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gsm rx out-band attenuation issue
hi guys,my pcb is using qualcomm 8k platform with rtr6285 and murata front-end module instead of reference design-sony antenna switch module + epcos saw filters.my selected module has measured evb out-band attenuation (close to in-band and high side ...
RF, Microwave, Antennas and Optics :: 20 Nov 2009 5:48 :: kspalla :: Replies: 1 :: Views: 57
second harmonic in gsm(900)
in gsm 900, the gsm modem i am using has a radiated second harmonic more than -30 dbm (violates etsi). testing the modem revealed that the conducted second harmonic at 1800 was -42 dbm. my antenna gain at 1800 is 3 dbm. i am not sure where the 9 db g...
RF, Microwave, Antennas and Optics :: 19 Nov 2009 15:52 :: Wilson_yu_chen :: Replies: 8 :: Views: 804
sim300 breakout pcb design - let's fab some pcbs :)
hello,some time ago someone mentioned that they have designed a breakout pcb for that pesky gsm module - but the thread went dead and i didnt hear back from that person.if anyone had done a pcb design for breakout board for sim300 module, please let ...
Professional Hardware and Electronics Design :: 17 Nov 2009 3:20 :: naeemafar :: Replies: 45 :: Views: 11125
mobile communication project on matlab
hi every1 ive just finished cdma project on fpga boards the design is from a-to-z digital even the summation process if any1 interested i can give a hand...,...
Digital communication :: 16 Nov 2009 17:53 :: rahul bakshi :: Replies: 68 :: Views: 8857
why do we use the 60 ghz band?
out the 60 ghz band, but generally the tens of gigahertz bands.1. i know that cellular service providers use microwave links @ ~30 ghz to transmit data with high capacity. why cant they use their own gsm/wcdma/etc. frequency bands for the same purpos...
RF, Microwave, Antennas and Optics :: 13 Nov 2009 13:15 :: Abhishekabs :: Replies: 7 :: Views: 354
2.4ghz or 5.2ghz ifa (inverted "f" antenna),who ha
i am doing some simulations with ansoft hfss on ifa.the 2.4ghz dimension fits good both on simulation and measurment with the reference dimension.i want to simulate the 5.2ghz ifa, but i have no reference to compare.does anyone have the design dimesi...
RF, Microwave, Antennas and Optics :: 09 Nov 2009 13:25 :: ahsaan :: Replies: 83 :: Views: 12146
simple gps gsm sstem questions
hi all, id like to know how the following gps/gsm module could function. it should be in a car, such that when ever the car moves into a interest point, the gps module should alert in a certain way. interest points are places on the central server wh...
Digital communication :: 31 Oct 2009 6:25 :: slapdash :: Replies: 0 :: Views: 90
gsm sim card interfacing with microcontroller
hi to all,i have an idea to interface any gsm sim card directly to microcontroller but not conceptually clear...so pls can anyone tell me that it is possible to do that or not....if possible then what kind of microcontroller must be used for that pur...
Microcontrollers :: 21 Oct 2009 6:56 :: PS23 :: Replies: 9 :: Views: 852
gprs modem interface proceduer
i am starting to design a telemetry system using sms. any sugestions about gsm modules? thanks in advance....
Professional Hardware and Electronics Design :: 17 Oct 2009 3:44 :: printed circuit girl :: Replies: 191 :: Views: 52537
sim300d antenna traces routing
hello i am putting sim300d in my design. it provides gsm rf antenna interface via its smd pins. manual says that the routing should be a microstrip line to the antenna. i intend to connect it to an off-the-shelf patch antenna. what i understand is th...
RF, Microwave, Antennas and Optics :: 13 Oct 2009 11:20 :: ShahbazAli :: Replies: 0 :: Views: 141
[vswr] q2686 antenna specification
hi friends i have one gsm quad band antenna with gain 2 dbi and vswr < 2 : 1is this suitable for q2686 wavecom module ? in the antenna specification for the module; vswr is given as : rx max 1.5 : 1tx max 1.5 : 1is this safe to select an antenna h...
