What is Flat Lens Antenna?

28 February 2021 5,433 3 View

Can impedance of antenna be less than 50 ohms?

I am simulating helix antenna in hfss, right now, giving excitation with 50 ohms port. When I see the results of Z parameter (real). It shows lower than 50 ohms. Do not understand, if it can be...

27 February 2021 4,218 7 View

Helix antenna coupling problem?

Dealing with a helix antenna, made with flexible material and not rigid like using a PCB board or wire. At the beginning of the helix is too close to the ground plane, causing coupling. How can I...

21 February 2021 4,453 3 View

Design parameters of L1 frequency Helix antenna?

Could I please get the guidance on Helix antenna operated from 1.5 - 1.8 GHz. I am designing in hfss and not able to cover 1.5 GHz. Could I get papers or suggestions on numbers I use to cover this...

02 February 2021 622 7 View

Should I make 2 helical antennas? One for 2.4 GHz and another for 5.8 GHz?

Should I make 2 antennas, one for 2.4 GHz and one for 5.8 GHz? How should I approach the problem if I want to design the antennas which cover 400 and 900 MHz and 2.4 and 5.8 GHz? All together in...

26 January 2021 906 3 View

VSWR is shooting to 2.1 or even 2.3 in UHF dipole antenna, why?

So, I have a design, two dipoles working at UHF and VHF. We fed using a diplexer. I am having difficulties with the testing using network analyzer. VHF passes but UHF, specially at 400 MHZ, the...

26 January 2021 8,743 8 View

Can I simulate Ferrite in HFSS?

I have a design with 2 dipoles working at different frequencies joined in one system and separated by Ferrite. I think, Ferrite was used to minimize the interference between 2 antennas as much as...

25 January 2021 5,918 3 View

How to dissolve L-tryptophan in PBS?

The solubility of L-tryptophan is 11.4g/l in water. I tried dissolving 1.14 g in 100 ml PBS but still, it's not fully dissolved. Should I add NaOH or HCl? Also, can we stir the solution, or...

22 January 2021 1,127 3 View

Testing of Antennas?

So, I came across, where antennas are being tested in a building ( a plant), where all sorts of big equipment are around and of course the ceiling. lot of multipath which can affect the...

21 January 2021 9,437 3 View

Why do we vary the spacing between helical coils?

Helical antenna usually have fixed spacing between the coils. What is the advantage of varying the spacing between the helical antennas? Varying the pitch angle. Thank you for your guidance in...

21 January 2021 8,864 4 View

Which vial septa the right one to be used for HPLC?

This is the unanswered question stored very long in my mind and till now I could not find a right answer. Google search educated me that the red surface is the PTFE material compatible to wider...

21 February 2021 546 3 View

I have faced a problem to amplify VP2 gene of porcine parvovirus 1,2,3 and 5? Please suggest me how can i solve this problem?

Till now i haven't got any PCR amplified vp2 gene bands on specific annealing temperature and in step up PCR.

08 February 2021 819 4 View

How to resolve a corrupted .odb file?

Hello. I run my Abaqus simulation in the supercomputer and once it's done, I copied the result (odb file) into my local computer using winSCP. But I faced a problem to read that file (see...

08 February 2021 6,198 3 View

How to compile UDF for parallel processing ?

I am trying to use a UDF for velocity input in the room from a fan. I have created a UDF but when I am trying to load the UDF it shows an error stating that it is not compiled for parallel...

03 February 2021 2,187 3 View

Anyone knows about how to stop pH getting acidic after 7 days formulating the formulation?

i am trying to formulating one formulation but the problem i am facing is after formulating and adjusting it's pH, when i try to check pH after 7 days it is getting down towards the acidic side....

02 February 2021 9,343 3 View

How to analyse multiple Likert scales?

Hello everyone! I've encountered a problem when trying to figure out the methodology of my dissertation. The study has multiple variables and will be, in general, rather complicated, but my only...

02 February 2021 2,086 3 View

How seniors face covid 19 without fear?

Seniors in the world with diabetics and hypertension and heart diseases are millions ,and they are facing covid.therefore we should give them advices and precausions to face covid 19,this...

26 January 2021 8,349 4 View

What is the largest disadvantage in using of face masks at present? What would you like to be improved?

We all use face masks many hours a day. I wonder what are your items you like to be improved. We have the opportunity to write an application for support to a sponsor. Your answers will help us a...

18 January 2021 1,311 4 View

Will it be ethically appropriate to demand increased patient responsibility for own health?

The health care system is facing challenges when more individuals are not taking responsibility over their own health care decisions and actions. This is evident in narratives where patient...

16 January 2021 7,760 13 View

Why does the DNA's elution decrease after centrifuging with spin column?

02 January 2021 987 4 View