Chaoyun Song

Chaoyun Song
Heriot-Watt University · Institute of Sensors, Signals and Systems

PhD
Specialize in emerging wireless powering, sensing and remote charging technologies

About

87
Publications
49,700
Reads
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1,375
Citations
Introduction
Current research interests include new materials for antennas, liquid antennas and RF devices, wireless energy harvesting and wireless power transfer (near and far-field), DRA, material science and measurement, metamaterials and metasurface. An active reviewer of 20+ journals such as IEEE TIE, TAP, TMTT, TPEL, TCAS-1, TCAS-II, IoTJ, Access, AWPL, MWCL etc. and other journals like APL, PRB, PRA, SR, Nature Comm and a range of MDPI and Elsevier journals.
Additional affiliations
March 2020 - March 2020
Heriot-Watt University
Position
  • Professor (Assistant)
Description
  • Please see my group website: https://sites.google.com/view/chaoyunsong/
July 2017 - February 2020
University of Liverpool
Position
  • PostDoc Position
November 2013 - July 2017
University of Liverpool
Position
  • PhD Student
Education
September 2012 - September 2013
University of Liverpool
Field of study
  • Microelectronics and Telecommunications
September 2008 - July 2012
Xi'an Jiaotong-Liverpool University
Field of study
  • Telecommunication Engineering

Publications

Publications (87)
Article
Full-text available
This paper presents a novel broadband rectenna for ambient wireless energy harvesting over the frequency band from 1.8 to 2.5 GHz. First of all, the characteristics of the ambient radio-frequency energy are studied. The results are then used to aid the design of a new rectenna. A novel two-branch impedance matching circuit is introduced to enhance...
Article
Full-text available
Impedance matching networks for nonlinear devices such as amplifiers and rectifiers are normally very challenging to design, particularly in broadband and multiband devices. A novel concept of designing a broadband high efficiency rectenna without using matching networks is presented in this paper for the first time. An off-center-fed dipole (OCFD)...
Article
Full-text available
Wireless power transfer (WPT) and wireless energy harvesting (WEH) using rectennas are becoming an emerging technology. This paper presents a novel design method for a rectenna suitable for a wide range of selectable operating frequency band, input power level and load impedance. Most importantly, it is realized without using complex impedance matc...
Article
Full-text available
A novel highly-efficient radio-frequency (RF) energy harvester (rectenna) array with multi-frequency coverages (1.7–1.8 GHz and 2.1–2.7 GHz) as well as an omnidirectional 3D radiation pattern is presented. The harvester array is very compact and of low-profile, which strategically combines 12 single Vivaldi slot rectenna elements. More importantly,...
Article
Full-text available
Backscatter communication is an emerging paradigm for pervasive connectivity of low-power communication devices. Wirelessly powered backscattering wireless sensor networks (WSNs) become particularly important to meet the upcoming era of the Internet of Things (IoT), which requires the massive deployment of self-sustainable and maintenance-free low-...
Article
As an indispensable component, the stretchable antenna with the potential use in wireless communication and radio frequency (RF) energy harvesting can provide future wearable electronics with a low profile and integrated functions. However, mechanical deformations applied to stretchable antennas often lead to a shift of their resonant frequency (i....
Article
A Radial Line Slot Array (RLSA) is proposed for Bessel-Gauss beam generation with a narrow main beamwidth and low sidelobe characteristics for non-metallic internal defects detection. Owing to the radial attenuation factor of Gaussian function, the sidelobe level of Bessel-Gauss beam can be suppressed. By accurately adjusting the slot position and...
Article
Full-text available
Traditionally, the signal power is divided equally between dual functions in Wireless Information and Power Transmission (WIPT), which, intuitively, is not an optimal solution since the power sensitivities for communication and charging node pose different constraints for signals. To address this challenge, a two-channel rectenna with an asymmetric...
Preprint
Full-text available
Recently, immense amounts of emphasis is placed on research with respect to ambient backscatter communication (AmBC), which is a revolutionizing technique for the smart city. The wireless powered communication (WPC) as another revolutionary technology can extend the life of wireless networks. In order to combine the advantages of both AmBC and WPC,...
