Micromachined transformers are complex devices. Conductors, insulators and magnetic materials are manufactured on the same substrate, thus leading to transformer structures often with many manufacturing levels. We describe here a new low cost solution to make quasi-planar transformer structures. The primary and secondary coils are manufactured separately and assembled by flip-chip technology. T...

Inductively coupling power transfer is an emerging technique, which enables power transfer to loads through air. The contactless transformer is the key component of it, and the design of a transformer is a timeconsuming work with a large number of tests. In this paper, a design method of contactless transformer with finite element analysis is presented. First the contactless transformer model i...

This paper presents a design of an impedance transformer (IT) with high frequency selectivity characteristics. The frequency selectivity can be controlled by evenand odd-mode impedance of a shunt coupled transmission line (TL). For experimental validation, a 50to 20Ω IT was implemented at a center frequency (f0) of 2.6 GHz for the long-term evolution signal. The measured results were in good ag...

In this paper we introduce digital Hilbert transformers composed of identical allpass subÞlters that are interconnected via extra multipliers. In the simplest case the overall transfer function corresponds to M Hilbert transformers in cascade where each transformer is derived by frequency shift of a half-band IIR Þlter. The overall transformer can also be designed to have a smaller passband rip...

The advancement in semiconductor technology has provided a new alternative to the hundred year old conventional transformer technology by providing an elegant solution using Solid State Transformer (SST). The SST is applied semiconductor technology for changing the voltage ratio. The SST can achieve high power density as well as operation at high frequency, thus reducing the size and the cost. ...

This paper describes a design of 1×4 series fed Microstrip Patch Antenna Array for multi-resonance applications such as GPS devices, WCDMA (1910–2190 MHz) and WLAN. This antenna array consists of patch elements using a single layer RT/Duroid 5880 substrate with transformer coupled impedance matching network, which provides high gain of 9.583dB and efficiency 96.08%. This antenna array has good ...

A dual GTO current source converter topology with sinusoidal inputs is proposed for high power applications. The sinusoidal input current is realized by using PWM techniques to eliminate 11th and 13th harmonics and a transformer to cancel Sth, 7th, 17th and 19th harmonics. Three switching patterns are proposed with a switching frequency of 360Hz or 420Hz. The combination of these switching patt...

Precise detection and localization of faults in power transformer windings for ultimate protection is the key issue. The insulation quality in windings majorly determines the enduring transformers function. Achieving as accurate and efficient detection method of partial discharge (PD) in transformer windings is challenging. The occurrence of PD being primarily responsible for the transformers f...