3D EM/Circuit Co-Simulation

Wearable Antennas for Body Centric Wireless Communication

Wearable Antennas for Body Centric Wireless Communication
Wireless body area networks are an increasingly important area of research and show great promise for monitoring and communication in diverse application areas such as healthcare, public safety and defence. The antenna is the crucial enabling component which allows communication between sensors, and with other off-body systems (e.g. GPS and GSM). But the antenna operates in a particularly challenging environment, in close proximity to the human body, and its performance may be affected by deformation, e.g. if integrated directly into clothing. The design of these antennas is thus challenging, and numerical simulation is an indispensable tool for the antenna engineer. This webinar will discuss the key challenges in the virtual prototyping of body worn antennas, describing how CST MICROWAVE STUDIO can be used to construct realistic flexible and conformal geometries, and how these can be studied and optimized in the context of their body-centric environment. Read full article..

Combined 3D electromagnetic and spin response simulation of MRI systems webinar

Combined 3D electromagnetic and spin response simulation of MRI systems webinar
Magnetic Resonance Imaging (MRI) systems rely on a complex interaction of different physical domains: electromagnetic fields trigger a response of nuclear spins inside the human body, while thermal heating of the body needs to be controlled. The quality of the resulting MR image depends both on the homogeneity of the underlying RF fields and on the sequence chosen to create the image. Read full article..

Simulation of EMI in Hybrid Cabling for Combining Power and Control Signaling

Simulation of EMI in Hybrid Cabling for Combining Power and Control Signaling
An increasing trend in the industry is to combine power and control cables into a single hybrid cable design, reducing the complexity of the system and cost. However, without careful design, high voltage power switching transients may lead to unwanted electromagnetic interference. Typical hybrid cable design parameters may include the separation between conductors, twist rate of twisted pairs, shielding and screen types. This webcast will explore the simulation of hybrid cable design using CST CABLE STUDIO and the prediction of EMI levels. Topics covered will include the modeling of shield transfer impedance, crosstalk and induced common mode currents. Read full article..

Combined 3D electromagnetic and spin response simulation of MRI systems

Combined 3D electromagnetic and spin response simulation of MRI systems Document type
Modern MRI systems are highly complex devices, and the interaction between the body and MRI coils introduces additional challenges into the design process. The body, with its complicated heterogeneous interior, causes major disturbance to the homogeneity of the magnetic fields, while energy absorbed by the body can cause harmful heating. Experimental measurement of these effects is often impossible, but simulation with 3D body models can help the engineer identify risks to the patient and suggest ways to reduce them. Read full article..

Chip Package Board: Constraint Driven Co Design

Chip Package Board: Constraint Driven Co Design
Memory interfaces have single-ended data rates in the 1GHz-plus range and serial links are running upwards of 10 gigabits per second. A precise analysis of each of these signals is required at silicon, package and board level. The design and optimization performed on each one of these interconnection levels must be done in a global context. This webinar proposes a global methodology which combines three dimensional (3D) electromagnetic (EM) analysis for PCB and package with chip power switching macro-modeling. Difference between segmentation approach (where silicon, package and PCB are analyzed separately and then combined with standard cascading technique) and integrated/global approach (where chip, package and PCB are analyzed as single entity in a co-simulation mode) are discussed and based on the results, guidelines are outlined. Read full article..

Matching circuit optimization for antenna applications

Matching circuit optimization for antenna applications Document type
Impedance matching is an essential part of antenna design. The input impedance of an antenna needs to be reasonably close to the amplifier impedance (e.g. 50 Ohm), otherwise the signal is reflected back to the amplifier and not radiated by the antenna. In many applications matching circuits consisting of discrete inductors and capacitors, or transmission lines are used to improve the impedance matching characteristics of the antenna. This white paper discusses the optimization of matching circuits especially to antenna applications. Although the design of matching circuits sounds simple, there are many practical considerations that need to be addressed. Read full article..

Direct transient co-simulation of a Step Recovery Diode (SRD) Pulse Generator

Direct transient co-simulation of a Step Recovery Diode (SRD) Pulse Generator
The unique network co-simulation feature in CST STUDIO SUITE™ 2009 enables a direct transient simulation of a 3D CST MICROWAVE STUDIO® (CST MWS) structure with non-linear lumped components or circuit networks in CST DESIGN STUDIO™ (CST DS). This article shows the application of this feature to the simulation of a Step Recovery Diode (SRD) pulse generator. Read full article..

New simulation workflows for predicting radiated emissions

New simulation workflows for predicting radiated emissions
In this video powerful new workflows for reliably predicting radiated emissions from electronics systems will be discussed. We start by importing a complex PCB model into CST PCB STUDIO and applying new EMC rules checking algorithms to rapidly identify potential weaknesses in the design. Critical nets, planes and vias are then analyzed to determine the differential mode (DM) to common mode (CM) conversion caused by driver skew and line imbalance. Finally, the resulting transient noise waveforms are injected into a 3D model of the connector/cable assembly and radiated emissions predicted. Important features of a typical anechoic chamber test are represented in the model using external ground plane reflections and cylindrical scanning to detect the peak emissions. Read full article..

Reconfigurable Antenna Simulation

Reconfigurable Antenna Simulation
Packing more functionality into ever smaller spaces has made reconfigurable antennas very attractive for telecommunications engineers, especially given the ever expanding landscape of cellular network standards. As with any other antenna application, virtual prototyping is extremely important for accelerating the product design cycle and reducing time to market. This webinar will introduce the concepts involved in making antennas reconfigurable – for example tunable materials, mechanical reconfigurability, and RF MEMS and PIN diode switches – and will address how these can be simulated efficiently using the advanced tools in CST STUDIO SUITE 2011. Read full article..

