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Hi everyone, I got a problem in understanding the physical concept of electromagnetic mode. Mathematically everything is straightforward, but physically what is the meaning of mode. I mean if you check the system end points there would be energy in input and energy in output so "what is mode?"...

Hi, Can any body tell me why we have TEM mode in a coaxial cable but we can't have it in microstrip transmition line. In another word I want to know what are the physical constraints for TEM mode propagation. Thanks in advance. Amir

Hi, There is a question in my mind that I can't find a good answer for it. I hope you can help me. Is there any relationship between the resonance frequency of an antenna and its radiation efficiency? I mean for example if we have a microstrip antenna not working at its resonance frequency, can...

Hi Everybody, Please help me to solve this problem. I have a loop and I want to show the indicator of the loop as a text in a location of my figure. For example, think that my loop is running from p=1:300. I want to be able to show the number corresponding to "p" in each iteration. I know that...

Hi All, Dose any one of you have any information about the calculation of axial ratio for examining the cicular polarization of antenna pattern. Thanks for your attention.

Hi, I got a problem in VC++. I am trying to run the following program with VC++ but it terminates. The problem is with the size of array. If I change the arraydimension to 50 everything works prefectry but I need to work with large array size. If you have any information regarding this case...

Hi All, Does anybody have any information about Beam-Forming Feed Networks used for phased array antenna? I will be very thankful if you help me. Ragards

Hi All Dose anybody have any idea about microstrip phase shifters. Specifically, about there technology and design. Thanks in advance Mirok

Hi All, I am trying to prepare a survay on microstrip array anttena. I will be very thankfull if you can help me. Any information about books and websites on this category will be helpful. Regards,

Hi All, I need some information about MF/LF antenna. I will be glad if anybody can help me about this topic. Regards

Hi all, I need some information for simulating Q3236 PLL. Is there any available simulator for this IC? At the end I want to design a synthesizer. Thanks in advance for your attention.

Hi, I have a problem in simulating an antenna structure with the aid of Microwave office software. I want to simulate the antenna structure together with all the active components such as a balun and the reciver. thanks in advance for your sugestions. Regars Amir

Hi all I wanna design an antenna with this specifications. Bandwidth:1-4GHz Beamwidth azimuth:40 Deg. Beamwidth elavation:20 Deg. Polarization: circulary Maximum power: 300 Structure: Planar Please help me if you get any idea Tanx in advance

Hi freinds I want to know what is the stability condition in FDTD. I know the courant stability condition, but that may cuase some problems. I want to know what other stabilty conditions we have. tanx in advance Regards

Hi I simulate an inverted patch microstrip antennac using FDTD. the feed structure that I used, was a Gussian Pulse input J-current. Everything is ok. and I almost get good result but the problem is that the real part of input impedance is negative. Can anybody have any comment about that? tanx

hi everybody I have a problem about underestanding E-plane And H-plane definition. I will be grateful If anybody can describe it easier for me or know any website which can be helpful. tanx

hi I want to know what Bragg frequncy is. tanx

Hi I need some information about hemt transistor. How It works and what their applications are? tanx

hi, I wanna know what r the conditions that should be satisfied to have a resonator. tanx Amir

Hi, dose anybody have any information about the theory and application of fiber optics. sincerely yours' mirok