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is analog circuit design dead ?
any thoughts on this ?----analog experts eye moores lawsan diego — a panel of analog and process experts looked at the challenges posed by moores law and concluded that somethings got to give. charlie sodini of massachusetts institute of technology o...
Analog IC Design & Layout :: 26 Mar 2006 9:43 :: piao :: Replies: 19 :: Views: 2397
how to match impedance for gsm/dcs dual band antenna?
the gsm/dcs or gsm/pcs antenna is dual band.i want to know how to design the impedance matchment for it.i can only do it for single frequency, just transform from one point to another on the smith chart by 2 lump component (l or c).but for 2 bands, w...
RF, Microwave, Antennas and Optics :: 22 Mar 2006 13:56 :: ssstar :: Replies: 5 :: Views: 444
power meter to test for gsm phone antenna
can anyone advice me on whether it is appropriate to use power meter to test for gsm phone antenna. the test is to ensure that the antenna is connected/soldered properly onto the pcb. it can be on any gsm band. it is feasibility to do it?thanks!!!...
Digital communication :: 12 Mar 2006 15:02 :: Jornada :: Replies: 1 :: Views: 233
a question about antenna coupling
hi, i have a question about the antenna coupling. when two antennas are strongly coupled with each other, and the input signal power ratio to these two antennas changed, what kind of characteristic will be changed correspondingly? i feel that the rad...
Electromagnetic Design and Simulation :: 01 Mar 2006 1:52 :: jian :: Replies: 9 :: Views: 639
simulation for a small gsm cellphone repeater
i need help in choosing a simulation package(software) to simulate a gsm phone repeater operating on 1900 mhz or 850 mhz which are the 2 main frequency band used in canada.does anybody knows how to do this or anybody have done this simulation and i n...
RF, Microwave, Antennas and Optics :: 27 Feb 2006 23:03 :: b_tonymontana :: Replies: 0 :: Views: 177
urgent: help needed on impedance matching in antenna
hi to all, i am a part of a research group that is presently investigating the feasibility of powering sensor nodes.. our work involves the design of an antenna and a rectifier circuit. the rectifier uses a zero-biased schottky diode (agilent ...
RF, Microwave, Antennas and Optics :: 27 Feb 2006 12:43 :: vfone :: Replies: 4 :: Views: 318
antenna test for phones using power meter
can anyone advice me on whether it is appropriate to use power meter to test for gsm phone antenna. the test is to ensure that the antenna is connected/soldered properly onto the pcb. it can be on any gsm band. it is feasibility to do it? thanks!!!...
RF, Microwave, Antennas and Optics :: 26 Jan 2006 22:20 :: plasma :: Replies: 7 :: Views: 283
ADS
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asking projects for hfss
salam alli am new to this eda board comm.but i really like the way you people are helping eachother.and i thought to ask help for my selfi have just learnt the basics to use the hfssv9.now i want to make some good projects of antenna design.can any o...
Electromagnetic Design and Simulation :: 17 Jan 2006 15:43 :: helio1972 :: Replies: 6 :: Views: 498
mobile radio
do the cel phones have separate antenna for fm radio.wat is the necessity of headset in it. without connecting headset radio does not work. what purpose does headset serve.thanks...
Digital communication :: 06 Jan 2006 17:48 :: azaz104 :: Replies: 6 :: Views: 737
antenna used in gsm
hi all,which antenna is used in a gsm mobile unit and the cell site?thanks...
RF, Microwave, Antennas and Optics :: 08 Dec 2005 23:01 :: plasma :: Replies: 6 :: Views: 774
antenna suppliers
im looking for patch antennas suppliers especially for the uhf bands in eu, us and japan, i.e. 868, 915 & 950 mhz.i know hyperlinktech.comany others?...
RF, Microwave, Antennas and Optics :: 30 Nov 2005 12:00 :: dch316 :: Replies: 3 :: Views: 243
hfss excitation
hi, while simulating a dipole antenna for the 900 and 1800 gsm bands in hfss, i faced this problem that i can not choise the deloivred power to the dipole, so i, excit it just by using lumed port. so please if you can help me to excite the dipole wi...