Advanced System Simulation for Multi-Channel MRI Coils

Advanced System Simulation for Multi-Channel MRI Coils
Magnetic Resonance Imaging (MRI) has gained a lot in popularity in medical diagnoses over the past years thanks to the advantages it offers over other imaging techniques. The complex overlay of magnetic fields at frequencies from static to HF makes field simulation - even including circuit based tuning - an essential and integral part of the design and optimization process of the complete MRI system. CST STUDIO SUITE(tm), with its complete technology approach, is ideally suited to this task. Knowledge of the field distribution inside the body is crucial for the patient's safety. Since measurement of these internal fields is impossible, electromagnetic simulation can give the MRI system designer invaluable insight. Improved image quality can be achieved with the new generation of high-field MRIs, but the price of the related higher operating frequencies is that even more stringent technical challenges are introduced. These typically have to be addressed by using multi-channel coils. Using real-world examples, this webinar will give an overview of the complete MRI workflow including coil-design, circuit-based tuning, multi-channel optimization, and dedicated post-processing such as full system SAR and bio-heat evaluation. Read full article..

EMC/E3 analysis of rotorcraft electrical system exposed to antenna radiation and incident EMP

EMC/E3 analysis of rotorcraft electrical system exposed to antenna radiation and incident EMP
This webcast discusses the application of full wave modeling to predicting EMC/E3 performance in a rotorcraft. We start by investigating the coupling from a blade installed on the fuselage to internal cable systems. CST CABLE STUDIO is used to efficiently and accurately model the bi-directional interaction between electromagnetic fields and the complex cable system. True transient co-simulation enables direct time-domain analysis of voltages and currents induced in cable systems, due to an incident EMP. Finally, non-linear components are added to the model to assess the performance of transient protection devices (TPD’s). Read full article..

Electromagnetic Simulation in Radar System Design

Electromagnetic Simulation in Radar System Design
This webcast will discuss the application of CST STUDIO Suite to a full radar system design. CST’s complete simulation technology enables the most appropriate method/solver to be applied to the diverse range of components typically found in a radar system. For the digital design, combined PCB/package analysis is necessary to achieve adequate signal integrity and minimize interference/emissions Read full article..

CST EM STUDIO® and SIMULINK® for the dynamic simulation of a two-state linear actuator for an automated gear box

CST EM STUDIO® and SIMULINK® for the dynamic simulation of a two-state linear actuator for an automated gear box
This article shows a common approach to the simulation of electromechanical problems. A set of 3D electromagnetic field simulations using CST EM STUDIO® (CST EMS) are carried out on a linear actuator in order to obtain its electromagnetic characteristics for use in Simulink® where both the electrical and mechanical behaviour can be simulated. Read full article..

Six-Pole Band-pass filter with Single Cross-Coupling

Six-Pole Band-pass filter with Single Cross-Coupling
Tuning of a coupled-resonator filter is performed in this article by using the group delay response of the input reflection coefficient of sequentially tuned resonators containing all the information necessary to design and tune filters. To achieve high out-of-band rejection losses a single transmission zero is introduced producing a pair of finite frequency poles. CST MICROWAVE STUDIO® is used to optimize and/or tune the bandpass filter resonse in a complete model by applying the new, fast MOR-Frequency Domain Solver. To speed-up the tuning process the entire model is split up into several sections and recombined in CST DESIGN STUDIO™ to get the overall filter response. Read full article..

Transient Co-Simulation of a Hybrid Ring Mixer with Matching Network

Transient Co-Simulation of a Hybrid Ring Mixer with Matching Network
This article demonstrates a strong feature of CST STUDIO SUITE™: Co-Simulation of a hybrid mixer with CST MICROWAVE STUDIO® (CST MWS) and CST DESIGN STUDIO™ (CST DS). A full 3D model is simulated and matched to a network using the in-built circuit simulator. Measured results compare well to the simulated results. Read full article..

IC Package Simulation

IC Package Simulation
In this article the simulation of parasitic effects in a standard IC package is shown. The transient simulator in CST MICROWAVE STUDIO® (CST MWS) offers the advantage, that effects such as crosstalk and signal delay can be investigated in both time and frequency domain. Additionally, the simulation results can be used to generate an equivalent RLC network model that has the same S-Parameters as the 3D EM simulation but can be included in the overal circuit simulation of the logical parts of the IC. Read full article..

Five-Section Microstrip Hairpin-Filter

Five-Section Microstrip Hairpin-Filter
The example design is a classic hairpin filter with a bandwidth of 3.6 to 4.3 GHz. The hairpin filter was designed for a return loss better than -20dB across the band. CST DESIGN STUDIO™ was used to design and tune the filter, the resulting layout was then verfied with the 3D- EM simulation software CST MICROWAVE STUDIO®. Read full article..

CMOS VCSEL Driver Design using CST MICROWAVE STUDIO® and Agilent ADS

CMOS VCSEL Driver Design using CST MICROWAVE STUDIO® and Agilent ADS
CST MICROWAVE STUDIO® and Agilent ADS have been successfully employed in this OEIC driver design - an example of a high speed analog/broadband IC application.The package model was imported from Agilent momentum and the model was simulated upto a 100 GHz in CST MWS.The resulting eye diagrams of the driver design from CST MWS are compared with those from Agilent momentum and other test cases. Read full article..

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