Binqi Yang

Multibeam Antenna Technologies for 5G Wireless Communications

With the demanding system requirements for the fifth-generation (5G) wireless communications and the severe spectrum shortage at conventional cellular frequencies, multibeam antenna systems operating in the millimeter-wave frequency bands have attracted a lot of research interest and have been actively investigated. They represent the key antenna technology for supporting a high data transmission rate, an improved signal-to-interference-plus-noise ratio, an increased spectral and energy efficiency, and versatile beam shaping, thereby holding a great promise in serving as the critical infrastructure for enabling beamforming and massive multiple-input multiple-output (MIMO) that boost the 5G. This paper provides an overview of the existing multibeam antenna technologies which include the passive multibeam antennas (MBAs) based on quasi-optical components and beamforming circuits, multibeam phased-array antennas enabled by various phase-shifting methods, and digital MBAs with different system architectures. Specifically, their principles of operation, design, and implementation, as well as a number of illustrative application examples are reviewed. Finally, the suitability of these MBAs for the future 5G massive MIMO wireless systems as well as the associated challenges is discussed.

Compact Tapered Slot Antenna Array for 5G Millimeter-Wave Massive MIMO Systems

A low-complexity metallic tapered slot antenna (TSA) array for millimeter-wave multibeam massive multiple-input multiple-output communication is proposed in this paper. Good beamforming performance can be achieved by the developed antenna array because the element spacing can easily meet the requirement of half-wavelength in the H-plane. The antenna element is fed by a substrate-integrated waveguide, which can be directly integrated with the millimeter-wave circuits. The proposed TSA is fabricated and measured. Measured results show that the reflection coefficient is lower than −15 dB Voltage Standing Wave Ratio ((VSWR) ≤ 1.45) within the frequency range from 22.5 to 32 GHz, which covers the 24.25–27.5-GHz band proposed by International Telecommunications Union (ITU) and the 27.5–28.35-GHz band proposed by Federal Communications Commission (FCC) for 5G. The gain of the antenna element varies from 8.2 to 9.6 dBi over the frequency range of 24–32 GHz. The simulated and measured results also illustrate good radiation patterns across the wide frequency band (24–32 GHz). A

A low cost W-band SIW bandpass filter

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The research of broadband MIMO millimeter wave transceiver system: Design and test

H-plane array integrated with the multichannel millimeter-wave transceivers on one PCB is demonstrated and excellent performance is achieved.

A broadband high efficiency Class-F power amplifier design using GaAs HEMT

In this paper, A W-band substrate integrated waveguide (SIW) filter is presented by using printed-circuit-board technology. The aggressive space mapping (ASM) optimization algorithm is adopted for designing the SIW bandpass filter. Fin line structure is proposed as the transition structure form SIW to waveguide. As demonstrations, A W-band SIW filter is fabricated on substrate RO5880 and measured by using VNA. Good agreements between simulated and measured results were obtained.

A dual-channel broadband millimeter-wave receiver front-end design for mobile communication

A design of broadband multiple-input and multiple-output(MIMO) millimeter wave transceiver system is developed in this paper. The millimeter wave(mm-wave) transceiver system includes the ultra-wide bandwidth baseband data processing unit (BAP), intermediate frequency module (IF), mm-wave frontend and the power module. The developed system can support 4×4 MIMO configuration. The mm-wave frequency of the transceiver is 28 GHz and the channel bandwidth is up to 500 MHz. The architecture adopts an intermediate frequency of 2.75 GHz, and the receiving link adopts digital intermediate frequency sampling. Meantime, the launch link uses a secondary frequency conversion structure. Link tests and system tests with the antenna arrays are conducted. The experiment results show that the developed system works well and provides hardware basis for future mm-wave broadband access applications.

An equivalent circuit perturbation method for machining deviation and yield analysis of Substrate Integrated Waveguide filters

This work reveals the design for broadband GaAs Class-F power amplifier employed in terminal applications. The approximated continuous Class-F mode was analyzed and applied to GaAs device. A harmonic matching network was used to realize a broadband fundamental load impedance match while the second and third harmonic impedance are kept inside the high-efficiency region on the edge of the Smith chart. The second harmonic source impedance was also matched to improve the efficiency. The amplifier was fabricated using a 1-W GaAs HEMT device, achieved a power added efficiency above 60% from 1.3-2.1 GHz, with output power greater than 30-31.77 dBm. The maximum power added efficiency and drain efficiency are 75.26% and 81.94% respectively. The amplifier also maintained a high drain efficiency over 50% at 8-dB power back-off point. A comparison shows that this amplifier exceeds other reported GaAs Class-F power amplifiers in terms of bandwidth while high output power and efficiency are maintained.

An RF self-interference cancellation circuit for the full-duplex wireless communications

The design of a dual-channel broadband millimeter-wave receiver front-end for the next generation mobile communication is presented in this article. The front-end operates at 28GHz with 2GHz and 500MHz bandwidth in radio frequency (RF) and immediate frequency (IF) respectively. A scheme of single downconversion is used and a compact substrate integrated waveguide (SIW) bandpass filter is designed to suppress the RF interferences out-of-band. The realized front-end obtains good RF performance from 27.75GHz to 28.25GHz. The measured conversion gain is greater than 27dB for both channels, while the flatness is below 0.8dB. The noise figure of the front-end is less than 4.5dB and an input third-order intercept point (IIP3) above -12.6dBm is achieved. An error vector magnitude (EVM) test is also performed across the bandwidth and the result shows excellent overall receiving performance of the proposed receiver front-end.

Digital Beamforming-Based Massive MIMO Transceiver for 5G Millimeter-Wave Communications

Substrate Integrated Waveguide (SIW) will play an important role in mass production of millimeter-wave systems due to the low-cost, mass-producible, compact characteristic and easy to integrate with other planar circuits. It is necessary to estimate the fabrication yield in mass production. However, yield analysis is an impracticable task for the full-wave simulation method due to large computational amount. This paper proposed an equivalent circuit perturbation method for rectangular SIW-cavity filters to achieve fast and accurate analysis of SIW filter with machining deviations. Based upon the Monte Carlo experiments, this method is applied to estimate the fabrication yield of a four square-cavity SIW filter at 28GHz. Moreover, measurements are carried out to obtain the actual performance of filters fabricated with standard PCB process.