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1. Annular ring antenna design equations

annular ring antenna Hi ! I'd like to design an annular ring slot antenna for 2.4 GHz. Could someone kindly point me out in the right direction as to how to design one (inner and outer radius specification etc) for a given substrate of dielectric constant er and thickness. I have tried to...
2. Annular Ring Patch antenna Basic deign concept

patch antenna basics Who can share Basic deign concept of Annular Ring Patch antenna For example. the relationship between rad/ centre freq
3. What is the concept of Compact microstrip resonant cell-CMRC

What is the concept of Compact microstrip resonant cell-CMRC? Why it can employ to design for size reduction???

Mepg coding...Help Any one can help me....??
5. Using fourier and laplace transform to solve PDE

PDE is type of heat equation. Where have above reference notes? Many book only gives an example of solving heat equation using fourier transform. An exercise asks me to solve it for using fourier and laplace transform: In the heat equation, we'd take the fourier transform with respect to x...
6. Fourier transform convolution Question! Please

Given F[f(t)*g(t)] = F(ω)G(ω) , where * = convolution F(f(t)) = F(ω) ; F(g(t)) =G(ω) How to prove F[f(t)g(t)] = 1/2pi [ F(w)*G(w)] I have to do - F^-1(F(ω)) = 1/2pi ∫F(ω)e^iωt dω = f(t) F^-1(G(ω)) = 1/2pi ∫G(ω)e^iωt dω = g(t) F[f(t)g(t)] = F[F^-1(F(ω))F^-1(G(ω))] =...
7. How can I use n- enhancement MOSFET as a switch??? (THANKS)

Please look at the circuit How can I use HIGH/ LOW to control the MOSFET to ON/OFF?? i.e 1)If Gate >5V.........the path between drain and source = close circuit the load is come to vdd 2)If Gate =0V.........the path between drain and source = open circuit Thanks

a, b,h is constant how to solve it? thx??

disadvantage of vlsi What is the advantage and disadvantage of implementing VLSI using deep submicron MOS device?? thank
10. What is the operation principle of ROM, SRAM and DRAM cell?

thanks................
11. what is the Boolean Equation of 2bit full adder???

input A0 A1 B0 B1 Cin output Sum0 Sum1 Cout.... Thx a lot

13. What is the impact on the static transfer characteristics...

What is the impact on the static transfer characteristics reducing the power supply from 5V to 3V of i) NMOS and ii) CMOS gates Thanks
14. Something about Digital to Analog Converter

I am used a AD5678 -2 (16 bit 2.5V internal Ref) DAC http://www.analog.com/UploadedFiles/Data_Sheets/102142943AD5678_a.pdf **broken link removed** When I put all 0 in the DAC...It still occurs 0.002V How can I reduce the output noise and solve the zero code error??? Please give a...
15. +/-15V power supply using LM317 and LM337 regulator ICs

15v power supply **broken link removed** How to make a +/-15V power supply using LM317 and LM337 regulator ICs. Thx The voltage is used to DAC (AD669) THX
16. About Visual Basic6 and RS232 ASCII communication

About Visual Basic6 and RS232 ASCII communication **broken link removed** If I want to send the value (ASCII) to 8051 series port VB block input: 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.1 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 . . . . . . . 29.93 29.94 29.95 29.96 29.97 29.98 29.99...
17. D to A covertor reference

D to A covertor reference Any High Precision +-10 V Reference?? AD688 is too expensive...any other cheaper??
18. 0-10Vref DAC controlled voltage&current regulator 0-30V

dac-controlled regulator anyone have some information about DAC controlled linear voltage & current regualtor??? My current circuit uses the LM358 with 0-10V DAC controlled but it is too simple...... the output is not linear and very not stable..... and connect the load...the output will drop...
19. Why I can't open the sc.lbr and borad on other PC?

**broken link removed** why i can't open the sc,lbr and borad in other PC??