EMWorks Newsletter 2020 EMWorks User Conference 2020



Nashville, TN
Booth #428
February 9-12, 2020


Motor & Drive Systems 2020
Orlando, FL
Booth #303
February 11-12, 2020


APEC 2020
New Orleans, LA
Booth #2026

March 15-19, 2020


Shanghai, China
Booth #2A53
March 24-26, 2020




Rectangular waveguide structures for bandpass filters with inductive irises are the most suitable and popular solutions for the THz (Terahertz) region. They are indispensable components of microwave links for satellite and radio communication systems to reduce the occurring interference signal and to filter the desired frequencies.

In this study, a 100 GHz rectangular waveguide band-pass filter with two transmission zeros symmetrically located at both ends of the structure, is presented. The four-pole filter is composed of two dual-mode resonators with unequal width, two WR-10 standard waveguide interfaces with rounded corners for inductive irises in series. Thermal behavior of the BPF is investigated.

The next figure shows the schematic illustration, cross-section view and 3D design of the studied BPF with its outer metallic cover.

Figure 1 - a)- The schematic illustration [1] b)- cross-section view and c)-3D design inside SOLIDWORKS of the studied BPF

The S-parameters solver of HFWorks is used (excitation power 1W), coupled to the thermal for a working frequency range of [94 GHz-106 GHz].

The electric and magnetic field distributions are presented in Figure 2.

Figure 2 - a) Electric and b) Magnetic field distribution at 100GHz

The return and insertion losses plot versus frequency is presented in Figure 3. Simulation and measurement results agree very well.

The deviation of insertion and return loss results could be caused by uneven surface error or unclose connection between the filter structure and the network measurement analyzer [1].

Figure 3 - Return and insertion loss results versus frequency compared to measurements.

A steady state thermal analysis coupled to the S-parameters study is used to perform the thermal behavior of the studied BPF.

Temperature distribution across the filter air cavity with an average of 35.87 C is shown in Figure 4). Heat flux density is plotted in Figure 5). It demonstrates maximum value at the rounded corners of the inductive irises.

Figure 4 -Temperature distribution at 100 GHz

Figure 5 - Heat flux distribution at 100 GHz



US health experts hosted fictional coronavirus pandemic 'tabletop exercise' simulation to see how authorities would react - three months BEFORE the outbreak in China

- Scientists at Johns Hopkins Center for Health Security hosted event in October
- Exercise was not intended as a prediction; it aimed to show how governments and industry would respond to severe pandemic
- Real-world coronavirus - nCoV-2019 - has infected over 1,400 people worldwide and killed 42; epicentre, the Chinese city of Wuhan, remains on lockdown
- Center for Health Security's inputs for modelling potential impact of fictional virus were not similar to nCoV-2019

Article source : Daily Mail



FREE event on Electromagnetic Design inside SOLIDWORKS

Nashville, TN
Thursday, February 13, 2020 - 9:00 AM – 4:00 PM PST