Professional Hardware and Electronics Design :: 07 Oct 2009 12:09 :: gsmman :: Replies: 0 :: Views: 135
urgent !! pls help ... insertion loss of rg# rated cables ?
hi friends please help me to find anrf cable with less than 1db attenuation @ 900mhz what will be the insertion loss of rg# rated cables ?/ plss helpthanks in advanceroy...
RF, Microwave, Antennas and Optics :: 04 Oct 2009 16:40 :: biff44 :: Replies: 6 :: Views: 147
sim340e b2b connector/antenna adapter cable
hi friends i am new to gsm and i want to use sim340e gsm modem. unfortunately the board to board connector entery is not available to our local distributor :( can we go for other board to board connector for the module ? in the antenna part , we ha...
Microcontrollers :: 30 Sep 2009 13:34 :: gsmman :: Replies: 0 :: Views: 60
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square wave noise filter for a microphone preamp
please help me with this:i made an rf audio tx device, it has a mic input digitizes the voice and sends it over 900 mhz to the rx device which than records it.the problem is that the mic is located close < 8cm to the antenna and i get the 16ms (~6...
Analog Circuit Design :: 29 Sep 2009 13:39 :: Zedman :: Replies: 10 :: Views: 357
sim300
hi everybody, is here any one working on sim300 if so, is there any thing to be added other than the circuit provided in schematics provided in ver 2.02. because i getting rdy after power on but its not detecting sim card when sim card is placed. i ...
Professional Hardware and Electronics Design :: 16 Sep 2009 9:54 :: mpch_elec :: Replies: 145 :: Views: 37837
gsm jammer
well as a small project one of my frnds wanted to design a gsm jammer circuit.what wud be the requirements for such a design. he wanted to know more abt this ckt.. is it possible to jam cdma signals.. as per my knoledge gsm operates at low power so i...
Hobby Circuits and Small Projects Problems :: 15 Sep 2009 18:39 :: AKSHAYVH :: Replies: 65 :: Views: 30179
gsm antenna output impedance
hii am using a gprs/gps modulei face a strange problem suddenly the gprs is not working and when i measure the impedance on the antenna connector i found it equals to 1.2 ohm, i m expecting to see 50 ohmsam i true? dose that means that the lna and pa...
RF, Microwave, Antennas and Optics :: 10 Sep 2009 16:49 :: GSM Man :: Replies: 8 :: Views: 354
need suggestion for choosing ms project
hello i have my bachelor in electronics and wish to do ms in communication.i have interest in digital/satellite communication and computer networking and wish to learn further by choosing project (general). general topic related to above will give me...
Digital communication :: 03 Sep 2009 10:59 :: Communications_Engineer :: Replies: 4 :: Views: 210
amount of magnetic flux density in the antenna gsm
hello all friendsplease help me about with of electric and magnetic field intensity in the antenna gsm and amount of magnetic flux density in gsm and also show them by chart according v/m am/m and tesla best regards...
RF, Microwave, Antennas and Optics :: 02 Sep 2009 7:18 :: mehdi_an :: Replies: 0 :: Views: 69
re: designing antenna matching circuit - newbie question
in fact here is the sonnet design file im using for the murata footprint...
Electromagnetic Design and Simulation :: 20 Aug 2009 4:58 :: rubeng :: Replies: 1 :: Views: 293
question about impedance/resistance
ecommunication), most of them also have dc resistance of 50 ohm. why and how do they get 50Ω dc resistance? how about antennas? do all of them have 50Ω dc resistance? for example antenna of gsm radio base station. thanks....
RF, Microwave, Antennas and Optics :: 07 Aug 2009 10:54 :: htforever :: Replies: 2 :: Views: 174
ieee paper - a wide bandwidth and wide beamwidth cdma/gsm...
hi,can i have this paperhttp://ieeexplore.ieee.org/iel5/25/30904/01433236.pdf?arnumber=1433236a wide bandwidth and wide beamwidth cdma/gsm base station antenna array with low backlobe radiationwong, t.p.; luk, k.m.vehicular technology, ieee transac...
RF, Microwave, Antennas and Optics :: 23 Jul 2009 15:31 :: wave85 :: Replies: 1 :: Views: 207
ieee papers- urgent (30 points)
hi,can i have these papers?the links arehttp://ieeexplore.ieee.org/iel5/7260/33145/01561316.pdf?arnumber=1561316http://ieeexplore.ieee.org/iel5/10745/33869/01613505.pdf?arnumber=1613505http://ieeexplore.ieee.org/iel5/8/33036/01549974.pdf?arnumber=154...
