互补传输线实现小型化平面巴伦

应用一种新型的互补传输线Complementary-Conducting-Strip Transmission Line(CCS TL)实现了简单 结构的平面无耦合巴伦(balun),在保证性能的前提下极大地缩小了电路尺寸,便于紧凑化集成。整个电路在0. 127 mm 厚度的Arlon 880 基片上实现,平面面积为8mm伊6mm,约占传统微带线实现相同电路面积的五分之一。电路的 中心频率为7. 5GHz,带宽为40%(6GHz-9GHz),带内各端口回波损耗在-10dB 以下,平衡端口隔离度在-15dB 以 下,平衡端口输出幅度不平衡度在依0. 5dB 以内,实测结果符合理论预期。     

微带传输线的特性研究

本文提出一种计算微带传输线的新方法,它是从场匹配出发,通过引入傅里叶变换建立了谱域中SLE和SLM模的等效电路。运用普通的传输线理论可导出所需要的特征方程。与谱域导纳法相比,这种方法物理意义明确并具有普遍性。     

直线法分析超导微带传输线

本文首次应用直线法结合二流体模型对超导微带传输线进行了分析。针对多层介质结构和普通结构，分别计算了衰减特性、色散特性以及特性阻抗。结果表明超导微带线比普通导体微带线具有更好的性能，如低损耗、低色散和较小的电路尺寸。与已发表的文献相比较验证了本文方法的可行性。     

基于左手传输线的宽带巴伦设计

提出了一种基于左手传输线的新型Wilkinson巴伦,该巴伦由一个Wilkinson功分器和两条相位响应相差180°的相移 线构成,它具有结构紧凑和宽频带的特点。采用陶瓷基板薄膜加工工艺,制作了一个工作于C波段的Wilkinson巴伦。最后 测试结果显示：从4GHz到6GHz的频率范围内,输入端反射系数|S11|和输出端隔离|S23|均小于-15dB,两输出端口幅度和相 位不平衡性小于0.3dB和±2°,输出端插入损耗|S21|和|S31|大于-4dB。     

微带传输线特性的数值分析

本文应用混合模有限元方法分析和计算了微带传输线的各种特性,包括特性阻抗、速度比、色散特性以及带厚的影响,并与有关文献结果作了比较。结果表明,有限元法是对微带传输线进行数值分析的有效方法。     

屏蔽类微带传输线准静态特性的有限元分析方法

本文建立了有限元法分析屏蔽类微带传输线的通用程序。以屏蔽悬置微带线为例,计算了其准静态特性参数,并与用变分法的计算结果进行了比较,两者吻合很好,表明了本文编制的有限元法分析程序的正确性。     

1-18GHz微带巴伦双平衡混频器

本文介绍了一种微带巴伦多倍频程微波集成双平衡混频器。它是由宽带微带巴伦和二极管电桥组成。这种微带巴伦双平衡混频器显示了良好的噪声特性和隔离特性。在1-18GHz工作频率范围内,最大双边带噪声系数为8.7dB,平均双边带噪声系数约6dB;本振端一信号端、本振端一中频端隔离度均大于15dB。     

宽频带微带天线阵

本文提出一种用聚苯乙烯泡沫支撑的高效宽频带微带天线阵。给出了这种天线阵的分析、设计方法。理论和实验结果表明能够得到高达６０％的频带宽度。     

传输线巴伦的制作与测试

业余无线电通信中常用到的巴伦，主要指的是同轴电缆向天线馈电时所需要的不平衡到平衡的变换器，英文是Balance—Unbalance，缩写为一个新词：Balun，音译为巴伦。     

耦合微带线设计的一种实用方法

本文根据耦合微带线的某些特性,提出了耦合微带线设计的一种实用方法.     

Sharp-rejection microstrip bandpass filters with multiple transmission zeros

A simple design of a sharp-rejection microstrip bandpass (BPF) filter is presented. By creating multiple transmission zeros in the lower and upper stopbands, sharp rejection characteristics are obtained. The basic filter unit consists of a single parallel coupled-line section and an open-ended stub. A lossless transmission line model approach is used to derive the design equations for frequency responses and transmission zero positions. The bandwidths are controllable by the zero locations that in turn are controlled by varying the impedances of the configuration. To validate theoretical predictions, two prototype BPFs operating at lower band 2.4 GHz of WLAN are fabricated in microstrip form.     

