Article
Engineering, Electrical & Electronic
Aria Hosseini Tabatabaee, Farzin Shama, Mohammad Amir Sattari, Saeed Veysifard
Summary: A miniaturized Wilkinson Power Divider (WPD) was designed with optimized resonator shapes to reduce size and achieve good performance metrics, suitable for use in communication applications.
JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Dehao Zhao, Feng Lin, Houjun Sun, Xiu Yin Zhang
Summary: This article presents a dual-band substrate integrated waveguide (SIW) filtering antenna with improved out-of-band rejection. It achieves three radiation nulls through multiple coupling paths and utilizes metal-insulator-metal (MIM) capacitors for circuit miniaturization and wide upper stopband.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Computer Science, Information Systems
Dilip Kumar Choudhary, Naveen Mishra, Prashant Kumar Singh, Anand Sharma
Summary: This paper proposes a miniaturized and simple power divider using coupled lines for triple-band filtering response. The power divider achieves three passbands with a filtering response by utilizing coupled line structure and microstrip resonators. The resonance frequencies of the passbands can be controlled by adjusting the structural parameters of the power divider.
Article
Engineering, Electrical & Electronic
Michael L. Laurenzi, Yahia M. M. Antar, Alois P. Freundorfer, Michel Clenet, Slobodan Jovic
Summary: This letter proposes the design and characterization of a low profile two-way equal power splitter operational over the lower- and upper-GNSS bands, utilizing low temperature cofired ceramics (LTCC) for miniaturization. The splitter dimensions are only 3.9 x 6.23 x 1.28 mm³, with good performance across both bands.
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2021)
Article
Engineering, Multidisciplinary
Mohamed A. Koura, Ayman S. Al-Zayed, Mahdi M. Chehimi
Summary: This paper presents the design of a dual-band six-way power divider with equal and unequal power division capabilities. The unequal design allows for four different output levels at each band and achieves band-distinct power division ratios. The proposed divider incorporates dual-band pi-shaped impedance transformers to realize these capabilities. Analytical derivation of the S-parameters and a detailed design procedure are provided. Four prototypes operating at 0.9/1.4 GHz are fabricated and measured, demonstrating close agreement between measured and theoretical values for output power levels and good input matching (<-15 dB) at both bands.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Na Nie, Zhi-Hong Tu
Summary: This dual-band antenna utilizes a dual-function slot structure for future microwave and millimeter-wave communication systems. It serves different purposes in the low and high frequency bands, achieving wideband harmonic suppression through well-designed configurations.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Amirhossein Qaedrahmati, Akram Sheikhi, Abdolali Abdipour
Summary: In this paper, a wideband filtering Wilkinson power divider embedded with square-loop resonators and short-circuit stubs is designed and presented. The proposed circuit achieves good performance in terms of insertion loss, return loss, and isolation over a wide frequency range. Measurements results show good agreement with simulation results, validating the effectiveness of the design.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2022)
Article
Computer Science, Information Systems
Asif I. Omi, Md. Hedayatullah Ahammad, Md. Hedayatullah A. Maktoomi, Mohammad K. Maktoomi, Praveen Sekhar
Summary: In this paper, a novel analytical design technique is presented for implementing a miniaturized 3-way power divider with a wideband operation. The proposed design utilizes four distinct transmission lines and two isolation resistors. The theoretical analysis provides new design equations and S-parameter equations that demonstrate the wideband capability of the design. A fabricated prototype exhibits excellent performance and the design is suitable for various applications.
Article
Optics
H. A. O. Chen, Erwin H. W. Chan
Summary: This photonic microwave frequency divider achieves high order frequency division by injecting an optical signal into a DFB laser, showing high reconfigurability and over 35 dB harmonic component suppression.
Article
Engineering, Electrical & Electronic
Rajesh Kumar, Sachin Kumar, Binod Kumar Kanaujia
Summary: This paper presents an efficient Doherty power amplifier (DPA) with optimized harmonic impedance inverter. The proposed design includes carrier and peaking power amplifiers for class F- and class F-1-based operations. A multiharmonic non-uniform stepped-impedance transmission line-based input-output matching network is also designed. The fabricated chip exhibits high efficiency, power added efficiency, and gain, with a compact size compared to existing DPAs.
INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Yanyuan Zhu, Jianpeng Wang, Jiasheng Hong, Jian-Xin Chen, Wen Wu
Summary: This paper introduces a new approach to design filtering power dividers using regular triangle patch resonators, showcasing the flexibility of the resonator and the good performance of the power dividers. By developing a specific excitation scheme and deploying shorting posts, successful design and measurement of two-way and three-way power dividers are achieved, with good agreement between measured and simulated results.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
(2021)
Article
Engineering, Electrical & Electronic
Mohsen Hayati, Mohammad Amir Sattari, Sepehr Zarghami, Seyed Maziar Shah-ebrahimi
Summary: This paper presents a miniaturized Wilkinson Power Divider (WPD) that can attenuate unwanted harmonics up to the 19th harmonic. By embedding a low pass filter and using a specific structure design, the size of the structure is reduced. Even and odd mode analysis were performed and experiments were conducted at a frequency of 1.95GHz, showing good agreement with simulation results.
JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Yunlong Lu, Lintong Xu, Yang You, Jun Xu, Jifu Huang
Summary: This paper presents a substrate-integrated dual-band continuous transverse stub (CTS) leaky-wave antenna (LWA) that supports dual-band beam scanning. By using different types of CTS slots, the excitation of n = -1 harmonic is achieved in two frequency bands. The addition of matching stubs and corrugation arrangement of radiating slots suppress open stopbands and enable continuous beam scanning. Experimental results demonstrate scanning ranges of -48 degrees to +50 degrees and -53 degrees to +38 degrees, with peak gains better than 8.4 dBi and 13.2 dBi in the low- and high-frequency bands, respectively.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Computer Science, Interdisciplinary Applications
Yun Liu, Sheng Sun, Lei Zhu
Summary: This article introduces a class of dual-band filtering power dividers that achieve good designable port-to-port isolation. By introducing filtering branches and isolation networks, controllable bandwidth, frequency ratio in dual-band power division, and port-to-port isolation can be simultaneously achieved. Multiple transmission zeros in the S-32-magnitude enable dual- or wide-band isolation, while simulated and measured results verify theoretical predictions.
INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING
(2021)
Article
Engineering, Electrical & Electronic
Chun-Mei Liu, Shao-Qiu Xiao, Ke Wu
Summary: This work investigates a cylindrical open-ended substrate-integrated waveguide (SIW) cavity and proposes two dual-band antenna structures using composite and aperture-shared designs. These antennas are easy to fabricate using conventional printed circuit board techniques and can be integrated with other planar circuits. Compared to other open-ended cavity antennas, the proposed cylindrical counterparts offer a more compact size and lower profile.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Zhongqi He, Changjun Liu
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2020)
Article
Engineering, Electrical & Electronic
Liqiang Xu, Binyu Yan, Changjun Liu
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2020)
Article
Physics, Fluids & Plasmas
Xiaojie Chen, Ze Yu, Hang Lin, Xiang Zhao, Changjun Liu
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2020)
Article
Engineering, Electrical & Electronic
Hang Lin, Xiaojie Chen, Zhongqi He, Yuyang Xiao, Wenquan Che, Changjun Liu
Summary: This letter introduces a microwave rectifier composed of a pair of Schottky diodes with dynamic capacitive self-compensation, enhancing the rectifier's dynamic power range and efficiency. The method using paired diodes for capacitive self-compensation reduces the impact of input power on the diode impedance.