RF, Microwave, Antennas and Optics :: 22 Jul 2009 11:03 :: Ashubhu :: Replies: 1 :: Views: 216
gsm and cdma antenna
can anyone compare gsm and cdma antenna of bts for me.thank for reading...
RF, Microwave, Antennas and Optics :: 14 Jul 2009 5:37 :: bkd :: Replies: 2 :: Views: 309
sim300/sim305 without antenna?
all most all the mobile phones are not having external antenna. they are doing some work in pcb so it works as antenna. they dont requier any antenna.could anybody help me out how to use sim300 with out antenna by doing some work in pcb?...
PCB Routing & Schematic Layout software & Simulation :: 13 Jul 2009 19:37 :: GSM Man :: Replies: 5 :: Views: 366
the difference between 2 g and 3 g antenna, cdma and gsm ant
hi guyi need the diference between 2 g and 3 g antenna, also gsm and cdma antenna. if you guy have them, please put them on this topic...
RF, Microwave, Antennas and Optics :: 08 Jul 2009 8:26 :: bkd :: Replies: 0 :: Views: 141
want information on antenna rediation pattern used in gsm
use the cell capacity by doing sectorizationfor that i need to analyze the interference due to inter-sector to do that can anybody help me how to do thati dont have any idea on antenna being used in gsm...
Digital communication :: 07 Jul 2009 18:24 :: catchpraful :: Replies: 0 :: Views: 185
help regarding sim340e - help me in selecting antenna
hi guys,i am new to gsm and i wnat to use sim340e gsm modem. i have to interface it with 8051 controller and have to reaceive/transmit data through gsm network. i have selected sim340e but now i am cofused about antenna. can anybody help me in select...
Microcontrollers :: 20 Jun 2009 8:11 :: choto :: Replies: 2 :: Views: 264
rf switch in 13.56mhz
hi,all.i used a power switch at the front of 13.56m transmitter,but the effect is very bad,the switch module is macom masw-007813 and some voltage control circuit,datasheet claims operating range is dc-3g,i previously used it very well in 915m rfid r...
RF, Microwave, Antennas and Optics :: 13 Jun 2009 10:19 :: FvM :: Replies: 9 :: Views: 534
problem with terminal gsm mc35i
hi, i can not get answers when you send an at command for hyperterminal led to the terminal is psycho normal, put the 2 pictures attached configuration of the hyperterminal thanks for the help...
PC Programming and Interfacing :: 12 Jun 2009 17:07 :: fmiksian :: Replies: 2 :: Views: 312
gsm mobile network- need ideas and help to start the project
hi all, i am pleased by this forum.... infact i am preparing for my graduation project in cce computer and communication engineering.... i am thinking in a small gsm mobile network in the legal frequency domain .... please help me start .... if u can...
Digital communication :: 08 Jun 2009 7:35 :: leekk8 :: Replies: 6 :: Views: 594
wavecom gsm no activity - how should hte device be powered?
i recently purchased (ebay) a wavecom gsm module which came with the device itself, serial cable and antenna. after connecting the device to the computer, there is no activity light, should there have been a power cable that should have been shipped ...
Digital communication :: 05 Jun 2009 10:19 :: dalekurt :: Replies: 0 :: Views: 147
sim700d: what should the min signal quality be for gprs?
hi,what should the min signal quality be for proper gprs connection?my sim700d returns (22,0) for at+csq.rssi = 22ber = 0are these values ok?parameters for at+csq<rssi>: 0 -113 dbm or less 1 -111 dbm 2...30 -109... -53 dbm ...
Professional Hardware and Electronics Design :: 02 Jun 2009 17:33 :: BasePointer :: Replies: 2 :: Views: 330
gsm signals detection
hi,, i have a question about gsm signals,that when we make or receive calls what kind of signals are there and can we detect these signals??...
Digital communication :: 18 Apr 2009 6:28 :: pranam77 :: Replies: 16 :: Views: 1167
wireless notice board help
doing a project on wireless notice board using two pic16f877s,one interfaced to a pc and transmitter and the other to a receiver with a lcd module.to increase the range i have thought of involving a gsm kit so that using sms i can display the data r...