Electromagnetic Design and Simulation :: 14 Nov 2005 17:33 :: smnobo :: Replies: 0 :: Views: 300
what is purpose use of saw filters ?
all of the mobile phones do use one or more saw filters in the design.why cant we use another filters?...
RF, Microwave, Antennas and Optics :: 08 Nov 2005 11:04 :: zampanampa :: Replies: 4 :: Views: 360
how to design small gsm/dcs pcb antenna ?
i want to lay a gsm/dcs antenna directly to pcb. so the size of it should not be too large. attachment is my design. (red is top view, blue is bottom view)the resonate frequency is just tunable, and can be the point i want. but the bandwidth is too n...
RF, Microwave, Antennas and Optics :: 05 Nov 2005 1:32 :: yellowtooth :: Replies: 10 :: Views: 2286
microwave link problems
dears:we are encounter a problem in 15ghz link near to military base and it seams that the problem comes from an interferance from the military radar, we solve the problem by change the frequency from 15ghz to 7 ghz, my question is who can i solve th...
RF, Microwave, Antennas and Optics :: 30 Oct 2005 18:02 :: rami.masadeh :: Replies: 8 :: Views: 612
how to design small gsm/dcs pcb antenna ?
i want to lay a gsm/dcs antenna directly to pcb.so the size of it should not be too large.attachment is my design.the resonate frequency is just tunable, and can be the point i want.but the bandwidth is too narrow.what sould i do next ?any other desi...
Professional Hardware and Electronics Design :: 29 Oct 2005 8:59 :: yellowtooth :: Replies: 1 :: Views: 375
quad band antenna for gsm bands
hi,can anybody spare me any idea about designing a quad-band antenna to cover all the four gsm bands(850,900,1800,1900).im trying to design one simple,possibly single layer microstrip patch antenna(pifa) for these four bands.any idea or suggestions o...
RF, Microwave, Antennas and Optics :: 17 Oct 2005 16:58 :: vfone :: Replies: 3 :: Views: 447
antenna design problem
dear all: i have a hard problem in antenna design.i must design a gsm antenan into volume of 60x7x5mm3. and i need the bw about 140mhz in 900mhz. the problem is that it is possible or not. i mean that it is the limited of physic. o...
RF, Microwave, Antennas and Optics :: 24 Sep 2005 6:02 :: woshifanka :: Replies: 3 :: Views: 243
improving gsm antenna
hi,ive got a little problem, sorry if it could be off topic.in my house my gsm doesnr get a good signal. is there a way to improve it?is there some device (active or not) able to improve signal on my gsm antenna?thanks a lot...
RF, Microwave, Antennas and Optics :: 12 Sep 2005 14:14 :: throwaway18 :: Replies: 1 :: Views: 150
gsm antenna
i have a gsm module that has a very small connector soldered on it. i dont have the cable to connect the antenna to it. i also have a car antenna for mobile phones that has a few feet of 50ohm cable. can i desolder the connector on the gms module, cu...
RF, Microwave, Antennas and Optics :: 09 Sep 2005 10:57 :: Buriedcode :: Replies: 3 :: Views: 570
can i introduce my company to you?
antetec technologies ltd, established in 2003, mainly specializes in r&d and manufacturing telecommunication terminal equipments and related accessories. we are energetic high-tech team with experienced designers and precise corporate culture. our la...
Business Special Interest Group :: 17 Aug 2005 7:57 :: baoguo.jiang :: Replies: 0 :: Views: 1956
help to find standard antenna for gain measurement
hi there,i will like to measure gain of an aut in an anechoic chamber. i need a standard gain antenna. anyone like to recommend any supplier with a website that i can get one quite cheaply?any suggestions to obtain gain without the standand gain ante...
RF, Microwave, Antennas and Optics :: 11 Aug 2005 14:07 :: biff44 :: Replies: 8 :: Views: 548
gsm antenna
what sort of antennas are used in gsm communication....... can anyone provide any docs.. abt gsm antennas....
