涡旋电磁波轨道角动量模态抗干扰性能分析

The electromagnetic vortex wave has demonstrated excellent research value with potential applications in the fields of wireless communication and radar detection and imaging due to its unusual electromagnetic field distribution and theoretically infinite orthogonal Orbital Angular Momentum (OAM) modes. This study analyzes the anti-interference performance of OAM modes in the electromagnetic vortex Radio Frequency (RF) transceiver link primarily from the perspective of the electromagnetic vortex field distributions in space and the OAM modes orthogonality. Planar antenna arrays are designed to generate the electromagnetic vortex beams with respective OAM modes of and in the C band, and the corresponding RF transceiver links are established. The OAM modes’ anti-interference properties under different interference situations are analyzed in the electromagnetic vortex RF transceiver link by using a horn antenna as the interference source. Meanwhile, the corresponding OAM mode spectrum and the OAM modes’ orthogonality are employed as the primary methods in our analysis. Finally, the designed antenna models are fabricated, and the electromagnetic vortex RF transceiver links are measured. The corresponding analyses and conclusions are presented in this study. The OAM modes’ anti-interference performance analysis in the vortex electromagnetic wave’s RF transceiver link can provide a reference for exploring and designing a vortex electromagnetic wave in wireless communication and radar detection and imaging research.      

Analysis and design of a frequency-hopped spread-spectrumtransceiver for wireless personal communications

Personal communications services (PCS) require low-power radio technologies. One such transceiver architecture employing frequency-hopped spread-spectrum techniques is presented. System features such as antenna diversity with equal-gain combining and sequential hop combining are incorporated into the transceiver design to achieve robust wireless digital data transmission over fading channels. A direct-conversion architecture from radio frequency (RF) to baseband reduces the overall power consumption by eliminating intermediate frequency (IF) components. High-rate frequency hopping with frequency-shift keying (FSK) modulation is implemented using a direct digital frequency synthesis technique. A multiplierless correlation FSK detector, suitable for direct-conversion receivers, has been designed for quadrature noncoherent detection. Robust acquisition algorithms based on energy detection and pattern matching and tracking architectures using digital phase-locked loops are also described for system synchronization. The proposed transceiver is well-suited for low-power PCS applications and other portable wireless communications     

An LTCC-Based Wireless Transceiver for Radio-Over-Fiber Applications

This paper describes the realization of a low-temperature co-fired ceramic (LTCC)-based wireless transceiver with optical interface for radio-over-fiber applications involving several standards. The RF front-end including an antenna is fabricated in LTCC technology, while the optical transceiver with a single-mode optical interface is built on a silicon motherboard. The front-end operates in the 5-6-GHz band, while the modulated optical carrier is transmitted at 1.55-mum wavelength. The front-end module is an attractive solution for wireless local area network applications such as IEEE 802.11a or HIPERLAN2 requiring a direct link to an optical backbone     

A 60-GHz point-to-multipoint millimeter-wave fiber-radio communication system

A 60-GHz point-to-multipoint wireless access link with data rate of 156 Mb/s incorporating 60-GHz transceiver modules and full-duplex fiber-optic millimeter-wave transmission is developed for short-range applications such as indoor wireless local area networks and intelligent transport systems. For compact system configuration, a small-size millimeter-wave transceiver module with planar antennas is developed. The transceiver module is based on broadband planar integration and packaging of millimeter-wave circuits. The RF output power is +10 dBm and the measured 3-dB antenna beamwidth is 30/spl deg/. The total size of the developed 60-GHz transceiver module, except input and output connectors, is 50 mm /spl times/ 75 mm /spl times/ 35 mm. A point-to-point full duplex fiber-optic configuration is extended to the scheme with multiple access points (APs) by using a tree coupler and a dense wavelength division multiplexing multiplexer. The AP has a simple configuration without frequency conversion. The bit error rate and packet error rate performances of the 60-GHz fiber-radio access link are evaluated. Furthermore, the effect of the extension to the scheme with multiple APs is investigated.     