Embedded Systems and Real-Time OS :: 11 Apr 2009 6:51 :: pramodm :: Replies: 4 :: Views: 489
what value does the solution frequency i need to setup?
hi,everybodyi design a dual-band antenna with the hfss software. the antenna is designed for the gsm system and has the operation frequency of 900 mhz and 1.8 ghz, respectively. but the hfss simulator has a solution frequency option for the computing...
RF, Microwave, Antennas and Optics :: 09 Apr 2009 16:41 :: weiweia :: Replies: 1 :: Views: 120
gsm band stop filter in gsm frequency with hfss
hi guys , i want to design a bandstop filter in gsm frequency ( 870 mhz - 960 mhz ) with hfss , i am an amateur. this filter is for transmittering antenna and my prof wants the filters capacity upto 200 watt , i have searched about high power filter...
RF, Microwave, Antennas and Optics :: 30 Mar 2009 10:57 :: kspalla :: Replies: 3 :: Views: 423
please , i need these papers
please , i need these papers 1-o. kivekäs, t. lehtiniemi, and p. vainikainen, ”on the general energy-absorption mechanism in the human tissue,”microwave and optical technology letters, vol. 43, no. 3, nov. 2004, pp. 195-201.2-p. vainikainen, j. ollik...
RF, Microwave, Antennas and Optics :: 06 Mar 2009 9:46 :: shameemkabir :: Replies: 5 :: Views: 243
one antenna for wlan and bluetooth
hi,is it possible to use only one antenna for a wlan / bluetooth application if the antenna is multiplexed? does someone know such a device? i thougth it can be implemented like this:pcb antenna (2.4ghz) --> multiplexer |--> balloon 1 --> rf ic1........
RF, Microwave, Antennas and Optics :: 06 Mar 2009 7:30 :: kspalla :: Replies: 9 :: Views: 624
antenna detector circuitry
hi,does anyone know how it is possible to implement a low-cost effective antenna detector circuit for gsm, umts and gps technologies?i need material, whitepapers, and possibily reference designs.thank you in advance.n....
RF, Microwave, Antennas and Optics :: 21 Feb 2009 18:32 :: McShamrock :: Replies: 2 :: Views: 183
antenna simulation in matlab
i need code for antenna simulation in matlab .can please anyone help me?...
Electromagnetic Design and Simulation :: 18 Feb 2009 20:26 :: aze :: Replies: 5 :: Views: 837
gsm module "siemens mc55"
hii am planning to use gsm module to interface it with pic microcontroller to send and receive sms, can u recomend me any modules u worked with, i have searched the web and found the mc55 from siemens and i think it is suitable, since it supports tex...
Microcontrollers :: 23 Jan 2009 19:39 :: gorkin :: Replies: 2 :: Views: 1296
dual band gsm antenna
hai alli just found homemade antenna for dual band gsm.http://images.elektroda.net/6_1229491746.jpgbut didnt found the dimention and size.someone had spesification?thankshuys cobb...
RF, Microwave, Antennas and Optics :: 29 Dec 2008 0:04 :: Aya2002 :: Replies: 1 :: Views: 663
gsm 900 antenna
hy guys!i design a patch antenna for gsm 900 but it not cover all the band (880 mhz-960 mhz) and i would like to know if a patch its a good idea?how to cover this band? do i make a stacked antenna? after making one element, i need to make and array d...
RF, Microwave, Antennas and Optics :: 25 Nov 2008 14:39 :: balaguru thavamani :: Replies: 4 :: Views: 657
help!some like oscillating.what's the it?
when i dont add signal to my chip,it shows about -50dbm signal at 1.8g.why?is my chip is osillating ,but its so small.its a differential amplifier.who can tell me whats that?thanks........
Analog Circuit Design :: 25 Nov 2008 8:27 :: saro_k_82 :: Replies: 18 :: Views: 468
reflective open and reflective short switch
what is the difference between reflective open and reflective short rf switches?what are the applications for each of them ?for selection between 2 anttena for a transceiver which of them should be used and why?...
