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Passive microwave systems are traditionally characterised in the frequency-domain with a vector network analyser (VNA). The measurement of antennas typically takes place in an anechoic chamber where the interference from spurious reflections and outside noise is minimised. Despite the high level of accuracy achieved with this approach, such facilities have high costs associated with them. Recent publications have demonstrated the characterisation of antennas using a step-function time domain reflectometer (TDR) along with frequency-domain processing techniques. Localisation of the measurement in time prior to transformation allows for the dismissal of unwanted spurious reflections, eliminating the need for an anechoic chamber. An alternative technique is proposed whereby an impulse generator is employed in place of the step generator i...
There is currently no traceable power sensor for millimetre wave frequencies above 110 GHz. This thesis investigates a novel approach to remove this limitation by combining the placement of a uniquely designed microchip directly in waveguide. The design of the chip is novel in that it does not rely on a supporting structure or an external antenna when placed in the waveguide. The performance of the design was primarily analysed by computer simulation and verified with the measurement of a scale model. The results show that it is feasible to measure high frequency power by placing a chip directly in waveguide. It is predicted that the chip is able to absorb approximately 60% of incident power. Any further efficiency would require modification of the chip substrate. However, this proposed design should allow the standards institutes a re...
iDCC is the new implement of Digital Command Control (DCC) with a better user interface and a much better user experience compared to the existing DCC controllers on the market. The iDCC project was carried out firstly at 2009 and the proof-of-concept prototype was available at the beginning of this project. The goal of this project is to prepare this prototype for a commercialization through the real-world industry arrangement. This is also a new framework of a Master degree project. The author of this thesis has acted as a project manager and a hardware engineer to work with a 4-member software team and a 2-member marketing team whom all are the students of the University of Waikato. As hardware engineers, the duties were to test the previous prototype and develop a brand new hardware which has more functionality and stability. With ...
You and I, dear reader of IEEE Microwave Magazine, are set to become more valuable day by day. Let me see if I can paint a picture of why.
Keynote Speech. New Zealand has a thriving electronics industry with a long history. The renowned Kiwi ingenuity fits in well with the creative, understanding-based aspects of electronics, a discipline that is both an art and a science. However, the face of electronics is changing with the passing decades.
Retention of students in early electronics courses is a problem acknowledged worldwide. It is a particular problem in universities, such as the University of Waikato, that have a common first-year programme because students can change streams (e.g. from electrical to mechanical) at the end of the first year. It is commonly believed that the major reason for the low level of student retention is practical engagement—mechanical engineers can see and get their hands on boats, cars, propellers, cogwheels and so forth from the start, while electronics is too small to see and handle, and its workings are alien to most school leavers.
The goal of this letter is to point out that the fastest way to weaken any society and its business model, including the IEEE and its reader-pays stance, is to lose your professional integrity.
We propose a new method for the measurement of (group) delay from the radio-frequency (RF) input to the intermediate-frequency (IF) output of a mixer or a receiver. The method is particularly convenient for measuring the change in group delay with the local-oscillator (LO) tuning frequency of the receiver since the method does not require access to, or even knowledge of, the LO signal. The method employs a calibrated comb (impulse) generator. Other required equipment is limited to a reference signal generator and a digitizer of modest bandwidth, allowing the measurement to rely on a low-frequency generator and an oscilloscope. Simulated and measured data are presented to verify the approach.
We present theory and measured performance of an autonomous slot car driven by a heuristic algorithm on a typical track. The hardware consists of a PIC 8-bit single-chip microcontroller with various sensors driving a standard permanent-magnet (PM) brushed dc (BDC) motor in a mechanically-standard Scalextric platform. We present some interesting results concerning the relative difficulty of apparently-balanced lanes on a track. The car achieves optimum lap times with high consistency. Measured performance agrees with theoretical expectation. The consistency of performance allows the impact of experimental changes to be reliably assessed.
This manuscript reports the threshold concepts identified over a two-year study in early circuits and electronics courses. Some novel methods have been used to improve confidence in the identification process. We also identify some concepts, potentially threshold, that ought to have been mastered in high-school physics courses but that are often absent from student repertoires. Weak understanding of these underlying concepts may be a confusing factor for researchers in their search for threshold concepts as well as an additional source of trouble for students of electronics.
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