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

How do i calculate the mean of patient age represented by year + months?

Dear all , I'm doing a pediatric study and the majority of sample's ages are repressented by year + months such as 6Y+4M. How can enter the data and calculate the mean in SPSS? Thank you for...

01 February 2021 570 10 View

What is the recommended age limit for primary posterior capsulotomy in pediatric cataract surgery?

In our centre, we are doing PPC even for older children upto 10-12 years of age and there seem to be no harm, rather beneficial and good outcomes. Please share your experiences.

27 December 2020 4,268 6 View

Auricular chondritis with cervical lymphadenopathy of left side in a 20 year old lady can we start anti-TB drugs?

10 December 2020 4,253 3 View

Assessment of T-cells in the surgically removed Skin tissue ?

How can we assess the presence and amount of T-cells in the freshly removed skin tissue after surgery or punch biopsy? Also, if we freeze the skin tissue at -20C for a long time, after thawing to...

10 July 2020 5,208 4 View

What are the explanations for asymptomatic CoV-19 infection in the pediatric age group?

1) Is the pediatric age group (

25 June 2020 4,054 2 View

Reasons for Covid-19 false positives in pediatric cancer?

Hello, Any idea why false positives appear in children with cancer (neuroblastoma, osteosarcoma, etc) under chemotherapy? Rapid tests result positive but PCR results negative. Thanks,

17 June 2020 3,277 3 View

Does eosin stains collagen in IHCs in typical H&E staining?

Hi all, Does eosin stains collagen in IHCs in typical H&E staining? Please share your thoughts below as comments. Please add a reference if possible (much appreciated). Best, J.

22 May 2020 8,178 2 View

What is your opinion on role of BCG vaccine in COVID-19?

BCG vaccine is being seen as a new hope for COVID-19 patients. It can make our immune system to recognize and respond to a variety of infections, including viruses, bacteria and parasites etc...

27 April 2020 7,728 30 View

can I have a list of Indian indexed journals in pediatrics ?

Besides IP and IJP, which other indexed pediatric journals are there?

06 April 2020 8,132 2 View

How common is to find supratentorial gangliocytoma in tuberous sclerosis as a cause of refractory epilepsy?

case report: pediatric 4 months old multiple tumors in heart refractory epilepsy since day one multiple T2 lesions on brain surgery of biggest one: parietal histophatology: gangliocytoma

30 March 2020 2,224 3 View