RF, Microwave, Antennas and Optics :: 07 Aug 2005 23:06 :: pir0texnik :: Replies: 2 :: Views: 273
why we use carrier 10 times greater than modul
when we are modulating a signal why we use carrier frequency ten times more than modulating frequency?...
Electronic Elementary Questions :: 07 Aug 2005 22:01 :: ocarnu :: Replies: 3 :: Views: 198
help:gsm's phase eror
hi allwhen i measure the phase error of dcs and pcs.if tx power is more than 22dbmthe phase error of 0-6 bits were increase and failed, other bits were not.i use midamble to synchronize burst, frequency is ok.what will cause the phase error?please he...
RF, Microwave, Antennas and Optics :: 19 Jul 2005 16:26 :: katykaty03 :: Replies: 23 :: Views: 1636
gsm signal reception improvement
i am living in crowded area on hill top and using gsm mobile sim. i ve problem of poor reception of mobile signal. sometime good range(reception) is there, sometimes no range at all. range goes on varing, so frequently call gets dropped. i tried diff...
Service Manuals, Requests, Repair Tips :: 01 Jul 2005 9:49 :: eda4you :: Replies: 4 :: Views: 717
mobile phone-cabinet radiation
himobile phone has to pass fta.one of test item is called radiation emission in gsm 12.2 .i saw etsi gsm 12.2.1,which is called cabinet radiationby my previous experience,we always test radiation emissionby air link the bs for testing. does cabinet r...
RF, Microwave, Antennas and Optics :: 20 Jun 2005 10:49 :: mbq :: Replies: 12 :: Views: 822
discussion: antenna diversity
hi, any good articles best describe the antenna diverity?if we assume using two antennae(1) how these two antenna oriented?(2) in what distance should be separated ?any idea welcomed!rayengine...
RF, Microwave, Antennas and Optics :: 20 Jun 2005 10:33 :: mbq :: Replies: 22 :: Views: 2167
gsm antenna
what is the antenna type used in the gsm bts and the ms ?...
RF, Microwave, Antennas and Optics :: 19 May 2005 19:37 :: mogwai :: Replies: 2 :: Views: 414
multiple gsm devices(transceivers)sharing only one antenna
hello everyone,is it possible for a group of gsm mobile devices(transceivers of course) to share one gsm antenna. i have heard that similar devices exist, but on the other hand how do they prevent permanent damage of the receivers inputs during trans...
RF, Microwave, Antennas and Optics :: 13 May 2005 12:46 :: polarized :: Replies: 0 :: Views: 159
how to calculate power gain of an antenna or antenna array ?
n you show me how to calculate gain of antenna array ?details: an antenna array for bts (base transceiver station) assume that: i have an microstrip antenna array; 4 elements. fr = 900mhz (gsm). trace is bakelite εr = 4.8 , dielectric...
Electromagnetic Design and Simulation :: 28 Apr 2005 23:13 :: plasma :: Replies: 1 :: Views: 624
gsm-cdma talktime
hellodoes anybody know how to estimate the talktime of a gsm or cdma mobile?i know the tx and rx current consumption, the pa efficiency, battery capacity and voltage, and the pout vs time.any formula, datasheets or links are welcomethanks...
RF, Microwave, Antennas and Optics :: 21 Apr 2005 11:50 :: as_518 :: Replies: 8 :: Views: 957
gsm test--am suppression
can anyone who know how to test this item am suppression for gsm phone.any document describe this measurement method ??thanks for your help....
RF, Microwave, Antennas and Optics :: 15 Apr 2005 8:34 :: vfone :: Replies: 5 :: Views: 954
is there anybody can talk about single-chip for gsm?
hi all,i guess that most of you know that ti delivers single-chip solution for gsm to nokia.can anyone tell me whether ti employ pure cmos tech only or bicmos tech. if it is cmos, does it mean that bipolar is dead already?thanks....
