tsa5055
i'm 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.
i'm using PLL satellite tuners for a receiver i designed IF circuit to seperate video and audio and it works very well so i dont have any trouble in my receiver stage. that tuners works in 850-2450 mhz and tsa5055 based local osc and pretty cheap here ( 4S )
my final output power is will be 50mw 100mw level. i need to achieve 300 meter distance in outside and 100 meters in buildings.
1- which type antenna do u recommend to me receiver and transmistter side i'm very confused because the bandwith is very big ? i think to use
1000 - 1600 mhz band to avoid gsm.but bandwith is still 600mhz. is the pcb planar antennas suitable ?
2- which antenna design software and papers do i need to know ?
3- what parameters i need to ask my pcb manufacturer to make rf
calculations in PCB stage ?
4- is the tuners sentivity enaugh this systems or do i need to add another
input stage tuner ?
5- i think to build pll based tansmitter and using tsa5055 because cheap and easy to use is there any fairly cheap ready to use VCO advice.
i have used GSM vco's but they have very limited bandwith as you know :)
6- any advice for power output stage transistor or cheap MMIC ?
Thank you for all answers :)
i hope troubles rf desings all of you :)
cengiz/istanbul
Hi Orpheus !
About the antenna type:
I can suppose, that the log-periodic type antenna or wideband fractal dipole ( http://www.fractenna.com ) can be suitable for You, but it depends on polarization type.
About the software:
Sonnet, Genesys or MWO for simple cases, CST-MWS, IE3D and FemLab for most complex antennas.
About the papers:
C.A. Balanis, Antenna Theory: analysis and design.
Microstrip antenna design handbook by R. Garg and A. Ittipiboon.
Check the Sirenza Microdevices - it must be a cost-effective and good enough.
Best regards,
Kit-the-great
Hi,
3. you have to know substrate thickness, metal thickness, relative dielectric constant,loss tangent of dielectric
4. what are the tuner parameters (sensitivity)?
5. you can use some ready made vco's for example mInicircuits, ZComm, Synergy, and many others. But as I know, some companies are producing the transmitters for the wireless cameras too.These transmitter modules (what I use) has typical output level of 5 dBm, and the receiver has a sensitivity of -80 dBm (and they are cheap too)
6.I use some power amplifiers from RFMD (RF2126, P1dB 1W, it is for 2.45 GHz). You can calculate for your app what power/output stage gain you will need. You will have a loss about 93-96 dB at 2.4 GHz. Of course there are many other manufacturers.
Best regards, Al
Some additional words about substrate:
You must know the relative dielectric constant non-homogeneity and statistical deviation of Er for yield analysis (if necessary).
Best regards,
Kit-the-great