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94 Threads found on edaboard.com: Odd Mode

Typical differential input impedance for IC

You have to understand mode decomposition, even(=differential) and odd(=single-ended). If you consider only even mode, signal source impedance should be 25ohm as singled-ended, this is equivalent to floating source impedence of 50ohm as far as concering even mode. These concepts are linear, so it is not difficult to (...)

Odd/even impedances simulation for a not typical structure

Hi Eres_89, You mentioned that you have calculated values for Zoo and Zoe. How did you determine the modes ? For example, for odd mode: You have fields coupling between the top two traces. Similarly,for the bottom traces - Fields going from the center signal line to near by grounds. What about even modes ? If you know (...)

Characteristic Impedance of Differential Transmission Line

Differential Transmission Lines have 2 impedances.Even mode and odd mode.The characteristic impedance of a differential lines is composed of these two mode dependent characteristic impedances.For more information, "RF and Microwave Coupled-Line Circuits", Inder Bahl, Prakash Bhartia,Rajesh Mongia. Artech House

Even and Odd mode velocities in quasi-TEM

Hi How can I calculate even and odd mode velocities in quasi-TEM mode for transmission lines?

Interdigital Bandpass Filter - Design procedure (Lancaster)

Hello, I am following the design example of an interdigital filter with symmetric coupled lines as given in Microstrip Filters for RF-Microwave Applications (Lancaster), page 141. I managed to calculate the characteristic impedances in even and odd-mode and, consequently, the coupling coefficients. My struggle is to calculate the spacing betwee

Question about Momentum port setup for a transmission line simulation

You don't have to add P2,P3,P4 since you have a GND layer.P1 and ta the other side another Port let say P2 will be good enough. Differential odd mode port configuration is only used when the GND layer is not present so RF return path is maintaned by side layer only.( Exiting + and - Ports are odd mode)It's generally used in (...)

Regarding pwm in atmega8

I have an odd problem the value of OCR1A is automatically taken as 0x3FF, below is my code int main(void) { // PB1(OC1A) is now an output DDRB |= (1 << DDB1); // set PWM for 50% duty cycle ((65536/2) - 1 ) OCR1A = 0x7fff; // set none-inverting mode TCCR1A = (1 << COM1A1); // Fast

input impedance of coupled line

Input impedance is function of odd and Even mode impedances of coupled lines.Therefore you should find these impedances first by calculating or simulating. You can read something about those in Bahrtia's book.

HFSS directional coupler

Hello, I need some help in design a directional coupler, I got the results in MWO but they does not match in HFSS, any one know or have a file about special condition to design Directional coupler coupled line in HFSS please help and I know to see the even and odd mode but I don't know how or calculate the even and odd impedance

Uart serial communication 9600n71

I have to receive data from a Device through RS232 using 9600 Baud, NO parity,7 Data bits and 1 Stop bit. The Device is Pre programmed to select different Baud rate, odd/EVEN/ NO Parity, 7/8 Data bits and Fixed Stop bit as 1. My project uses 89C52 controller and setting the serial port (SCON) mode to 1 (9bit) I am able to receive the data with

Uart serial communication 9600n71

I have to receive data from a Device through RS232 using 9600 Baud, NO parity,7 Data bits and 1 Stop bit. The Device is Pre programmed to select different Baud rate, odd/EVEN/ NO Parity, 7/8 Data bits and Fixed Stop bit as 1. My project uses 89C52 controller and setting the serial port (SCON) mode to 1 (9bit) I am able to receive the data with

Microstrip Coupled line impedance matching

Your calculations is not exactly correct.odd and Even mode impedances are valid only and only if there are 2 coupled lines.But if there are more than 2 coupled lines like in your filter structure , it's hard to say that formulae will still be valid in any case.You forget other interactions between-for instance- first element and kth element.

Even and Odd-mode Wilkinson power divider

Hello, My task is to calculate all the impedances of a 1-4 Wilkinson power divider by using the even and odd-mode method. I'm not quiet sure how to do that,so could anyone help me with that?

Ring resonator with gap / varactor. How to tune second mode?

I can't understand how to use varactor for tuning ring resonator. First, there is a ring with all resonances: n=1,2,3,... Then, we add a gap, and odd modes dissapear, so we have n=2,4,8,... And the last, we add varactor, and what happens? We need a second gap to maintain biasing. As i do not want second gap, we can put varactors in (anti)series

How a branch line coupler physically works?

Hi I am unable to understand how a branch line coupler works physically. By scattering matrix or even-odd mode it seems ok, but any physical explanation?? I got some explanation as follows: If port 4 is terminated the port 1 will be matched and the power equally divided between port 2 and 3 because both have same impedance Z0. and phase differenc

"Rat-Race" and Wilkinson combiners question.

Hi Darktrax, Yes. The two signals must be in phase in order to add into the in-phase port, or in counterphase in order to add into the other port. If the two voltages are V1 and V2, the outputs at the two ports are (V1+V2)/sqrt(2) and (V1-V2)/sqrt(2) (even- and odd-mode respectively), when "+" and "-" are vector operators. Regards Z

Even- and odd-mode characteristic impedance design data for symmetric coupled...

Hi there I need even- and odd-mode characteristic impedance design data for symmetric coupled microstrip lines on a substrate with various Er. I found a design graph in Pozar's Microwave Engineering book, but it's for Er=10, I need design data for instance Er=4.6. Where can I find sth like this, can anybody help me? thx

Microstrip lines filter

Hi U need to calculate the even and odd mode impedance of each coupled line. You can then use the ADS LineCalc tool for getting the gap, length and width. Regards Twisha

Even-Odd-Analysis Coupling Structure

Hello everyone, I might need your help!! I have a touchstone file (s4p, S-Paramter) describing a coupling structure including two 'transmission lines'. Now I want to make an eve-odd-analysis using a circuit simulator (ADS). Do you know how to find out the even/odd impedance and the characteristic impedance matrix for the entire structure? The c

Coupling in multilayer microstrip

Hello, I have question about coupling in multilayer microstrip. I've read some books about coupling that include extraction of capacitance for even-mode and odd-mode (The basic theory with mutual and self capacitance!!). Also i've read about ''broadside-cupled lines'' (from ''RF and Microwave coupled line cicuits''), so i have some (...)