Fraser Cripps

9 Questions 12 Answers 0 Followers

Questions related from Fraser Cripps

Varactor diode with very low junction capacitance, does anyone know a manufacturer who makes them?

Hi, For a project I'm working on, I require an X band varactor, with a junction capacitance of the order of 0.1pF. I am struggling to find a varactor (surface mounted, SC-79 packaging) with...

07 July 2019 5,650 6 View

Comsol, frequency domain, circuit model of RLC circuit not quite right?

Hi all, I am using the circuit physics in comsol 5.1 as part of a complicated model, but to double check I understand what the circuit physics is doing, I decided to simulate a very simple RLC...

09 September 2018 3,334 5 View

Nonlinear optics simulation, is this process correct?

Hi, I am attempting to simulate in comsol a nonlinear metamaterial (which by using effective media theory I can approximate as a periodic slab of artificial material). My process is as...

05 May 2018 6,063 2 View

Can comsol simulate a wave propagating around a scatterer, when that scatterer has a circuit component attached to it?

Hi, I'm attempting to simulate a wave propagating through a metamaterial, with the added difficulty of an circuit component attached to the meta atom. The first part, wave propagation through...

05 May 2018 7,661 0 View

Comsol simulation connecting circuit to frequency domain em wave physics, equations not converging?

Hi, I'm trying to couple electrical circuit physics with frequency domain em wave. In my simulation a wave of some frequency propagates through a split ring meta atom. I have set lumped ports...

05 May 2018 5,191 5 View

Predicting nonlinear response of metamaterial, is there an expression for a varactor diodes permittivity that I can use in a comsol sim?

Hi, I'm looking to predict via simulations and maths a nonlinear response from a square split ring meta atom to see if inserting a varactor across a split gap significantly changes the behaviour...

04 April 2018 9,247 2 View

Design of metamaterial pcb?

Hi, I'm looking to draw copper tracks on a double sided substrate within a software that allows me to export as dxf/dwg/gerber for fabrication. Can anyone recommend a pcb design software that...

03 March 2018 875 7 View

What is the best way to measure frequency in/frequency out in comsol?

Hi, I'm attempting to create nonlinear metamaterial structures in comsol and I don't know how to measure second harmonic generation. How do I measure that frequency x goes into structure and...

12 December 2017 4,970 4 View

Can any experienced comsol users help me understand usage and difference between eigenfrequency solver and frequency domain modal solver?

Hi, I'm hoping to simulate nonlinear metamaterials in comsol 5.1 and I would like to be able to see the frequency of the em waves leaving my metamaterial. I have looked online for tutorials...

12 December 2017 10,003 3 View