RF, Microwave, Antennas and Optics :: 07 Oct 2008 8:47 :: kspalla :: Replies: 6 :: Views: 228
antenna article
hi dear freinds,can any one please send me the following articles:1) hsi-tseng chou jin-song wang da-jen wu applications of shielding techniques to reduce sar induction in human head published in antennas and propagation society international s...
Electromagnetic Design and Simulation :: 01 Oct 2008 23:00 :: simotic :: Replies: 4 :: Views: 252
sar _ antenna _ articles
hi dear freinds,can any one please send me the following articles:1) hsi-tseng chou jin-song wang da-jen wu applications of shielding techniques to reduce sar induction in human head published in antennas and propagation society international s...
RF, Microwave, Antennas and Optics :: 01 Oct 2008 5:11 :: simotic :: Replies: 0 :: Views: 204
give me good gsm
i work project contain 8051 and gps reciver and gsm help me in to find the suitable gsm mdoule for my project(gsm work in serial , low cost)...
Microcontrollers :: 28 Sep 2008 13:55 :: fatima_just :: Replies: 6 :: Views: 510
gsm module at commands
hi,i am using sim300d gsm module.issue 1: are there any at commands , which can be used to stop +cbm.i get +cbm: 6128,50,1,1,1+cbm: 6128,50,1,1,1+cbm: 6128,50,1,1,1+cbm: 6128,50,1,1,1+cbm: 6128,50,1,1,1+cbm: 6128,50,1,1,1again and again..and the mod...
Professional Hardware and Electronics Design :: 27 Sep 2008 6:21 :: movie_freak :: Replies: 6 :: Views: 2025
tracking system - gps or rf ?
presentation on what factors to consider in designing a tracking system embedded in the cash-in-transit products. i have googled such systems and also on this board, most of the people suggest a gps-gsm embedded system i.e. finding the location thro...
RF, Microwave, Antennas and Optics :: 23 Sep 2008 13:44 :: vfone :: Replies: 3 :: Views: 282
can anybody help me to find these ieee papers,thx.
eng., nat. sun yat-sen univ., kaohsiung, taiwan); kin-lu wong; jeen-sheen row source: microwave and optical technology letters, v 50, n 4, april 2008, 1126-32 2. internal meandered loop antenna for gsm/dcs/pcs multiband operatio......
RF, Microwave, Antennas and Optics :: 01 Sep 2008 5:09 :: bambio :: Replies: 1 :: Views: 174
gsm module for mms
hi, has anyone tried using gsm module to send mms? my intent is to use a micro-controller to control the gsm module to send and receive mms to and from a mobile phone. any recommendations for the gsm module to use? thanks...
Professional Hardware and Electronics Design :: 03 Aug 2008 4:48 :: Yeeching :: Replies: 1 :: Views: 390
ieee paper request
hello everyoneanyone have any paper for folded dipole antenna please send to mei am need to study that paper to do my project. hope i can get that paper that relate for gsm band frequency 880 960mhz and 1710-2170mhz...
Electromagnetic Design and Simulation :: 23 Jul 2008 0:59 :: kyg :: Replies: 2 :: Views: 201
reduced size ground plane antenna
hi to all! i need to design a dual band antenna with reduced size ground plane for my thesis: does anyone have any suggest or article?thanksbye...
Electromagnetic Design and Simulation :: 22 Jul 2008 4:32 :: balaguru thavamani :: Replies: 3 :: Views: 240
ieee paper request
i need this papermultiband folded dipole antenna for mobile phoneishimiya,k.takada,j-idept.of int.dev.eng.,tokyo inst of technolthis paper appears in:antenna technology:small and smart antennas metamaterials and applications 2007.iwat07.international...
RF, Microwave, Antennas and Optics :: 18 Jul 2008 9:51 :: YCChiou :: Replies: 1 :: Views: 189
want seminar topics
want seminar topics in electronics and communication engineering...
General :: 17 Jul 2008 5:40 :: chandregowda :: Replies: 1 :: Views: 474
what is a difference in electrical and mechanical tilt?
dear all, i am confused about both types of tilts given to bts antenna in gsm networks. someone please clarify it. thank you....