Article
It is well known that the maximum amount of power in an electrical or electronic system can be transferred to a load when its impedance is the complex conjugate of the source impedance, although, the power transfer efficiency is only 50%. Is this fact true for a radio system, as well? The question has existed for decades. In this article, the equiv...
Chapter
Electromagnetic waves are inevitably scattered by various objects when they propagate through the environment, creating a complex, and usually unpredictable, multipath communication channel. This chapter is dedicated to the signal modulations in backscatter communications and their associated hardware realization. It introduces the basic principle...
Article
Full-text available
The liquid antenna, as a new member of the antenna family, has drawn significant and increasing attention from both academia and industry due to its unique features. In this paper, a comprehensive review on this technology is presented which covers both metallic and non-metallic liquid antennas. Non-metallic liquid antennas are further divided into...
Article
An ultra-wideband (UWB) rectenna (fractional bandwidth >100%) using a novel wideband complementary matching stub is proposed for microwave power transmission and energy harvesting. A simple resonant structure, i.e., LC series–parallel resonant circuit, is embedded to the L-shaped complementary matching stub. Due to the unique frequency response o...
Article
The ultimate application of bio-integrated, stretchable electronics hinges on the indispensable modules of stretchable wireless data transmission and power supplies. While radiofrequency (RF) antennas and rectennas could enable wireless communication and RF energy harvesting in the far-field, their performance deteriorates because of the frequency...
Article
As the key component of wireless data transmission and powering, stretchable antennas play an indispensable role in flexible/stretchable electronics. However, they often suffer from frequency detuning upon mechanical deformations; thus, their applications are limited to wireless sensing with wireless transmission capabilities remaining elusive. Her...
Article
Full-text available
An approach to improve wireless power transfer (WPT) to implantable medical devices using loop antennas is presented. The antenna exhibits strong magnetic field and dense flux line distribution along two orthogonal axes by insetting the port inside the antenna area. This design shows excellent performance against misalignment in the y-direction and...
Article
Microwave wireless power transmission (MWPT) via radio waves has been an important research topic of the WPT systems, where the overall power transfer and conversion efficiency is a key factor to evaluate the system performance. The state-of-the-art work on MWPT has only taken the end-to-end power transfer efficiency in free space or the power conv...
Article
Full-text available
A broadband metasurface antenna with a novel hexagonal loop-shaped unit cell structure is presented. A hexagonal loop element array is proposed as the main metasurface radiator, which is aperture-fed through a microstrip line and a coupling slot. The bandwidth can be broadened from two perspectives. On the one hand, the proposed hexagonal loop elem...
Article
Extensible magnetic resonance coupling-based wireless power transfer (WPT) systems are presented in this article. A transmitter (Tx) containing an 8-shape loop and two resonators is proposed to construct a bipolar Tx array. A unipolar receiver (Rx) is placed above the Tx perpendicularly to overcome the power null phenomenon. The proposed structure...
Article
A dual-band and polarization-angle-independent rectifying metasurface (MS) with a miniaturized dimension and a wide incident angle range are presented in this article. The proposed structure consists of a single layer of periodic cell arrays with integrated diodes, a dc feed, and a load. A novel method of incorporating surface-mount components (e.g...
Preprint
Full-text available
In this paper, we design and experiment a far-field wireless power transfer (WPT) architecture based on distributed antennas, so-called WPT DAS, that dynamically selects transmit antenna and frequency to increase the output dc power. Uniquely, spatial and frequency diversities are jointly exploited in the proposed WPT DAS with low complexity, low c...
Article
Full-text available
In this article, a novel duplexing rectenna with harmonic feedback capability is proposed for efficient wireless power transfer (WPT) applications. The proposed duplexing rectenna can harvest the incoming radio frequency (RF) energy efficiently and also make use of an inherent harmonic signal, which is sent back to the RF transmitter (Tx) for posit...
Article
Full-text available
This paper presents a new type of hybrid antenna that combines the multi-resonant modes produced by a liquid dielectric resonator antenna (DRA) and a magnetoelectric (ME) dipole. Such a combination could not be easily realized by using conventional solid dielectrics due to fabrication and air-gap problems. An aperture-fed ME dipole for 4.1 – 5.3 GH...
