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An accurate and efficient angle‐linear calculation is proposed for three‐phase inductive angle‐linear. Envelope differences of induced signals on three two‐phase receiving coils are demodulated for angle calculation, in order to remove the third harmonic. A circuit architecture is proposed for accurate and efficient angle‐linear calculation in which an algorithm is proposed for adaptively outputting envelope differences at a larger slope and then fitting the outputs of envelope differences to straight lines. The proposed method is realized and verified in a 180‐nm commplementary metal oxide semiconductor process. Except for efficient angle‐linear calculation, the third harmonic and the nonlinearity are improved from ‐30.9 dB to ‐92.4 dB and from ±14.8% to ±1.5%, compared with envelopes‐based angle‐linear calculation. Accurate and efficient angle‐linear calculation is proposed for an inductive angle sensor (IAS). Envelope differences are demodulated in IAS in order to remove the third harmonic. The envelope differences at a large slope are fitted to straight lines, which are used for efficient angle calculation.

A miniaturised rat-race coupler capable of suppressing the second and third harmonics is proposed. The coupler is designed with slow-wave synthesised transmission lines using two π-networks in cascade. Each π-network is formed by a parallel LC tank and two shunt capacitors, and is associated with a transmission zero for harmonic attenuation. The two transmission zeros embedded in the synthesised line can be controlled independently. The proposed rat-race coupler, centred at 2.4 GHz with an operational bandwidth of 18.8%, and at least 21-dB suppression at the second and third harmonics, features a compact footprint, which is only 12.9% the size of its conventional counterpart.

To improve the power quality and reliability of series-connected multi-pulse rectifiers (MPR), a passive harmonic suppression method is proposed in this paper. According to the topology of the rectifier, the operation modes are examined, and the operating waveforms are studied based on the operation modes. Based on the operating waveform of the rectifier, the relationship between the input voltage and the turns ratio of the auxiliary single-phase transformer (AST) is obtained, and the optimal turns ratio of the AST is calculated. The obtained results express that the input voltage THD is 4.4%, and that the input current THD is about 2.6%. The magnetic rating of the AST is only 1.72% of the output power. The proposed passive harmonic suppression method has the advantages of low loss and good harmonic suppression capability.

In this paper, a novel slow-wave defected ground structure (DGS) is loaded on the upper surface of the half-mode substrate integrated waveguide (HMSIW), and compact wideband DGS-HMSIW filter with high harmonic suppression and low insertion loss (IL) is designed. The sizes of DGS-HMSIW filter is 24×8.8 mm 2 . For further demonstration, the designed BPF is fabricated and measured. The measured results are basically consistent with the simulation results, verifying the feasibility of the DGS-HMSIW filter design proposed in this paper.

A novel microstrip diplexer for global system of mobile (GSM) and wireless local area network (WLAN) bands using common shorted stubs is proposed. Two transmission zeros on both sides of the passband response can be easily realised for each passband. Additional transmission zeros created by the shorted stubs are introduced to suppress the harmonic of the microstrip diplexer. A microstrip diplexer with high isolation and selectivity can be achieved by locating the transmission zeros of each channel. A microstrip diplexer prototype with 30 dB isolation from 0.1 to 6.0 GHz has been designed and fabricated.

A new type of lowpass filter with an ultra-wide stopband, sharp transition and compact size is proposed. To reduce the circuit size, a bended transmission line is adopted in the stepped impedance resonators. To achieve a sharp roll-off, a pendulum-shaped resonator is implemented in the filter. The transition band is from 1.30 to 1.45 GHz with −3 and −20 dB, respectively. The stopband with an attenuation level better than 20 dB is from 1.45 up to 23.4 GHz, hence an ultra-wide stopband with 18th-harmonic suppression is achieved. Furthermore, the proposed filter exhibits an extremely small size of 0.09λg × 0.11λg where λg is the guided wavelength at the cutoff frequency.

The output common-mode voltage (CMV) will bring many negative effects in a three-phase inverter, which is controlled by the sinusoidal pulse-width modulation (SPWM) method. The carrier phase-shift method and the carrier-frequency modulation method can reduce the peaks of the CMV at the switching frequency and its harmonic frequencies, but they may cause increase of the low-frequency (LF) baseband harmonics. A new reverse injection scheme is proposed to suppress the LF harmonics. In this scheme, the parameters of the interference peaks are obtained through CMV detection and real-time harmonic parameters estimation. The estimated phase errors from the detection-control delay are amended by the method of temporary addition of the standard phase signal. Then, the sinusoids with a reverse phase to the LF harmonics are generated and injected in the reference sinusoid of each phase to produce the SPWM. Thus, the LF peaks of the CMV are counteracted. The feasibility and the validity of this scheme are verified through the experiments under different control strategies.

The static frequency converter (SFC) in a pumped storage power plant often causes harmonic problems in the dragging processes, which may lead to the false operation of automatic devices in the power station, and even damage to the power equipment. These harmonics caused by SFC contain both characteristic and non‐characteristic degrees, and the components are more complex. Hence, the existing harmonic suppression methods using active power filter or passive power filter compensation all have some problems. The SFC starting control strategy based on linear active disturbance rejection control (LADRC) is proposed here to reduce the non‐characteristic harmonics. First, the factors affecting the non‐characteristic harmonic content are analysed, and a mathematical model of the conventional SFC starting transfer function is established. On this basis, the LADRC controller is used as the speed loop of SFC starting to replace the proportional integral (PI) controller. The stability is judged by drawing the Bode plot and the zero‐pole plot. Finally, a Matlab/Simulink simulation model of LADRC‐based SFC starting is established in a pumped storage power plant with actual parameters, and simulation accurate measurements verify the effectiveness of the proposed control strategy for non‐characteristic harmonic current suppression. This letter proposes a control strategy based on linear active disturbance rejection control (LADRC) to alleviate the delay triggering angle α non‐characteristic harmonics caused by transient disturbances. The validity of the conclusion was verified through on‐site data collection, theoretical analysis, and simulation verification.

A novel bandpass filter with multiple transmission zeros using open/shorted dual-behaviour resonators (DBRs) is proposed. Three transmission zeros on both sides of the bandpass responses can be easily realised. Three additional transmission zeros without bandstop/lowpass networks are used to suppress the second harmonic. A bandpass filter prototype with 15 dB rejection level in the upper stopband from 1.1f0 to 2.72f0 (3 dB fractional bandwidth 7.3%) has been designed and fabricated.

A 10.2–12.6 GHz balanced heterojunction bipolar transistor (HBT)–high electron mobility transistor (HEMT) frequency tripler is presented. A pair of common-base/common-emitter HBTs is used to generate in-phase and out-of-phase harmonics. Two bandpass filters are utilised as matching networks to enhance the harmonic suppression. A common-gate/common-source HEMT active balun is employed to combine the third harmonic in-phase and provide conversion gain. The proposed frequency tripler shows a conversion gain of 2.8 dB, a fractional bandwidth of 21.2% and a fundamental suppression higher than 47 dB.