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This paper presents a study on the interference suppression effect of a resonator-embedded spiral inductor topology. In the proposed topology, a conventional single-turn spiral inductor is integrated with an embedded strong coupling ${LC}$ resonator on a printed circuit board. This ${LC}$ resonator can be designed with a specific resonant frequency near but below the operation band to achieve interference...
In this paper we propose a second-order harmonic-enhanced circuit design in an energy harvesting receiver. For accurate location detection, a LC resonator together with harmonic-enhanced coupler is placed after a dual-band Yagi-Uda antenna. This design helps the beamforming power transmitter to do maximum power transfer when an EH-receiver moves into the power transfer coverage region and its stored...
This paper presents a dual-band crossed-Yagi antenna for RF-based wireless power transfer applications. The proposed antenna has the capability of adjusting the polarization direction and detecting the second-harmonic reflected by the power receiver. To implement the design, two individual planar Yagi-Uda antennas with a dual-band operation feature, are set in an orthogonal structure. By properly...
This paper presents a design methodology of EMI/RFI suppression by SI/PI simulation at smartphone applications. In smartphones, the high speed transmission lines of display serial interface (DSI) at LCD panel are designed on a 2-layer flexible printed circuit (FPC) board. Serious simultaneously switching noise and interference are appeared to distort the GSM communication channels. In this paper,...
In this paper, we proposed a 915 MHz RF power emitter integrated with a 2×2 patch antenna array, four switchable reflection-type phase shifters with I/Q phase output, a harmonic antenna, and a microcontroller Arduino UNO. To achieve auto location identification, we proposed the rechargeable object which will contain a dual-band Yagi-Uda antenna with a diode to rectify the 915 MHz power and to reflect...
In this paper, we propose a 915 MHz RF power emitter integrated with a 2×2 patch antenna array and four switchable reflection-type phase shifters with nominal phase delay of −90°, 0°, or +90°. For achieving the object detection function, a centered harmonic antenna at 1830 MHz is also integrated to identify the location of sensor by receiving the harmonic wave reflected from the sensor. In our experiment,...
In this paper, a 915-MHz RF-power emitter with an antenna array controlled by phase shifters is proposed to make directional energy beam point to the energy harvesting (EH) receiver. For the beamforming request, a 2×2 patch antenna array and tunable 360° reflection-type phase shifters are designed. Measurement results show the energy transmission efficiency can be improved by 3.9 times higher than...
This metal mounting tag is basically a dipole-type antenna on a polypropylene (PP) substrate, a low-loss material with epsivr=2 and tandelta=0.006 at 900 MHz, backed with a ground plane. Thus, we have designed a high efficient tag antenna to be mounted on a metal object or any other object. This metal mounting tag antenna has a high gain, light weight, compact size, and low profile very suitable for...
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