RF, Microwave, Antennas and Optics :: 17 Jul 2008 5:09 :: balaguru thavamani :: Replies: 2 :: Views: 264
microstrip design
hi to all!can anyone tell me how to design a 50ohm microstrip line that work on 900mhz, 1800mhz, 2100mhz, 2500 mhz?i have to built in on fr4 (epsr=4.4 tangentloss=0.02 1.6mm thikness) to feed a monopole slot antenna.i try to use txline software but i...
Electromagnetic Design and Simulation :: 02 Jul 2008 18:16 :: RF-OM :: Replies: 13 :: Views: 831
ieee papers request
ffrey shiang fuantennas and propagation, ieee transactions onvolume 54, issue 2, feb. 2006 page(s): 613 - 619digital object identifier 10.1109/tap.2005.863088low-profile planar monopole antenna for gsm/dcs/pcs triple-band mobile phonelee......
Electromagnetic Design and Simulation :: 28 Jun 2008 18:23 :: Bhanumurthy :: Replies: 1 :: Views: 165
homemade antenna for triband gsm
hallodid someone had url link how to made vertical type (omni) antennas for triband gsm?thankshuys...
RF, Microwave, Antennas and Optics :: 27 Jun 2008 8:18 :: huys cobb :: Replies: 6 :: Views: 270
omni directional for gsm
hallodid someone know hows to made omni/vertical antenna for tri band gsm/gprs900/1800/1900mhz?thankshuys...
Digital communication :: 24 Jun 2008 8:32 :: huys cobb :: Replies: 2 :: Views: 190
need layout skill about antenna
hi i need some document about gps or gsm or wlan... antenna pcb layout or layout skill anybody can help me ?thanks in advance!...
Professional Hardware and Electronics Design :: 06 Jun 2008 15:06 :: bless_fooling :: Replies: 0 :: Views: 201
please recommend textbook of communication system.
i need the communication textbook with more mathmatics derivation and explain in more detail.thanks,...
Digital communication :: 06 Jun 2008 8:18 :: ittefaq11 :: Replies: 56 :: Views: 5145
double ground plane?
hi to all!im trying to simulate a 3 band microstrip monopole for gsm/gprs/umts usb modem. the problem is that the monopole is connected to the pcb but there is another pcb under the first one; ive done several simulation and i see that the second pcb...
Electromagnetic Design and Simulation :: 01 Jun 2008 12:13 :: on1 :: Replies: 4 :: Views: 195
help me with the monopole simulation (hfss)
hi, friends. i am a greenhand in mobile ant design. here i simulate a monopole ant, but there are error or mistakes. i remember the ant should work as the lambda/4. i want it to work at gsm 900mhz, dcs 1800mhz and pcs1900mhz. what should i do to modi...
RF, Microwave, Antennas and Optics :: 30 May 2008 3:30 :: SparkZhang :: Replies: 4 :: Views: 654
plastic material hfss
hi to all. im simulating a monopole for an gsm/gprs/edge/umts/hspa application but i have a problem. the monopole is located on a plastic support (thickness=1mm) 3mm over fr4 substrate. (see image for details). does anyone know which type of material...
Electromagnetic Design and Simulation :: 29 May 2008 23:20 :: Azulykit :: Replies: 3 :: Views: 210
a dual band circularly polarised microstrip antenna
i want to know that in sonnet software1- is it possible to simulate rectangular ring microstrip antenna hiow?2-can probe feed may be given on patch surface diagonally how?...
Electromagnetic Design and Simulation :: 29 May 2008 14:05 :: Manjunatha_hv :: Replies: 3 :: Views: 384
problem with antenna measurement setup...
hi all,im in trouble with a problem on antenna measure of resonance and gain.its since a long time im trying to resolve my doubt but its still present.im dealing with antennas for gsm, wlan applications. small printed antennas on pcb or also ceramic ...
RF, Microwave, Antennas and Optics :: 14 May 2008 15:57 :: ghb :: Replies: 3 :: Views: 324
bluetooth antenna vs gsm antenna
dear all, many gsm phone embeded bluetooth function. how bluetooth shareantenna with gsm module? you know gsm work in different band from bluetooths.best wishes...
RF, Microwave, Antennas and Optics :: 14 May 2008 15:47 :: ghb :: Replies: 3 :: Views: 144
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