A 1 V Wireless Transceiver for an Ultra-Low-Power SoC for Biotelemetry Applications

This paper presents a 1 V RF transceiver for biotelemetry and wireless body sensor network (WBSN) applications, realized as part of an ultra low power system-on-chip (SoC), the Sensiumtrade. The transceiver utilizes FSK/GFSK modulation at a data rate of 50 kbit/s to provide wireless connectivity between target sensor nodes and a central base-station node in a single-hop star network topology operating in the 862-870 MHz European short-range-device (SRD) and the 902-928 MHz North American Industrial, Scientific & Medical (ISM) frequency bands. Controlled by a proprietary media access controller (MAC) which is hardware implemented on chip, the transceiver operates half-duplex, achieving -102 dBm receiver input sensitivity (for 1E-3 raw bit error rate) and up to -7 dBm transmitter output power through a single antenna port. It consumes 2.1 mA during receive and up to 2.6 mA during transmit from a 0.9 to 1.5 V supply. It is fabricated in a 0.13 mum CMOS technology and occupies 7 mm² in a SoC die size of 4 times 4 mm².     

W波段64通道相控阵微系统设计与实现

相控阵微系统的主要特征是电路与天线的高度融合集成,将三维微纳集成技术和微电子技术紧密地结合在一起,切合相控阵高频化、小型化和低成本的发展需求。本文设计了一款W波段的封装天线相控阵微系统,该相控阵采用硅基三维集成的方式将T/R多功能芯片、天线阵列集成在一个微系统模块中,并详细介绍了基于硅工艺的多功能收发芯片设计和相控阵封装天线设计。给出了相控阵微系统的测试结果。该微系统具有高集成度、高性能、低成本的特点,可以为高速无线通信、高精度探测和成像等应用提供一个较优的技术路径。     

无线收发器双频ICPA的FDTD分析

高集成无线收发器的集成电路封装天线（Integrated—Circuit Package Antenna，ICPA）需要同时工作在：2．4GHz和5．25GHz的双频段上。它将微带贴片天线和射频收发器集成于一个独立的封装内，并使天线和收发器之间的电磁干扰最小。利用基于非均匀网格的时域有限差分方法（nonuniform Finite—Difference Time—Domain，nu-FDTD）对ICPA进行建模和仿真，并分析了设计参数对ICPA的影响以及ICPA的频率特性、远场辐射方向图和电磁场分布等。经过优化，ICPA天线可以准确地工作在双频段上。     

智能天线技术及应用研究评述

智能天线是提高无线传输性能的一项关键技术,是无线通信领域持续的研究热点之一,其中部分研究成果已经在无线通信、雷达、电子对抗等广泛的领域获得了成功的应用,并且未来无线系统设计中会越来越多的采用智能天线技术.为此,文章首先简要回顾了有关智能天线技术的发展历史,介绍了其中主要的阵列处理算法原理,给出了基于软件无线电和FPGA/DSP等可重配置软硬件系统设计参考方案,通过一些设计实例分析了应用中的实际问题和解决途径,最后提出了有关这一技术领域未来发展的展望.     

Power Equations and Capacity Performance of Magnetic Induction Communication Systems

Although a number of studies have been done on the traditional Radio Frequency (RF)terrestrial communication system, the potential applications and the advantages of Near-Field magnetically coupled coils in wireless short range communications is just emerging and is yet to be explored. This paper investigates the impacts of magnetically coupled transceiver antenna coil on the received signal power and the communication link capacity. Based on the equivalent circuit model in free space, theoretical foundations are laid with observed simulation results. The simulation result benefits the antenna designers and the network planning engineers to estimate the power at the receiver and a near field magnetic communication system capacity for different antenna coil characteristics and different communication ranges.     