Analog Circuit Design :: 15 Apr 2005 5:04 :: Wilson_yu_chen :: Replies: 6 :: Views: 450
ground plane split
hi all, im desgning a board containing a gsm engine, a slic , a daa and a codec. the slic, the daa and the codec are mixed signal devices that contains an a/d and a d/a and the manufacturer of this silicon reccomends the use of a separate analog and ...
PCB Routing & Schematic Layout software & Simulation :: 14 Apr 2005 13:42 :: cesare :: Replies: 3 :: Views: 360
ground plane split
hi all,im desgning a board containing a gsm engine, a slic , a daa and a codec. the slic, the daa and the codec are mixed signal devices that contains an a/d and a d/a and the manufacturer of this silicon reccomends the use of a separate analog and d...
RF, Microwave, Antennas and Optics :: 08 Apr 2005 20:26 :: biff44 :: Replies: 1 :: Views: 123
broadband antennas
i want to know, why is so important these kind of antennas?, also, i´m looking for their application. thanks....
RF, Microwave, Antennas and Optics :: 23 Mar 2005 2:36 :: asdfaaa :: Replies: 4 :: Views: 405
req: samsung mobile phone
do you ever check or explore the structure of samsung gsm phone ? we measured its sensitivity , its very good when use inside antenna (slide phone)or outside antenna . i found it made some improvement on grounding around fpc connecting, but its fpc ...
RF, Microwave, Antennas and Optics :: 24 Feb 2005 5:29 :: xinxin :: Replies: 1 :: Views: 150
sensitivity improve on slide-phone
i have a slide-phone with inside antenna , but gsm sensitivity is only -90dbm through the radiation , i also found fpc could improve it about 3db through outside gnding . could u help me and give me some adivse or suggestion to hoe to improve it.tha...
RF, Microwave, Antennas and Optics :: 26 Jan 2005 8:17 :: brmadhukar :: Replies: 2 :: Views: 222
automatic vehicle location using gps and gsm
hi friendsim currently working on an automatic vehicle location(avl) system using gps and a gsm mobile phone. im using the lassen sq gps module and a nokia 3310 mobile phone with an f-bus interface for my project.im currently having a few problems. i...
Hobby Circuits and Small Projects Problems :: 26 Jan 2005 8:13 :: brmadhukar :: Replies: 6 :: Views: 972
have a gsm antenna near me and need to measure a power
please help....
RF, Microwave, Antennas and Optics :: 20 Jan 2005 18:07 :: kima :: Replies: 9 :: Views: 513
why not use circular polarization antenna in wireless comm.?
no matter in gsm or cdma or phs..., in base station, linear or dual-polar antenna are using ,while in handheld terminals always using linear-polar.why doesnot use circular-ploar antenna to minimize the polarization mismatch?thanks!...
RF, Microwave, Antennas and Optics :: 10 Jan 2005 10:52 :: wusen :: Replies: 7 :: Views: 612
about match network from pa to switch ?
any guys konws how to make a match network from pa to switch ?...
RF, Microwave, Antennas and Optics :: 01 Dec 2004 21:50 :: vfone :: Replies: 9 :: Views: 558
how r fading effects overcome in gsm mobiles
how do we overcome reighley fading in a gsm mobile ? what device do we use?...
Digital Signal Processing :: 17 Oct 2004 9:24 :: videohu :: Replies: 6 :: Views: 471
connecting a gsm with gps
dear friends could you please tell me what connectors /cable you are using to connect a gsm with gps what are the software required to transfer the cordinmates from gps to gsm as sms.with regardshemraj...
Microcontrollers :: 04 Oct 2004 17:57 :: redfred :: Replies: 3 :: Views: 504
what is the vswr?
i want to know about vswr. anyone help me....
RF, Microwave, Antennas and Optics :: 12 Sep 2004 12:55 :: FreeSpirit :: Replies: 6 :: Views: 771
fractal antenna research and design
hi!is here anybody who is interested in this exciting topic(means fractal antennas, fractal resonators, fractals in electromagnetics and other applications)?? id like to share my experiences with other antenna researchers.eirp...
