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73 Threads found on edaboard.com: Even And Odd Mode
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 (...)
Hello everyone. I'm writing here, because I need help/sugestions. To the point: I want to simulate structure, which is presented in attachment (picture no_1.png). Most of popular calculators (such as the TXLine, the AppCAD) has solutions for really typical coupled elements (for e.g. coupled striplines). I try to simulate no_1 structure in
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 (...)
Hi How can I calculate even and odd mode velocities in quasi-TEM mode for transmission lines?
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 (...)
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.
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 (...)
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) (...)
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) (...)
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 (...)
Remember the following points 1. The conventional Wilkinson power divider is a narrow band device. So fix your frequency band of operation and try to optimize within those constraints. It would not be fruitful to try for anything over 20% bandwidth of operation. 2. even if you assume no loss in the (...)
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 (...)
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 (...)
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
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
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 (...)
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 (...)
Hello, studying symmetric coupled microstrip lines, we identifiy to modes of propagation (common mode and differential mode). Whereas the even and odd mode impedances, commonly used for microwave design purposes, are defined for half of the structure. (...)
hi forks, does anybody know how to simulate balanced filter using HFSS 12, i.e. how to excite the even mode and the odd mode? Thanks in advances.:roll:
Hello, directivity (coupling minus isolation in dB) of stripline couplers is related to equal phase velocities of the even and odd mode. Normally, the odd mode travels faster than the even mode. Can anybody imagine, why couplers with an (...)