gsm and antenna and pcb - results edaboard.com

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: 807

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

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

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

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

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

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

discussion about setup for antenna rl and gain measurement

hi guys,im searching for someone that can once and for all give me the right way to measure antenna rl and gain. now...im not interested in the method...i know it but the correct setup. i mean..when i want to measure rl of a small antenna, take as an...
RF, Microwave, Antennas and Optics :: 31 Aug 2007 15:44 :: jallem :: Replies: 3 :: Views: 297

gsm in-band spurious induced by flex pcb

hi all,i met a issue with ?inband spurios around 500~700mhz wideband noise coming up. its for sure is flex pcb that connect to main pcb make it instead any other radio module/pa/rf driver issue.could anybody giveme a guide how to trace it or if neces...
RF, Microwave, Antennas and Optics :: 29 Jun 2007 1:29 :: RFDave :: Replies: 2 :: Views: 195

double the frequency of an antenna.

hello.i know nothing about antennas, nothing at all.my problem is that i am designing a gsm system with a very small antenna, this antenna requires a pcb pad that has 50 ohm impedance (did i say that correct?).this antenna is for the a range of 880 -...
RF, Microwave, Antennas and Optics :: 10 May 2007 13:16 :: Virus King :: Replies: 2 :: Views: 429

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

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

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

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

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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: 5138

simple gsm antenna on pcb

hi,i need to know if it is possible to build a simple antenna for gsm (900 mhz) on a 0.8mm thick fr4 pcb.if not, is there any other simple solution to build an antenna using a piece of wire (folded or bent in some way), for the gsm 900 band ?i need t...
Professional Hardware and Electronics Design :: 20 Apr 2002 2:35 :: yellowtooth :: Replies: 11 :: Views: 1898

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