How to calculate distance between antenna and metamaterials ?

Hello every one, I'm working with a bowtie antenna based on metamaterials. How can i calculate the distance between the antenna and the metamaterial unit cells in order to resonate at the...

07 September 2020 1,077 5 View

PTC( positive temperature coefficient) materials , is there any way to cool down faster these materials after curing them?

I need at least an overnight to measure the resistance of a PTC ink after curing it. I am looking for a faster way to have the resistance value.

19 March 2020 9,827 3 View

Is there a database for miRNA of cancers?

I am searching for miRNA database that contains the nucleotide sequences of cancers in the human genome. I have found a database that characterizes the samples by the number of reads_per_millio...

07 March 2019 9,628 3 View

Is there a database for C.elegans RNA?

I wish to locate miRNA in C.elegans based on the signal processing tools; so i have to know the RNA sequences of the entire chromosomes. I would appreciate all the help I can get, thanks.

28 January 2018 9,958 4 View

How to write a custom function for distance for the fitcknn?

Hello, hello , I need a matlab code for using custom function(distance function) for distance parameter with ficknn or classificationknn. In fact i want to define the distance below...

18 May 2017 2,658 1 View

Weighted sum error in discrete adaboost should be small than 0.5 and great than 1

Hi, I'm confused with the condition of the sum eeror for a wek learner. Sometimes i find a condition that err

15 January 2017 1,276 6 View

What is the residence time of dust aerosols over the MENA region (below 1.5km, near surface)?

I am trying to estimate the residence time of dust aerosol over the MENA region. I have tried to compute it using the equation T=fct(radius, normalized_radius,Twet). But, Twet varies with the...

29 November 2015 8,626 5 View

Where can I find a free database for C.elegans nucleosomes?

C.elegans nucleosomes.

16 September 2014 5,655 3 View

I am looking for the global maps of soil clay fraction, soil texture, and soil erodibility?

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12 February 2014 7,248 1 View

I have designed reflectarray element and feeding it though Horn Antenna on HFSS. After full wave simulation, I am not getting desired results?

I have designed reflectarray element to generate OAM beams at 5.8GHz and feeding it though Horn Antenna on HFSS. After full wave simulation, i am not getting desired results i.e Radiation pattern...

01 March 2021 9,701 5 View

Does the circuit modeling for planar monopole antennas using Foster canonical forms give good approximation?

Hi researchers, I am searching for some accurate way to do the circuit modeling of planar CPW-fed monopole antennas. I have gone through the literature where mostly circuit modeling is done using...

28 February 2021 7,016 1 View

Microstrip antenna design tutorial of HFSS 3D layout module ?

I have designed a 24 GHz rectangular antenna on HFSS 3D model and got desired results while desing the same antenna with same dimensions I am getting resonance frequency at 27 GHz I am...

28 February 2021 4,426 2 View

What is Flat Lens Antenna?

28 February 2021 5,433 3 View

Compact antenna for the frequency range 1 MHz-5 MHz?

Hello everybody! I have a problem with developing a compact antenna for the 1MHz-5MHz frequency range. Tell me what type of antenna can be used and what books and articles to read to perform this...

27 February 2021 7,710 4 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

Efficiency of Proximity Feed Patch Antenna ?

Greetings to all of You! I have searched some research papers for the designing of a proximity coupled patch antenna. Researchers are talking about the impedance bandwidth of the antenna but...

24 February 2021 7,662 3 View

2D or 3D phased array antennas??

Dear All, I will start my PhD maybe this year regarding phased array antennas. I'm interested in to find more detailed information about 3D phased array antennas and 2D phased array antennas. Then...

21 February 2021 368 3 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

Is there a way to use waveguide ports for circular antenna design in CST?

Hi, whenever i use circular array i get this error "Waveguide ports must be aligned with Cartesian coordinate planes for the transient solver" Does anyone use circular array with waveguide ports?...

09 February 2021 3,609 8 View