Article
Full-text available
In this paper, we design and experiment a far-field wireless power transfer (WPT) architecture based on distributed antennas, so-called WPT DAS, that dynamically selects transmit antenna and frequency to increase the output dc power. Uniquely, spatial and frequency diversities are jointly exploited in the proposed WPT DAS with low complexity, low c...
Article
Surrogate models are widely used in antenna design for optimization efficiency improvement. Currently, the targeted antennas often have a small number of design variables and specifications, and the surrogate model training time is short. However, modern antennas become increasingly complex which need much more design variables and specifications,...
Conference Paper
Full-text available
In this work, a novel duplexing antenna is proposed for feedback wireless power transfer (WPT) applications. The proposed antenna has the capability to receive RF power at fundamental frequency 0.915 GHz and transmit the second harmonic at 1.83 GHz as a feedback signal simultaneously. Fundamental and harmonic resonances of a dipole antenna are util...
Article
A multi-polarization rectenna, consisting of a twoport antenna fed by an orthogonal hybrid coupler and a medium power rectifying circuit, is proposed. The orthogonal hybrid coupler has realized good isolation (S12 or S21 < -15 dB) between the two ports, which can be respectively connected to rectifying circuit and/or communication device for simult...
Article
Full-text available
A novel wire bonded GaN rectifier for high-power wireless power transfer (WPT) applications is proposed. The low breakdown voltage in silicon Schottky diodes limits the high-power operations of microwave rectifier. The proposed microwave rectifier consists of a high breakdown voltage GaN rectifying element for high-power operation and a novel low l...
Article
Full-text available
A dual-band dual-polarized base station antenna for the fifth-generation (5G) mobile system is presented in this paper. The proposed antenna covers the frequency bands from 3.3 to 3.8 GHz (the lower band) and from 4.8 to 5.0 GHz (the upper band) with good isolation between its ports (≥ 20 dB). It consists of two double-oval-shaped dipoles, two doub...
Article
Full-text available
This paper presents an innovative belt antenna with an electromagnetic band gap (EBG) ground plane made of textile materials. The antenna can be applied in a smart belt system which can set up a communication link with other electronic devices and host a variety of sensors to track human motions. The proposed belt antenna works at 2.45 GHz ISM band...
Article
Full-text available
A generalised probe method is proposed for fast and accurate complex permittivity measurements. The method is based on the simulated reflection coefficients using the finite difference frequency domain method. A database is set up, which consists of the simulated complex reflection coefficients of the unknown material under test. A fast searching a...
Article
Full-text available
In this paper, wireless power transfer (WPT) and energy harvesting (EH) technologies are reviewed in detail, and the application of metamaterials and metasurfaces for WPT and EH is discussed. Specifically, we focus on the metasurfaces for ambient radio frequency energy harvesting (AEH) in recent advances, comments, existing challenges, and future d...
Article
Full-text available
A self-biased adaptive reconfigurable rectenna, consisting of a microstrip patch antenna and a self-biased reconfigurable rectifying circuit, is proposed. To eliminate the need of bias networks, a DC power routing structure is introduced to link the reconfigurable matching stub and the load. Hence the output DC current obtained by the rectifier can...
Article
A compact rectenna with a wide input power range is proposed for wireless power transfer (WPT). Two different diodes, having distinct operating powers, i.e. high-input-power diode and low-input-power diode, are introduced to the rectenna design for extending the operating input power range. A mid-inductor is placed in the rectifying circuit to isol...
Article
Full-text available
This paper presents a novel design method to improve energy scavenging from AC power lines. When the magnetic core is clamped on AC power lines, the flux density of the core is proportional to the magnitude of the magnetic field strength around the power line. The flux density could reach its maximum value when the magnetic field increases. In this...
