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 to arrange coordinates and extract climate dataset out of MPI-ESM-MR netcdf files?

Have a nice day everyone, I'm stuck in extracting datasets out of MPI-ESM-MR netcdf files because the latitude ranges from -3*10^6 to 3*10^6 and longitude ranges -5,9*10^6 to 5,9*10^6. Plus, the...

28 February 2021 912 3 View

How can I convert netcdf file to a binary file in matlab?

Dear all, I have monthly nutrients data from WOA (in a separate NetCDF file) extracted for a specific region. I would like to convert these data directly into a bin file (one of the separate...

30 January 2021 9,241 2 View

Can I use MERRA-2 model's "500hpa geopotential height" monthly data in excel form for districts or I download the data in netcdf files and extract it?

I want to use MERRA-2 model's monthly data of 500hpa geopotential height for different districts of Pakistan (1980-2019). I want to download this data from NASA Giovanni and I want to select time...

25 January 2021 6,144 1 View

Could anyone help me with this error Exception has occurred: ValueError?

I have downloaded monthly mean wind speed of terraclimate data for 20 years (2000-2019) which have NetCDF format, but unfortunately, each year has a single NetCDF file, and I want to merge them...

25 November 2020 8,477 2 View

How do I extract values from polygons or points from a NetCDF layer file for specific geographical locations at specific points in time?

I have a NetCDF layer file with monthly SPEI-6 values between the years 1950 and 2020 from Global Drought Monitor, a shapefile with polygons of geographical areas that I want to use for extracting...

16 November 2020 2,739 7 View

Averaging time slices of NetCDF file in R or ArcMap 10.7.1?

Hi, I have downloaded a NetCDF file from https://psl.noaa.gov/data/gridded/data.gpcp.html which shows mean monthly precipitation between 1979-2020. I think there are around 501 time slices in...

14 November 2020 3,554 3 View

Data.CDF format is centroided when I use Waters Masslynx (Databridge) ?

Hello, I convert data from LCMS (Water UNIFI) with Waters Masslynx (Databridge) to netCDF in order to import into MZMINE 2. My question is : when I convert the data with a netCDF export tool,...

20 October 2020 8,827 3 View

Can one plot a map using Basemap toolkit in python for a csv dataframe with columns Latitude/Longitude/TIme and variable?

I have downloaded Sentinel 5p TROPOMI data sets and managed to Process the netCDF file in R subsetting the data for the desired region and Quality values. Can anyone suggest a way to map the data...

01 June 2020 1,679 2 View

Is there a way to correlate one-dimensional netcdf data (like a time-series data) with the spatial gridded dataset (which is multi-dimensional)?

For eg. I have a netcdf file which is in the form of a time-series and the other data is a gridded .nc file for geopotential height. I want to correlate both of these datasets. Please guide me...

27 May 2020 8,133 3 View

How to do regridding using MATLAB?

I have a batch of netCDF files of precipitation data at 30km * 30km resolution. I attached a sample file of it. I want to convert them to 10km * 10km resolution using MATLAB. I tried using...

12 May 2020 6,007 6 View