UWB for multi-gigabit/s communications beyond 60 GHz

The recently allocated 71–76 GHz and 81–86 GHz bands provide an opportunity for realizing Line Of Sight (LOS) links for directional point-to-point “last mile” applications. An efficient use of this spectrum may allow wireless to finally “catch up” with wires, leading to systems such as “multi-Gigabit wireless Ethernet,” and “wireless fiber.” However, the transmission at such a frequency range is characterized by several additional challenges compared to lower frequency bands, from both technological and propagation point of view, which makes difficult to use them efficiently. In this scenario, IR (Impulse Radio) UWB (Ultra Wide Band) technology might offer some more degrees of freedom for the design of a highly integrated and low cost transceiver. This work has at its core the design and BER (Bit Error Rate) performance evaluation of an IR-UWB architecture based on an 85 GHz up-conversion stage of train of Gaussian pulses having duration lower than 1 ns. Finally, we compare performance of this architecture with the ones of a more traditional continuous wave communications system with FSK (Frequency Shift Keying) modulation. Simulation results show that BER performance, in presence of RF non-linearities, for an IR-UWB transceiver architecture operating at 85 GHz (with same data rate and bandwidth) are better than a coherent BFSK scheme working in a similar scenario. Finally, some conclusions are reported, pointing out the UWB antenna design and the future works related to the modeling of the channel at frequencies beyond 60 GHz and the implementation of the test bed.     

双频贴片天线研究与设计

无线通信的发展对天线(尤其是贴片天线)的各项性能提出了新的要求。与此同时，双频天线的应用也愈为广泛。总结了贴片天线的主要双频解决方案，包括正交模、多贴片、电抗性加载以及空气缝隙双频贴片等方式，并提出了相应双频贴片天线的适用场合。最后，结合HFSS仿真设计了一个双频双贴片天线，讨论了该天线特性，并对双频天线未来的发展趋势进行了展望。     

A low-power monolithic CMOS transceiver for 802.11b wireless LANs

A single-chip low-power transceiver IC operating in the 2.4 GHz ISM band is presented. Designed in 0.18 μm CMOS, the transceiver system employs direct-conversion architecture for both the receiver and transmitter to realize a fully integrated wireless LAN product. A sigma-delta (∑△) fractional-N frequency synthesizer provides on-chip quadrature local oscillator frequency. Measurement results show that the receiver achieves a maximum gain of 81 dB and a noise figure of 8.2 dB, the transmitter has maximum output power of-3.4 dBm and RMS EVM of 6.8%. Power dissipation of the transceiver is 74 mW in the receiving mode and 81 mW in the transmitting mode under a supply voltage of 1.8 V, including 30 mW consumed by the frequency synthesizer. The total chip area with pads is 2.7×4.2 mm2.     

A 5-GHz-band multifunctional BiCMOS transceiver chip for GMSKmodulation wireless systems

This paper reports the first multifunctional 0.4-μm BiCMOS-based transceiver chip developed for 5-GHz-band Gaussian minimum-shift keying modulation wireless systems. The chip integrates a low-noise radio-frequency amplifier, a down-mixer, and an intermediate-frequency (IF) amplifier in the down-converter path; an IF amplifier, a limiter, an up-mixer, and a buffer amplifier in the up-converter path; and a frequency doubler and a local oscillator amplifier in the local oscillator path. The chip featuring gain attenuation as well as standby mode operation uses a single 2.6-5.2-V bias voltage and dissipates 56 mW in receive mode and 66 mW in transmit mode. The transceiver chip size is 3.0×2.4 mm²     

FET-based planar circuits for quasi-optical sources andtransceivers

The circuits that are simple in construction and exhibit isotropic conversion gain are discussed. Both single-device and balanced transmitter and transceiver circuits are described. Balanced sources are presented that can be operated in push-pull mode for frequency doubling. A single-FET quasi-optical oscillator circuit using a microstrip patch linear array and having an effective radiated power of 31.6 dBm at 10 GHz is reported. A dual-FET frequency-doubling oscillator circuit using a coupled rampart line antenna with an effective radiated power of 21.6 dBm at 19.7 GHz is also described. Quasi-optical transceiver elements are presented that use the FETs as both signal sources and self-oscillating mixers for down-conversion of the received signal. The application of these transceiver elements to Doppler motion detection is reported     

5.8GHz短距离无线收发系统的设计

详细介绍了一个以应答芯片CHR2244为核心的5．8GHz短距离无线收发系统的设计方案。该设计将实现上行FM,下行AM的无线数据收发功能。对天线模块、射频收发模块和数据链路控制分别进行了的阐述,同时对通信过程也进行了详细的描述。     