Article
Full-text available
This paper presents a quadruple-band indoor base station antenna for 2G/3G/4G/5G mobile communications, which covers multiple frequency bands of 0.8 – 0.96 GHz, 1.7 – 2.7 GHz, 3.3 – 3.8 GHz and 4.8 – 5.8 GHz and has a compact size with its overall dimensions of 204 × 175 × 39 mm3. The lower frequency bands over 0.8 – 0.96 GHz and 1.7 – 2.7 GHz are...
Article
Full-text available
Presented in this paper are experimentally measured relative complex permittivities as a function of frequency for a representative range of ionic liquids, comprising 64 imidazolium, choline, phosphonium, ammonium, pyrrolidinium, pyridinium and piperidinium cations with a variety of anions. The measurement was conducted using a coaxial probe techni...
Article
Full-text available
We present a new concept to passively steer the antenna radiation beam to a fixed direction by utilizing the liquid fluidity behaviour due to gravity. Completely different from existing technologies, the proposed antenna does not require any additional mechanical structures, phase shifting circuitry, liquid pumps, tunable elements or their associat...
Article
A novel broadband circularly polarized (CP) antenna using organic ionic liquid resonators is presented in this paper for the first time. The antenna is excited by inserting a new feeding structure into the liquid which is relatively simple but significantly improves the bandwidth and CP performance of traditional single probe-fed dielectric resonat...
Article
Full-text available
There has been an increasing demand for smart devices and smart furniture for home automation, monitoring and security applications. In this paper, we present a novel method of integrating the function of wireless energy harvesting from ambient RF signals to a conventional quartz clock for home applications. The most attractive feature is that the...
Conference Paper
Full-text available
Rapid developments in wireless communications demand an antenna that can operate at dual frequency bands in a compact size. In this work, a dual-band dual-polarised antenna is proposed for future 5G wireless communications that can operate at 28 GHz and 39 GHz 5G frequency bands. The proposed antenna is a stacked capacitive coupled patch antenna wi...
Article
Full-text available
An ionic liquid (IL) is used to make antennas for the first time. Unlike water, the proposed material has a large liquid range (-69.8 °C to 350 °C), a relative permittivity of ≈ 3, an extremely low dielectric loss and very stable thermophysical material properties. It can be used for liquid dielectric resonator antennas (DRAs), or as a loading mate...
Article
Full-text available
In this paper, a proof-of-concept high-efficiency rectifier-booster regulator (RBR) with an impedance matching converter operating at 2.45 GHz is proposed. An entire WLAN energy harvesting system is demonstrated. A flower-shaped broadband dual-polarized cross dipole antenna with a full-wave matching network is employed to harvest electromagnetic en...
Patent
Full-text available
A rectenna for high efficiency RF-to-DC wireless energy harvesting that includes an off-center-fed patch (OCFP) antenna and a rectifying circuit. The input impedance of the antenna may be tunable and directly conjugate matched to an impedance of the rectifying circuit over a wide range of frequencies and / or under different operating conditions. A...
Conference Paper
Full-text available
The power transfer efficiency of magnetic-resonance coupled wireless power transfer (WPT) systems is sensitive to the alignment of coils. In this paper, a novel multi-coil WPT system is proposed to enhance power transfer efficiency. It can overcome the misalignment problem and maintain high power transfer efficiency. The proposed coil loop structur...
Conference Paper
Full-text available
A Quasi-Yagi wearable antenna is presented in this paper for dual-band operations at WiFi bands with high individual directivities. The proposed antenna structure consists of a single-stage director, two arms of driven elements and a concave parabolic reflector. The measurement results show a directivity of 6.8 dBi with 12% bandwidth at 2.45 GHz an...
Conference Paper
Full-text available
In this paper, a novel high-efficiency rectifier-booster regulator operating in radio frequency (RF) is firstly proposed. Then an entire WLAN energy harvesting system is demonstrated. A flower-shaped broadband dual-polarized cross dipole rectenna with matching network is employed to harvest electromagnetic energy from a WiFi router. A novel rectifi...
Conference Paper
Full-text available
This paper presents a statistical evaluation of the transmission signal integrity at the intra-system level of remote sensing devices. The signal integrity is evaluated using the crosstalk induced to the signal. Due to the vague knowledge of the characteristics of the signal cable, the crosstalk becomes a random quantity and needs to be described u...