Hassan Sajjad

13 Questions 24 Answers 0 Followers

Questions related from Hassan Sajjad

Which simulation softwares can be used for designing a traveling wave tube?

Can anybody guide me towards a simulation software that can be used for designing traveling wave tubes? Any views about COMSOL multiphysics?

12 December 2017 10,015 2 View

How can I measure voltage at the port of an antenna in HFSS?

I have a plane wave incident on a horn antenna and would like to measure the voltage at the port of the antenna? How do I go about it? Waiting for some input.. Regards,

04 April 2017 6,086 9 View

What is optimum height and width of a rectangular port in HFSS?

Hello, I have a confusion with assigning a port in HFSS. What should be the height and width of the port for printed antennas, lets say a patch antenna or any other antenna. When I keep the width...

03 March 2017 4,324 4 View

How do I design phase shift array using circuit elements to control the pahse shifts?

I am interested in designing a beam steering planar array and would like to know a few techniques to introduce phase difference. I know a transmission line of different lengths could be used to...

06 June 2016 4,829 6 View

How can electromagnetic band gaps (EBG) be used efficiently for patch antennas?

I am working on patch antenna analysis using FDTD. I need to design a two element rectangular patch antenna array and would like to reduce the coupling between the two which would in turn improve...

05 May 2016 1,823 5 View

How to use "Activate slit condition on interrior port" in COMSOL??

I am designing a simple pyramidal horn antenna in COMSOL without using symmetry planes. When I try to excite it using a rectangular port it says I need to activate the slit condition. I am not...

02 February 2016 1,901 1 View

How do I set up free convection in comsol?

I want to see the effect of free convection on a patch of water enclosed inside a solid (Calcite) when it is heated by a dipole antenna. Currently, I am simulating the antenna in a separate study...

11 November 2015 5,852 2 View

How do I find 3dB bandwidth in COMSOL?

Hello, I have simulated an antenna in COMSOL. I got the radiation pattern and now I am interested in finding the 3dB beam width of the radiation pattern. Any suggestions? If it is not clear from...

09 September 2015 9,760 2 View

How do I model conduction and convection in heat transfer in solids interface?

I am trying to model heat flow in a material using the Heat Transfer in Solids interface of COMSOL (5.1). I would like to include conduction and convection as well. Guidance needed for a new...

09 September 2015 1,397 5 View

How to solve Convergence error due to singularity in COMSOL?

I am trying to model heat flow in a solid material. I am using periodic ON/OFF of the Electromagnetic source (Antenna), via a rectangular pulse. The pulse is ON for 12 hours and OFF for 12 hours,...

09 September 2015 9,697 0 View

How can we select boundaries, edges, domains in COMSOL?

I am new to COMSOL and I would like to know how to find out the number of boundaries, edges and domains? How does COMSOL assign the numbering. For example, if I want to assign a material to my...

08 August 2015 5,872 2 View

Which microwave simulation tool should I use?

I have to model a dipole antenna (2.4GHz) and then see the power transmitted by that antenna when it is inserted about 1000 meters down a hole. I would like to know the Specific Absorption Rate...

06 June 2015 3,438 7 View

Specific Absorption Rate (SAR), how to calculate?

Has anyone worked on SAR? How do we calculate it? Any good literature that you could refer? Thanks.

06 June 2015 8,689 1 View