Radiation Characteristics and Mutual Coupling of a Dual: Band Antenna Array Structure

In this paper, an antenna array structure consisting of a reflector plate and a number of printed dipole radiation elements is investigated. This antenna array implementation is suitable for the globally available 2.4 and 5?GHz ISM frequency band facilitating a variety of wireless applications. S-parameters and radiation characteristics are simulated and measured in details. The impact of the plane reflector on radiation patterns and the reflection coefficient are also investigated. Furthermore, mutual coupling effects between adjacent elements and the corresponding radiation patterns are studied for different antenna array configurations. Both simulated and measurement results are useful in antenna array design and antenna applications in wireless communications.     

A Low Power Fully CMOS Integrated RF Transceiver IC for Wireless Sensor Networks

A fully CMOS integrated RF transceiver for ubiquitous sensor networks in sub-gigahertz industrial, scientific, and medical (ISM)-band applications is implemented and measured. The integrated circuit is fabricated in 0.18-mum CMOS technology and packaged in leadless plastic chip carrier (LPCC) package. The fully monolithic transceiver consists of a receiver, a transmitter, and an RF synthesizer with on-chip voltage-controlled oscillator. The chip fully complies with the IEEE 802.15.4 wireless personal area network in sub-gigahertz mode. The cascaded noise figure of the overall receiver is 9.5 dB and the overall transmitter achieves less than 6.3% error vector magnitude for 40 kb/s mode. The chip uses 1.8-V power supply and the power consumption is 25 mW for reception mode and 29 mW for transmission mode     

Investigation of the antenna characteristics with the impact of hexagonal metamaterial

Antenna miniaturization is a typical trend in contemporary wireless systems, notably for current wireless technology, to meet multiband needs while preserving high transmission qualities. The terahertz (THz) regime is helpful in advanced applications and significantly impacts wireless technology. This paper proposes a double-layered hexagonal split ring resonator (HSRR) based on a microstrip patch antenna (MPA) and analyzes the simulated characteristics. The HSRR width is varied for different thickness “w” values and compares the analysis of with and without HSRR in the antenna. Due to the impact of metamaterials, the optimized antenna produces −44.02-dB return loss, 1.012 voltage standing wave ratio (VSWR), 6.47-dBi gain, and 4.78-dB directivity at 1.8-THz frequency. This proposed antenna is suitable for THz applications, which include high-speed data rate in wireless communication, bio-medical field, and THz spectrometer.     

Diversity Antenna Design for Wireless Alarm Networks

Printed circuit board antennas degrade considerably when the wireless node is placed on or near metallic surfaces. One such application is wireless alarm network where nodes are placed on a metallic fence. As wireless transmission is regarded as the most expensive operation in terms of sensor node energy, it is more than a necessity to have a good antenna design. We simulate the performances of typical printed circuit board (PCB) antennas with proximity to metallic fence and simulations show that traditional antenna structures exhibit poor performance for these applications. Instead, we propose a low-cost two-antenna diversity system that utilizes two PCB antennas with different radiation pattern coverage. Antenna diversity by means of radio frequency switches was implemented for two configurations: single state antenna selection and equal-gain diversity combination. Diversity gains were calculated for free-space and over-the-fence operating conditions, and the best antenna configuration is suggested for practical applications.     

Millimeter wave wireless interconnects in deep submicron chips: Challenges and opportunities

On-chip wireless links offer the most promising solution to improve performance over traditional Networks-on-Chip (NoCs). Though, significant advancements are being made to support intra-chip wireless communication, a complete understanding of on-chip wireless channel, that facilitates design optimization of transceivers and antennas is still lacking. In this work, we derive on-chip wireless channel characteristics, taking into account antenna implementation, near field and multipath propagation effects. These observations are then used to study impact on wireless NoC performance, packet energy, delay and bandwidth. The study provides crucial insights for circuit designers to tune transceiver and antenna specifications to achieve desired network performance.