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APRIL 2023 I DESIGN007 MAGAZINE 37 • e impedance of a CPW is determined by the ratio of trace width to clearance, so size reduction is possible without limit, the only penalty being higher losses. • SIW are planar structures fabricated using two periodic rows of PTH vias or plated slots connecting adjacent copper ground planes of a dielectric substrate. • SIW structures have emerged as a viable alternative to microstrip lines due to their low loss, and are ideally suited to the high-speed transmission of electro- magnetic waves. • Several types of transition from SIWs to microstrip or CPW structures are possible but most are challenging to implement. e dual-layer microstrip- to-SIW transition is undoubtedly the simplest. • CPW technology is more amenable to integration with leadless monolithic microwave integrated circuits. DESIGN007 References 1. Beyond Design columns by Barry Olney: "The Frequency Domain," "Next Gen PCBs: Substrate Integrated Waveguides," "Microstrip Coplanar Wave Guides," "It's a Material World, Plane Cavity Reso- nance." 2. "Partitioning for RF Design," by Andy Kowalewski (RIP, old friend). 3. "A Review on Substrate Integrated Waveguide and its Microstrip Interconnect," by Kumar, Jadhav, Ranade. 4. "Transitions from Substrate Integrated Wave- guide to Planar Transmission Lines and their Applica- tions to Amplifier Integration," by Farzaneh Taringou. 5. "What is RF Circuit Design? How to Design RF Circuits," by Synopsys. Barry Olney is managing direc- tor of In-Circuit Design Pty Ltd (iCD), Australia, a PCB design service bureau that specializes in board-level simulation. The company developed the iCD Design Integrity software incor- porating the iCD Stackup, PDN, and CPW Planner. The software can be downloaded at icd.com. au. To read past columns, click here. Changes are ahead when it comes to testing students' knowledge. The arrival of ChatGPT challenges both the university's teachers and its disciplinary board. Artificial intelligence helping students write essays and assignments is already a reality. One problem is that university plagiarism checks can- not identify texts not written by the students themselves. "AI is a technology that brings fantastic oppor- tunities. We shouldn't focus only on the risk of cheating brought on by AI, but also on how to benefit from this technology in our teaching and examinations," says Karin Axelsson, deputy vice- chancellor at Linköping University and chair of its Disciplinary Board tasked with handling attempts at cheating, etc. So far, the Disciplinary Board has not handled any cases relating to the use of Chat GPT. Accord- ing to Axelsson, this is because this technology is currently difficult, if not impossible, to detect. "Like all other education providers, LiU realises that Chat GPT presents new opportunities for stu- dents wishing to take a shortcut in certain types of examinations. Course coordinators should try to find solutions to how examination of texts not written in an examination hall can be com- plemented with other ways of testing students' knowledge," says Axelsson. (Source: Linköping University) The AI-shortcut Requires Re-thinking of Examination