RF, Microwave, Antennas and Optics :: 29 Aug 2004 14:13 :: mamali :: Replies: 51 :: Views: 9647
antenna for oem gprs modem
i am building an embedded application using a gprs modem ( gm862).i would like to integrate in a small closed box , both gsm and its bi-band antenna.have you some idea or links concerning small antenna for gsm. informations concerning a dual but sm...
RF, Microwave, Antennas and Optics :: 12 Aug 2004 10:38 :: Element7k :: Replies: 1 :: Views: 309
how do you deal with harmonic problem?
in tx path of gsm system -> matching_gsm(dual band)pa ->fem->antenna connector->matching_a -> matching_dcs if you find out the 2nd harmonice is very bad in gsm band, and you change match...
RF, Microwave, Antennas and Optics :: 07 Aug 2004 20:41 :: vfone :: Replies: 3 :: Views: 534
design of phasing coil for gsm antenna
i am trying to design a passive gsm antenna around 900 mhz (for 833-960 mhz band). what i am trying to do is to stack one 1/4 wavelength monopole (placed at bottom) with another 5/8 wavelength monopole placed on top) with a phasing coil (in shape of ...
RF, Microwave, Antennas and Optics :: 26 May 2004 11:04 :: goxy :: Replies: 6 :: Views: 756
sending gps location data over gsm phone
hello,how can i transfer some data (20bytes) overa gsm telephone? i have a gps receiver and i wanna make a gps locator. ive done it this way: the pic is connected to s25 siemens and to the gps receiver. when phone rings, pic picks up the line, gets d...
Microcontrollers :: 29 Apr 2004 14:19 :: traxonja :: Replies: 20 :: Views: 6609
hi, about harmonic question?
when i added a matching network at dcs band ,the gsm 2nd (about 1.8048g) harmonic get very bad ,very close to the limit -30dbm. but i removed the added the matching , the harmonic getting better about -45dbm ...
RF, Microwave, Antennas and Optics :: 26 Apr 2004 1:43 :: mckinson :: Replies: 8 :: Views: 408
nokia phones with weak signal?
hi. i just wanna ask which part of nokia gsm phone (like 3310) should i have to check if its signal strength is very weak? lets assume that all voltages were all normal. is it at rx or tx side got problem?thanks...
RF, Microwave, Antennas and Optics :: 21 Apr 2004 9:37 :: Leosedf :: Replies: 12 :: Views: 1539
is rfid antenna a big issue?
hi all,i always heard about the rfid tags main components areuchip, antenna, and substrate. is there anything uniquefor the rfid antenna @900mhz? is it so different fromantenna used in 900mhz gsm system? thx...
RF, Microwave, Antennas and Optics :: 19 Apr 2004 8:14 :: riverwalk :: Replies: 0 :: Views: 288
how to improve gsm sensitivity of some channels?
during my gsm handset design, i find some channels(1 to 25) have bad rx sensitivity about -97dbm, but others are normal (-107dbm). what can i do to improve the sensitivity?thanks for help....
RF, Microwave, Antennas and Optics :: 09 Apr 2004 2:10 :: xinxin :: Replies: 9 :: Views: 1143
about harmonic ?help
why the matching of antenna affect the harmonic ?any body can tell me the reason ? best regards !...
RF, Microwave, Antennas and Optics :: 08 Apr 2004 13:59 :: activewei :: Replies: 9 :: Views: 378
a question about matching network between fem and ant,thanks
i want to match an ant to fem , but i don;t know how to choice the matching network , the s11 measured is changing with freq ,and i cant find a network to keep all four freq of gsm and dcs inside the circle of swr<3can you tell me how to design th...
RF, Microwave, Antennas and Optics :: 03 Apr 2004 18:43 :: vfone :: Replies: 1 :: Views: 177
multiband antenna
1.can any one explain to me the chracteristics required to determine a multiband antenna using the s11 graph.2. how to know the impedence of an microstrip antenna if im simulaitng using microwave office?thanks for ur consideration...
