies: 21 :: Views: 1733
Anyone CST Guru here?
I'm trying to simulate a chip antenna (constructed by meandering microstrip monopole on the FR4 base) located at the corner of circuit board (groudplane is removed just beneath the chip). However MWS tells me that calculation does not stay stable. Any good advices?
At the beginning I chose "planar an
Electromagnetic Design and Simulation :: 02.06.2004 04:45 :: eirp :: Replies: 3 :: Views: 1832
feed point of 200 seem high for a 2.4Ghz applications. It is not clear to me how you can measure the antenna without a feed? Maybe you will like to elaborate on your measurement method. May need some error correction on the network analyser if you take the feed out.
I was measuring at the feed point on
RF, Microwave, Antennas and Optics :: 17.06.2004 18:44 :: Element7k :: Replies: 5 :: Views: 906
Practical solution about UHF transmitter
hi there, It's my transmitter illustrated in attached jpg file.
I have some doubts in antenna matching. it's appreciated that anyone can help me.
1. I have no network analyzer in hands for the moment.
2. the freq. of transmitter is 863-864Mhz (wireless phone for Europe market)
so we choose the che
RF, Microwave, Antennas and Optics :: 18.06.2004 02:44 :: surfing :: Replies: 2 :: Views: 1481
You may need to specify what kind of antennas you use?
RF, Microwave, Antennas and Optics :: 21.06.2004 19:56 :: boy :: Replies: 5 :: Views: 2252
I have done some experiments trying to implement RFID in range 125 Khz.
I will tell you:
- with an antenna Accura GP20 10cm diameter aprox. I read tags type glass 13mm in the distance of 10 cm.
- with an handheld device MINEC 4x I read and write tags (glass type 13mm or disk 50mm) only if I touch the tags with the device (0 distance of reading
RF, Microwave, Antennas and Optics :: 23.07.2004 15:25 :: swilly :: Replies: 7 :: Views: 2236
If you are going to receive high power signals it is acceptable to use a low efficiency antenna such as one much smaller than a wavelength inside a plastic housing.
If the housing is metal you can use a slot antenna.
Experimentally determine your case by wiring up a prototype on a board and try different lengths of wire for the (...)
RF, Microwave, Antennas and Optics :: 02.07.2004 18:24 :: flatulent :: Replies: 3 :: Views: 1835
This is a loop antenna only suitable for receiving because of the low radiation resistance and its closeness to the earth. It is nothing unusual. people who do not have old books will reinvent the wheel. This is not any reflection on their imagination. They had the same inventive skill as the first person to invent it.
In general there is
RF, Microwave, Antennas and Optics :: 16.08.2004 20:22 :: flatulent :: Replies: 3 :: Views: 1572
1. Minimize the noise source.
Often this source operates as antenna.
Digital high current outputs spread the noise very well.
Therefore minimize the current in such outputs.
Freese the warm noise source, or minimize its resistance .
2. Make the signal immune to noise.
Such signal can be transferred through high current, low impedance wire.
Analog Circuit Design :: 26.08.2004 03:15 :: Aser :: Replies: 8 :: Views: 1488
Coul'd you give more details as working freq. Kind of antenna etc.
And wath are your target: perhaps the VSWR? or the difference between simulated and observed?
RF, Microwave, Antennas and Optics :: 30.08.2004 17:10 :: sergio mariotti :: Replies: 5 :: Views: 622
The TV dish or something else? TV Dish is an antenna.
Hobby Circuits and Small Projects Problems :: 29.09.2004 05:38 :: djalli :: Replies: 4 :: Views: 7944
Without the ground plane you have something more like an antenna. You would have to use a three dimensional simulator like HFSS to find out what happens. circuit simulators will not do a good job.
Electronic Elementary Questions :: 05.10.2004 23:44 :: flatulent :: Replies: 1 :: Views: 924
if anybody has ever dealt with Reflect-Array antennas plz let me know its major benefit over the other kinds of array antennas.
RF, Microwave, Antennas and Optics :: 22.10.2004 04:25 :: kheir :: Replies: 1 :: Views: 1022
In the AM and short wave broadcast bands the signal strengths are so large that what little gets through to the receiver is adequate. You can try an experiment by putting your finger on the hot terminal of the antenna connector and tuning around to see what you can receive.
You can do some paper analysis. Draw the receiver equivalent input imp
RF, Microwave, Antennas and Optics :: 26.10.2004 22:40 :: flatulent :: Replies: 1 :: Views: 701
Another way is to design the antenna such that it has the required input impedance. This way you won't need matching network, which introduces losses and reduces noise figure.
RF, Microwave, Antennas and Optics :: 30.10.2004 06:39 :: radiohead :: Replies: 3 :: Views: 1035
Depend what is your link-budget (distance between TX and RX).
In 11m band you need big antennas only if you are looking for long distance communications.
As you see, all the R/C radios on the market use less than ? m antennas for this band.
You have to check first of all if your TX and your RX are working properly. Check the conducted output pow
RF, Microwave, Antennas and Optics :: 05.11.2004 02:39 :: vfone :: Replies: 16 :: Views: 9317
I think somewhere is a misunderstanding.
Probably the SWR-meter with one input what you said, is actually a basic RF power meter with internal load.
You need a standard antenna SWR-meter, with one input (for transmitter) and one output (where you connect the antenna).
RF, Microwave, Antennas and Optics :: 25.11.2004 04:37 :: vfone :: Replies: 2 :: Views: 1125
Basically you need a short circuit at the end of the transmission line to get the proper termination. How do you get this ? By using a open circuited transmission line of quarter wave length. You set β=2Π/λ and Ls= λ/4 in the formula you have given and you get the stub impedance referred at the center
RF, Microwave, Antennas and Optics :: 26.11.2004 11:58 :: svarun :: Replies: 1 :: Views: 962
I'm trying to build a match network from an antenna to a switch whose impedance is 50Ohm. To realize that, I first got the return loss values of the antenna in the whole frequency band, namely from 800M to 900MHz. Then I import the data into a port in ANSOFT designer. Then, I choose the center frequency of the span to make a match by the Smith Ch
RF, Microwave, Antennas and Optics :: 01.12.2004 01:14 :: ssstar :: Replies: 1 :: Views: 558
what about to use PML instead of radation BC.
Pml are less sensitive to the angle of incidence and allow you to calculate
Hope this help
Electromagnetic Design and Simulation :: 22.12.2004 08:14 :: rugbyfun :: Replies: 5 :: Views: 2159
It's all about RFID technology from Microchip.
- RFID Basic
- Device datasheet
- antenna circuit design
- Reference reader design (included circuit)
Microcontrollers :: 18.01.2007 21:21 :: elektrom :: Replies: 6 :: Views: 1868