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Xiaojie Chen, Bo Yang, Naoki Shinohara, Changjun Liu
Summary: A novel dual-way magnetron power-combining system was developed and tested in this study, which achieved phase control and frequency locking of two MGTs under an asymmetric H-plane tee, improving power combining efficiency. The closed-loop phase compensation method significantly reduced phase noise level of the combined output and allowed for phase adjustment within a certain range.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2021)
Article
Engineering, Electrical & Electronic
Zhongqi He, Jing Lan, Changjun Liu
Summary: Two high-efficiency RF rectifiers with extended input power range are proposed by utilizing the nonlinear impedance characteristics of diodes. Each rectifier operates at different power levels using a nonlinear power division strategy. The results show that both rectifiers achieve over 50% power conversion efficiency in different input power ranges.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Xin Lei, Liqun Ye, Shengjun Li, Chun Deng, Chao Fan, Xiaoyan Gui, Binyu Yan, Changjun Liu
Summary: The 5-bit CMOS attenuator presented in this paper achieves low RMS attenuation error and phase variation by employing optimization and compensation techniques. By optimizing the ratio of transistors and attenuation resistors and using temperature and process compensation circuitry, chip-to-chip and channel-to-channel variations are effectively minimized.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Changjun Liu, Hang Lin, Zhongqi He, Zhizhang Chen
Summary: This paper presents two compact patch rectennas for microwave wireless power receivers. These rectennas do not require impedance matching networks and have been tested to have high conversion efficiency and dynamic power range.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2022)
Article
Engineering, Electrical & Electronic
Zongyang Dan, Zhongqi He, Hang Lin, Changjun Liu
Summary: This letter presents a new compact patch rectenna that improves the rectifying efficiency. The impedance of the diode and patch antenna are matched well by tuning the patch antenna and short-ended transmission line. A maximum rectifying efficiency of 82.2% is achieved when working at 2.45 GHz.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Haoming He, Hang Lin, Pengde Wu, Qi Li, Changjun Liu
Summary: In this study, a compact and efficient broadband rectifier is proposed for wireless energy harvesting applications. By using a coupled transmission line and Schottky diode, the rectifier achieves impedance matching and compression of impedance variation, resulting in high RF-dc conversion efficiency. The experimental results show good agreement with simulation results, and the rectifier maintains high efficiency at different frequencies and input powers.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2022)
Article
Engineering, Electrical & Electronic
Shaoyue Wang, Yang Shen, Chongwei Liao, Jianwei Jing, Changjun Liu
Summary: A novel injection-locked S-band microwave oven magnetron system is proposed, which is the first time microwaves have been injected through magnetron filaments. The system achieves low cost and compact injection locking by utilizing the intrinsic isolation between the magnetrons' output and filament. The experiment results show that the proposed system works reliably and has significant potential applications.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Engineering, Electrical & Electronic
Dingnan Liu, Ling Wang, Zhongqi He, Changjun Liu
Summary: In this letter, a self-packaged substrate-integrated suspended line (SISL) rectifier is proposed. The rectifier consists of a quarter-wavelength high-impedance transmission line, a diode, a tuning inductor, and a dc pass filter. The lower the power is, the lower the rectifying efficiency is. At a low input power level, the diode impedance real part is almost zero. A tuning inductor is introduced to form a parallel resonator to enhance the diode voltage. A quarter-wavelength high-impedance line is presented to match the rectifying diode to the source. In addition, due to the self-packaging characteristics and air cavity of SISLs, the radiation loss and dielectric loss of the proposed rectifier are reduced. A rectifier was designed, fabricated, and measured at 5.8 GHz. The radio frequency (RF)-dc conversion efficiency reaches 3.5% at -30 dBm, which is close to its theoretical estimated efficiency at 5.8 GHz. This ultralow power rectifier may be used in energy harvesting at C-band.
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Xueman Sun, Changjun Liu, Yi-Dan Chen, Jianwei Jing, Zhongqi He, Pengde Wu
Summary: This letter introduces a novel integrated rectifier-transmitter (IRT) to reduce the power consumption of uplink communication in wireless sensors. Experimental results demonstrate that the proposed IRT can achieve an uplink data rate of up to 100 kb/s.
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Ze Yu, Liqiang Xu, Changjun Liu
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2020)
Article
Engineering, Electrical & Electronic
Yang Yang, Zhipeng Fan, Tao Hong, Maoshun Chen, Xiangwei Tang, Jianbo He, Xing Chen, Changjun Liu, Huacheng Zhu, Kama Huang
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2020)
