Downloads – rfsims

X-Band Cross-Guide Directional Coupler – HFSS Design

rfsims — Tue, 17 Aug 2021 14:25:31 +0000

This item is a parametric model of a cross-guide directional coupler in ANSYS HFSS. The structure is simulated within the frequency 9GHz~11GHz. Both waveguides are WR-90. The return loss of the ports is better than -30dB and the coupling factor is around 20dB. The directivity of the coupler is better than 25dB at 10GHz.

Flat Multilayer Structure Simulator (FMSS)

rfsims — Sat, 03 Apr 2021 07:55:20 +0000

Flat Multi-layer Structure Simulator (FMSS) is a software for calculation of reflection and transmission coefficients of a plane wave incident on a flat multilayered structure. The reflection and transmission coefficients are plotted in terms of frequency in the range specified by the user.

The material of each layer in the stack-up can be selected among the materials which have been defined in the software. The software has a library including a few common materials but the user can also define new materials and assign them to layers. The user can save the defined materials as well as the stack-up and load them again to use.

FMSS can be used in different parts of electromagnetic spectrum. In Radio Frequency (RF), FMSS can be used for the following applications:

Calculation of transmission loss for estimating the electromagnetic performance of radomes including single layer and sandwich radomes
Calculation of return loss for estimating the electormagnetic performance of absorbers and reduction of Radar Cross Section (RCS)

In optical frequencies, FMSS can be used for estimation of reflectance and transmittance of thin films and multilayered structures e.g. dielectric mirrors.

It is noted that FMSS assumes:

All the incident, reflected, and transmitted rays are electromagnetic uniform plane waves.
All the layers are flat and have infinite dimensions.
The materials of layers are simple, i.e. electromagnetic properties of materials are isotropic, linear, non-dispersive, and homogeneous.

1030/1090 MHz Diplexer – HFSS Design

rfsims — Thu, 31 Dec 2020 12:12:10 +0000

This component is a 1030MHz/1090MHz diplexer, i.e. splits incoming signals from a common port into two channels, dependent on frequency (1030MHz or 1090MHz). Each 1030Mhz/1090Mhz channel consists of a cavity filter of fourth order.

Narrowband Filter 20MHz Bandwidth at 1090MHz – HFSS Design

admin — Mon, 14 Dec 2020 07:21:02 +0000

This item includes two designs of a narrowband filter with 20MHz bandwidth at 1090MHz in ANSYS HFSS. The inputs are 50Ω SMA connectors. The order of the filters is four.

The design 02 has a transmission zero at 1090MHz. The details of the simulation results are available in the attached pdf file.

These filters can be used in Identification Friend or Foe (IFF) or Secondary Surveillance Radar (SSR) systems.

Narrowband Filter 20MHz Bandwidth at 1030MHz – HFSS Design

admin — Sat, 05 Dec 2020 05:35:04 +0000

This item is a design of narrowband filter with 20MHz bandwidth at 1030MHz in ANSYS HFSS. The inputs are 50Ω SMA connectors. The order of the filter is four and its return loss is less than -15dB within 1022MHz to 1038MHz.

This filter can be used in Identification Friend or Foe (IFF) or Secondary Surveillance Radar (SSR) systems.

Python Script for Import of Variables in ANSYS HFSS

admin — Tue, 01 Dec 2020 04:33:48 +0000

This item is a Python script which can import variables (including project and design variables) in ANSYS HFSS. The script asks the user for a file name via a dialog box and then imports all of the variables from the file.

The file containing variables is a text file which can be created by a text editor (e.g. notepad) or by the rfsims export script.

Since the script uses Microsoft Forms, the Operating System should be Microsoft Windows.

Microstrip Fed Patch Antenna at 10GHz with Linear Polarization – HFSS Design

admin — Fri, 16 Oct 2020 04:45:46 +0000

This file simulates a single Microstrip Patch Antenna at 10GHz in ANSYS HFSS. The patch is fed by a 50Ω microstrip line. The substrate which the patch lies is Rogers 5880 with the thickness of 30mil.
The polarization of the antenna is linear.

Coax Fed Microstrip Patch Antenna at 10GHz with Linear Polarization – HFSS Design

admin — Thu, 15 Oct 2020 04:13:38 +0000

This file simulates a single Microstrip Patch Antenna at 10GHz in ANSYS HFSS. The patch is fed by a 50Ω coaxial cable via an SMA connector. The substrate which the patch lies is Rogers 5880 with the thickness of 30mil.
The polarization of the antenna is linear.

X-Band Coax to Waveguide Adaptor – HFSS Design

admin — Wed, 30 Sep 2020 16:12:10 +0000

This item simulates a coax to waveguide adaptor in ANSYS HFSS. The structure is simulated in X-band (8GHz~12GHz). The coax connector is an SMA and the waveguide is WR-90.

There are four designs:

Design 01 which has a return loss of better than -12dB
Design 02 which has a return loss of better than -15dB
Design 03 which has a return loss of better than -23.5dB
Design 04 which has a return loss of better than -22.5dB

Designs 01 and 02 have two files:

Complete structure
Half structure using symmetry

X-band Pyramidal Horn with 21dB Gain at 10GHz – HFSS Design

admin — Fri, 15 May 2020 08:46:44 +0000

This item simulates the performance of a conventional pyramidal horn in ANSYS HFSS. The structure is simulated in X-band (8GHz~12GHz) and the realized gain of the antenna is 21dB at 10GHz. The input of the antenna is a standard WR-90 waveguide.

The simulation is fully parameterized and the user can change the parameters and optimize the antenna according to the user’s needs.

There are two simulation files: a) complete structure, b) quarter of the structure which uses E- and H- symmetry boundaries. The user can download the bundle which includes both of the simulation files.