Antennas

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Questions related to Antennas

What size should the air box be?

I simulated the coupling between the patch antenna arrays, and I found that the coupling varies when i change the height of the air box. the difference at most by 5dB. the height of airbox change...

03 November 2022 5,219 4 View

Nonconvex constrained optimization solver?

Dear All, I want to to solve a problem which has the following form min f(x) (f is a convex function) x=[x1,x2,x3,......] s.t. Ax

02 November 2022 4,426 5 View

What is the following type of microstrip filter called, and how can it be calculated?

Greetings, I am trying to create a microstrip filter and came across and online filter designing software (https://rf-tools.com/microstrip/). Does anyone know what this particular filter design...

31 October 2022 592 2 View

How to model bottom of Gold surface in optical absorbers?

Generally optical absorbers exploit a relatively thick metallic plate to ensure zero transmission via the structure. Also some parts of absorbers are modeled by circuit elements helping...

24 October 2022 7,407 1 View

How to understand the power-stimulated spectrum for non-default signals in CST?

As per my understanding if we choose the default excitation signal in CST to excite an antenna/structure, the power stimulated spectrum is the normalized one at .5W through out the band. Default...

21 October 2022 4,729 2 View

Can I receive +20dBm FSK-2 signal from 500km away?

I am studying cubesat communication system. (RF noise floor is -90dBm in my receiver location) Please let me know how can I evaluate it.

20 October 2022 677 3 View

What s the thermal and dielectric properties of gold nanoparticles at 2.45 GHz?

i need to use gold as nanoparticle to enhance hyperthermia but i can't find its thermal & electrical properties.

13 September 2022 4,223 0 View

Where can I buy dummy chips for self-made gas sensors?

Dear Colleagues, I am working with gas sensing nanomaterials now and frequently see that many authors utilize 6-pin chips with steel mesh cover to fabricate the prototype gas sensors. The chips...

03 September 2022 1,378 2 View

HFSS obtain mesh problem?

I am HFSS beginner. After I draw S parameter plot, I want to draw E-field. This error keeps showing up. [error] failed to obtain mesh size for ansys electronics desktop student mesh limit...

03 September 2022 335 2 View

Multiplexing efficiency of MIMO Antennas?

Am working on a two-element MIMO antenna, I extracted the multiplexing efficiency of my proposed antenna the result I have, is doubting because the values of the efficiency am getting is negative...

24 August 2022 3,201 4 View

Why has the delay of a wave in a transmission line in CST MICROWAVE STUDIO become wrong?

I am working on transmission lines, so i decided to simulate the real delay of electromagnetic waves in a cylindrical transmission line. base on my calculations and formulas, the delay of a...

23 August 2022 8,587 4 View

What’s the difference between the channel estimation and prediction in cell-free massive MIMO?

According to my knowledge, the channel estimation is to analyze the channel realization based on the pilot signal, and the channel prediction is to obtain it based on past channel realizations....

19 July 2022 7,792 3 View

How i can maximize SAR at tumor location?

i designed a circular array patch antenna around a breast model and i need to make SAR maximum at tumor locations but there is no hot spot neither in model nor at tumor location how i can fix this ?

06 July 2022 8,161 3 View

How to design a varactor diode in HFSS?

In order to design a reconfigurable unit cell at 28 GHz using a varactor diode, I searched the data sheet to know the values of the lumped elements, i.e., R and L. However, the data sheet is...

30 June 2022 1,745 1 View

How to plot Beam width and the range in HFSS?

I have a circular polarized antenna simulated in HFSS and need to plot the beam width and the range as per the image in the attached file. Can anyone please explain hoe to do it in ANSYS HFSS....

22 June 2022 1,851 0 View

How to identify S21 values in unit cell analysis from CST studio?

how to identify S21 and S11 values in unit cell analysis from CST studio {SZmax(1),Zmax(1)}=? {SZmax(2),Zmax(1)}=? {SZmin(1),Zmax(1)}=? {SZmin(2),Zmax(1)}=? {SZmax(1),Zmax(2)}=? {SZmax(2),Zmax(2)}=?

18 June 2022 1,899 0 View

Comsol Convergence issue-Semiconductor Module?

Hello people, I am seeing this weird behavior while running a simulation, any idea how to fix it?

15 June 2022 4,052 0 View

How can I Set TE/TM mode in CST ?

Hello everybody, I try to be clear for what I am looking for. I would like to set TE and TM mode varying the angle of incidence. I know that varying teta I could modify incidence angle, and it is...

01 June 2022 9,931 1 View

How to calculate rotation angle of the user's antenna array with respect to moving direction?

I have read in a paper that a variable 'x' is the rotation angle of the user's antenna array with respect to moving direction. I am wondering how can we calculate this variable x? Following...

30 May 2022 4,953 4 View

How to implement taylor distribution while designing antenna array?

I want to design an antenna array at 77 GHz. In order to reduce side lobe levels, taylor distribution needs to be implemented. How to change the widths of each element according to the...

20 April 2022 7,528 2 View

How to solve this CST error?

I am currently designing a 10 loop antenna (110Mhz) (radius of the wire /1.4mm height of the coil 3cm /radius of the loop 4.5cm) after running the simulation I got this error: The mesh near the...

13 April 2022 1,427 0 View

How to get other far-field and s-parameters plot in CST Software?

Hi I am trying to look into the results of S-parameters and far-field pattern. I am getting only s1,1 and abs plot in far-field But I am supposed to get all s(11;12;13;14) parameters and...

03 April 2022 1,887 4 View

How can I obtain the input power (Pin) of a metasurface using the Poynting vector?

Hello everyone. I want to determine the simulated RF energy harvesting efficiency of a 5x5 unit cell metasurface, using this equation; ----------- Efficiency (n) = Pd/Pin The metasurface RF...

13 March 2022 6,138 2 View

How to assign incident wave angle in case of metamaterial structures using floquet port and master slave boundary conditionsin HFSS?

1)I am trying to simulate METAMATERAIL absorber in HFSS I want to see the polarization and its mode as TE, TM 2)EFFECT OF DIFFERENT INCIDENT ANGLE ON S11 IN TE,TM MODE using master slave...

22 February 2022 7,243 4 View

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