RF, Microwave, Antennas and Optics :: 05 Mar 2004 7:34 :: pisoiu :: Replies: 6 :: Views: 1554
how to evaluate a antena for gsm phone?
how to evaluate a antena performances for gsm phone?...
RF, Microwave, Antennas and Optics :: 31 Dec 2003 0:21 :: vfone :: Replies: 3 :: Views: 1179
ask help for gsm rf debug
hello,i measured gsm signal by agilent 8960.in the range of rising edge of a burst, there is a abnormal step not a smooth shap, what will cause the abnormal step? (mismatching, interference or else)and what will cause the orfs dut to switching faild?...
RF, Microwave, Antennas and Optics :: 23 Dec 2003 2:11 :: rhjang :: Replies: 4 :: Views: 895
gprs to gprs
i was just was wondering if it is possible to communicate between two gprs phones without using a mobile phone service provider. i want to have a data-link in a remote area where there is no mobile phone service....
PC Programming and Interfacing :: 09 Dec 2003 16:57 :: artem :: Replies: 4 :: Views: 1262
need recommendation for 2.4ghz wireless camere transmitter..
dear friends. im a newbie in rf design business. now my jos is designing 1000-2400 mhz wireless camera system. i have many experineces at microcontrollers video signals and 433 mhz ism transmitters but still i need advices about 2.4 ghz band. im u...
RF, Microwave, Antennas and Optics :: 26 Nov 2003 8:47 :: Kit-the-great :: Replies: 3 :: Views: 1594
biological hazards of rf radiations
at gsm or wll our skull cavity resonates and at bluetooth frequency our hidogen oxizen bond of water resonates. i thought those mobiles are using microstrip antenna and which may protect our head. now i measured the patten and saw almost omnidirectio...
RF, Microwave, Antennas and Optics :: 03 Nov 2003 9:48 :: mrm :: Replies: 17 :: Views: 1879
req:gsm repeater
hii need gsm repeater schematic and any details for designing it.can you guide me?...
RF, Microwave, Antennas and Optics :: 20 Oct 2003 22:39 :: tapa :: Replies: 1 :: Views: 709
what is wrong with the formula p=ui ?
for a 50ohm rf system with 3.3v dc power.if the output rf power is 1w, we can find output rf voltage isu=(p*r) e 0.5=7vi am confused: the dc power is only 3.3v, how can it offord 7v voltage?...
RF, Microwave, Antennas and Optics :: 01 Sep 2003 1:20 :: defnfo :: Replies: 22 :: Views: 2808
bluetooth rf transceiver and baseband controler borad design
who know which chip should be used to complete a module with above functions ?thx....
RF, Microwave, Antennas and Optics :: 27 Jul 2003 16:48 :: Velund :: Replies: 50 :: Views: 5144
quadband antenna design needed
anyone out there has the design for a single feed quad-band gsm/pcs/bluetooth (2.4/5 ghz) antenna? i found one design on http://www.rangestar.com/pdf/400501.pdf but no antenna geomentry data exist. will appreciate if anyone will tell me where to f...
RF, Microwave, Antennas and Optics :: 29 May 2003 17:21 :: Element7k :: Replies: 0 :: Views: 626
low-voltage low-power rf design: mind struggling!!!!
hi all,the upcoming of very deep submicrometer cmos technologies (0.13, 0.09, 0.065...) make that new systems must be designed for supply voltages smaller that 1.2v.what are the implications on noise, linearity, dr, snr, current consumption of implem...
RF, Microwave, Antennas and Optics :: 15 Jan 2003 7:01 :: riz_aj :: Replies: 18 :: Views: 1817
gsm antenna on pcb
can anybody tell me something about the possiblities to include a gsm antenna on a pcb.any information is welcomehollaender...
RF, Microwave, Antennas and Optics :: 01 Dec 2002 13:52 :: tapa :: Replies: 4 :: Views: 2161
design for a gsm pcb antenna
anyone have a design or link to a gsm pcb aerial....
Professional Hardware and Electronics Design :: 20 May 2002 19:09 :: darksky041257 :: Replies: 5 :: Views: 4247
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