Millimeter-Wave Ultra-Wideband Bandpass Filter Employing Dual-Mode Ring Resonators Fed by Step-Impedance Coupled Lines

This paper presents a novel millimeter-wave ultra-wideband (UWB) bandpass filter (BPF) based on microstrip dual-mode rectangular ring resonators. In order to get strong coupling between the input/output line and the dual-mode ring resonators, a step-impedance parallel-coupled structure is adopted for the design of the filter. On the other hand, transmission zeros are produced by the dual-mode resonator. As a consequence, the filter has low insertion-loss in its passband, sharp attenuation in its lower and upper stopbands and very wide stopbands. As an example, a filter with two dual-mode ring resonators is designed and fabricated. The measured frequency property of the fabricated filter shows good agreement with the simulated response.     

5G毫米波射频算法技术研究

5G毫米波射频系统的高频段大带宽特性,以及采用的混合赋形架构实现硬件链路,对系统射频算法方案的实现开发形成挑战,比如针对大带宽新空口基带信号的消峰算法,混合赋形架构下模拟链路的非线性校正,以及通道一致性校准等,从而对5G毫米波系统的功能实现、性能优化和节能增效产生重要影响。从5G毫米波相对低频设备的系统架构变化出发,总结分析了毫米波系统射频算法技术的性能影响因素和技术瓶颈,提出了毫米波射频算法技术发展方向建议。     

基于CAN总线的毫米波跟踪雷达信号处理机通信接口板卡的设计

毫米波跟踪雷达系统工作时,有大量数据在信号处理机和计算机之间交换.因此需要一个稳定、抗干扰、可靠性高的通信网路,来确保信息传输的畅通.结合这些特点,本文设计一个采用CAN总线为信道的,雷达数字信号处理机接口的通信板卡.实现了对雷达采样信号传输的低误码率和处理的实时性.     

Wideband Hybrid Array Concept for Millimeter-wave Applications

The use of circular waveguide radiators electromagnetically coupled to a stripline distribution network is proposed in this work as wideband hybrid array configuration suitable for millimeter-wave applications. The adopted excitation mechanism avoids the use of transition components from stripline to radiators, which are responsible for loss mechanisms affecting similar configurations in literature. The effectiveness of the hybrid approach is first validated on a reduced frequency X-band prototype. Then, a Ka-band array design is presented and experimentally tested to prove the wideband radiation behavior. A radiation efficiency of about 60 percent is also demonstrated on the Ka-band prototype.     

Design considerations for a higher-order-mode dielectric-loaded power extractor set for millimeter-wave generation

The design of an electron-beam excited device for millimeter-wave generation is presented. Referred to as a dielectric-loaded power extractor, it is based on the higher-order-mode operation of a dielectric-loaded waveguide. With a matching transition, the unit can deliver power to the output waveguide at one of two frequencies, 20.8 and 35.1 GHz, corresponding to the TM₀₂ and TM₀₃ modes, respectively. By properly choosing the thickness of the dielectric lining, both modes are tuned to synchronize with an ultra-relativistic electron beam traversing the unit so that the wakefield generated by the beam is excited at these modes, chosen to be at 20.8 and 35.1 GHz, respectively, both corresponding to a harmonic of the 1.3 GHz operating frequency at an accelerator facility. Power generated in the unintended TM₀₁ mode is effectively suppressed for bunch train operation by a novel technique. The device consists of a dielectric-loaded decelerating structure and two changeable output couplers to deliver the millimeter-wave power to a standard waveguide. For a drive beam with 50 nC of charge per bunch, power levels of 90.4 and 8.68 MW are expected to be delivered by the device at 20.8 and 35.1 GHz, respectively.     

超宽带毫米波LTCC 收发前端设计

本文介绍了一种毫米波超宽带LTCC 收发前端的方案设计。通过分析组件的各项指标,选取合适的芯片,优化系统设计方案。在方案的基础上完成电路仿真设计。在18-40GHz 的范围内仿真结果较好地满足了设计指标要求。     

Accurate measurement of millimeter-wave attenuation from 75 GHz to 110 GHz using a dual-channel heterodyne receiver

A dual-channel millimeter-wave attenuation measurement system from 75 GHz to 110 GHz using a heterodyne receiver is described. The millimeter-wave attenuation is derived from the voltage ratio at 5.02 kHz using an inductive voltage divider as a reference standard. The measurement uncertainties are estimated to be 0.015–0.030 dB for attenuation ranging from 0 dB to 70 dB at 110 GHz. Measurement results of a waveguide rotary vane attenuator with 0–70 dB attenuation steps at 110 GHz are presented.     

基于三导体耦合线的毫米波Marchand balun建模与设计

本文提出了一种基于三导体耦合线结构的毫米波Marchand巴伦的新型宽带模型。基于c模和π模理论,对三导体耦合线进行了分析并采用传输线和理想变压器对其建立了模型。通过电磁场仿真提取了模型参数并使用该耦合线模型建立了Marchand巴伦的模型。基于该模型,本文使用GaAs工艺设计了一种毫米波Marchand巴伦并进行了流片制造,所设计的巴伦工作在15GHz~55GHz频率范围,测试结果表明该巴伦具有较好的幅值和相位平衡度,同时验证了模型的准确性。     

（英）CMOS毫米波低功耗超宽带共栅低噪声放大器

本文陈述了一个基于单端共栅与共源共栅级联结构的超宽带低噪声放大器(LNA)。该LNA用标准90-nm RF CMOS工艺实现并具有如下特征：在28.5到39 GHz频段内测得的平坦增益大于10 dB;-3 dB带宽从27到42 GHz达到了15 GHz,这几乎覆盖了整个Ka带;最小噪声系数(NF)为4.2 dB,平均NF在27-42 GHz频段内为5.1 dB;S₁₁在整个测试频段内小于-11 dB。40 GHz处输入三阶交调点(IIP3)的测试值为 2 dBm。整个电路的直流功耗为5.3 mW。包括焊盘在内的芯片面积为0.58*0.48 mm2_。     

Development of Millimeter-Wave Radio-over-Fiber Technology

Millimeter-wave radio-over-fiber technology demonstrates the potential for providing wireless broad-band service in the next generation wireless communication system.Optical generation of millimeter-wave signal is one of the most important technologies of millimeter-wave radio-over-fiber system.The virtues and shortcomings of some ways of optical generation of millimeter-wave signal are discussed.Then optical millimeter-wave signal transmission performance is described.Finally,an overview of the millimeter-wave radio-over-fiber system is given.It is suggested that the millimeter-wave radio-over-fiber technology should be paid more attention,especially for modulators for optical generation of millimeter-wave signal and radio-over-fiber system.