Design and validation of miniaturize Rat Race Coupler based microstrip Balun

This work presents a compact Balun with enhanced bandwidth and better isolation between output ports using Interdigital Capacitor (IDC). Firstly, a Rat Race Coupler (RRC) is designed, later Balun is proposed by replacing the isolation port with a 50 Ω isolation resistor. The proposed Transmission line (TL) is designed using an IDC in parallel with a high impedance TL. Based on a π-equivalent circuit the proposed TL has been investigated and optimized to achieve 70.7 Ω impedance. The Balun is designed and fabricated. The simulated and fabricated results are in accord. The fractional bandwidth (FBW) of RRC and Balun are 37.5% and 33% respectively at centre frequency 2.4 GHz. The size occupied by the proposed Balun is 0.51λ_g × 0.22λ_g. The structure is low cost, uniplanar and compact.     

Wide range suppressed harmonic response compact microstrip balun

In this paper, simple shunt open-stub units are used to design a compact balun with suppressed harmonic response. The stopband response of shunt stubs has been utilized to suppress the harmonic passbands. Design guidelines are presented with equations and graphs based on transmission line model. To validate theoretical predictions, an experimental prototype microstrip balun, with suppressed harmonic passbands up to six times the operating frequency, and occupying only 25% of the conventional balun circuit area is presented.     

Co-design of a wideband double-balanced active mixer and transformer-based baluns for 77 GHz radar applications

This paper presents a 130-nm BiCMOS active mixer dedicated to 77 GHz automotive radar applications. The architecture is based on a double-balanced Gilbert cell with integrated transformer-based baluns. Interconnections between devices, capacitor accesses and Tee-junctions are modeled using EM software in order to improve the simulation accuracy. Focusing on wideband operation, the transformer-based baluns are considered as part of the input matching network. Sizing of the transformer is detailed along with its amplitude and phase balance performances. The design of the input matching circuit integrating the transformer is presented, providing a 12-GHz bandwidth. Measured noise figure, conversion gain and compression point of the mixer are displayed and compared to the state of the art.     

CHARACTERISTICS OF MICROSTRIP TRANSMISSION LINES

An efficient hybrid field solution to microstrip transmission lines is presented byusing SLE and SLM modes in spectral domain.It by-passes the lengthy process of formulatingthe determinant equation for the unknown propagation constant.Compared with spectral domainadmittance approach,this method is clear in both physical and mathematical senses and may beapplied to a variety of structures.     

一种工作于4GHz的正方形微带巴伦设计

传统结构巴伦是一端开路的对称四端口网络,在奇偶模分析的基础上,对传统的巴伦结构进行改进,设计了一种工作于4GHz的正方形微带巴伦。利用HFSS进行仿真分析,并加工成实物。测试结果表明,在3.7 ~ 5GHz范围内,|S11|小于-10dB;在工作频段内,|S21|与|S31|均大于-4dB,S21与S31之间的相位差在178度到183度范围内。该巴伦结构简单、实现成本较低,可应用于无线局域网、射频识别等领域。     

A wideband balun–LNA

In this paper a wideband Low Noise Amplifier (LNA) is introduced which also converts the single-ended input to differential signal at the output. It is based on common-source amplifier with active-feedback to provide input matching. The proposed amplifier has the input matched from 500 MHz to 2.5 GHz. It achieves the maximum voltage gain of 24 dB in this band, while the minimum noise figure (NF) is 2.35 dB. The simulated OIP3 of this amplifier is equal to 21 dBm. The LNA has been designed and simulated in a 0.18 μm CMOS process.     

FDTD中微带线激励源设置的新方法

ＦＤＴＤ已广泛应用于微带问题的计算中,本文提出了一种新的微带线馈电激励设置方式,同以往的激励设置方法不同,它不仅能计算Ｇａｕｓｓｉａｎ脉冲激励也能计算正弦波激励,计算过程中,源平面无需切换成吸收边界,场区的划分使反射场自然从总场区分离出来。     

Decoupling between two conductor microstrip transmission line

A numerical analysis of two-conductor transmission line with a rectangular notch in the dielectric between the strips is presented. Three media integral equations are derived and solved for the charge distributions. The decoupling between such two-conductor coupled microstrip transmission lines is investigated for asymmetric conductors. It is found that the coupling between two conducting lines can be reduced significantly by removing dielectric material between the lines which has a rectangular shape. For best decoupling, the width should be as wide as possible between the conducting lines but the depth should have an optimum somewhere in the base dielectric substrate