S波段基于微带抽头发夹型双工器设计

介绍了可应用于无线移动通信中的双工器的设计原理和方法。该双工器采用微带抽头发夹型结构,由两个窄带带通滤波器(BPF)通过适当的匹配电路组成。给出了这两个带通滤波器的详细设计步骤,介绍了抽头线位置等的确定方法,提高了抽头线发夹型滤波器设计初始值的精确度。设计仿真结果与实际测量结果吻合良好。     

较宽通带对称双工器的直接设计法

本文给出了较宽通带对称双工器的直接设计方法.基于同一个低通原型滤波器的两个带宽相同但中心频率不同的带通滤波器,根据本文给出的直接计算公式调整其部分元件值后可直接连接得到性能良好的双工器.     

一种Ku频段机载同轴双工器设计

为实现Ku频段双工器的小型化,以便适于对体积和重量有严格要求的机载环境使用,提出了一种Ku频段机载同轴双工器设计方法.该方法使用两个同轴带通滤波器构成双工器实现小体积,采用等效电路对带通滤波器进行设计,采用群时延拟合法利用仿真软件对T型接头尺寸进行优化设计,并给出了详细设计过程.实物测试结果表明,所设计的Ku频段同轴双工器体积仅为70 mm×29 mm×12 mm,插损小于0.9 dB,隔离大于80 dB,已在多个工程中得以应用.     

耦合谐振带通滤波器带外特征及应用

耦合谐振带通滤波器在通信系统的设计过程中起着至关重要的作用.通过分析带通滤波器的设计原理,给出具体耦合谐振带通滤波器的设计实例,比较了电感耦合与电容耦合带通滤波器带外特性的区别.通过利用电感耦合与电容耦合带通滤波器带外特性的这一区别,可以使双工器的设计结构更加简单,实现更加方便,性能更加优越,同时可以使利用更少阶数,更简单的结构设计出性能指标相同的带通滤波器.     

C/S波段低损耗LTCC双工器小型化设计

设计了一种基于低温共烧陶瓷(LTCC)工艺的小型化低损耗双工器。该双工器采用经典的LC结构,由S波段低通滤波器(LPF)和C波段带通滤波器(BPF)组成。在两路滤波器分支中加入串联及并联谐振形成传输零点来增加两个通带的抑制。经过电磁仿真优化,实际加工双工器的测试结果与软件仿真结果吻合。其中低通端插损小于0.35 dB,高通端插损小于0.6 dB,且在要求的频段内有着较好的抑制。该小型化双工器已在一些WLAN模块中得到应用。     

一种识别雷达用半集总参数LTCC双工器

介绍了一种基于低温共烧陶瓷(LTCC)工艺研制而成的小型化半集总高隔离度双工器.该双工器由L波段集总参数低通滤波器和X波段阶跃阻抗( SIR)分布参数带通滤波器组成.通过电磁仿真软件的仿真优化,实际加工滤波器的测试结果与软件仿真结果吻合.其中低通滤波器1dB截止频率为1.46GHz,带通滤波器中心频率为8.3GHz,1dB带宽为0.6GHz,通带内插损小于3.5dB,X波段端口对L波段端口隔离度大于60dB.该小型化LTCC双工器已成功应用于某毫米波战场识别系统的T/R组件中.     

一种X波段同轴双工器设计

在具有有限传输零点的广义Chebyshev带通滤波器的综合理论基础上,根据计算出的耦合矩阵设计滤波器仿真模型,应用电磁仿真软件结合最优化方法,采用群时延拟合法对双工器的尺寸进行优化设计.实物测试结果表明,双工器的插入损耗≤1.5 dB,输入输出电压驻波比≤1.5,带外抑制大于85 dB,得到的实测曲线满足设计要求,论证了该方法的正确性.     

Ku波段波导型双工器的研制

采用高精度的模式匹配法设计了一种Ku波段波导型双工器。双工器采用H面T接头和E面横向膜片波导带通滤波器。采用该方法设计的双工器精度高，结构简单，便于加工。文中也将理论结果和实测数据进行了比较，两者吻合得很好，证明了模式匹配法的精确性和有效性。     

一种连续通带宽带双工器的研制

设计并制作了工作在2.2～2.8GHz的带状线结构3dB定向耦合器和2只通带分别为2.2～2.5GHz及2.5～2.8GHz的8阶微带发夹线结构带通滤波器,利用该耦合器和带通滤波器设计制作连续通带宽带双工器,并通过ADS进行仿真。由仿真结果可知,在2.2～2.8GHz双工器全频带内输入端口的反射系数S11均优于-17.00dB,通带2.2～2.5GHz带内插损S21最优为-2.09dB,通带2.5～2.8GHz带内插损S31为-2.53dB,其中两通带的交接点2.5GHz处插损约-6.5dB。实测结果与仿真结果基本吻合。     

一种用于卫星通信的高隔离全带宽线极化双工器

文中设计了一种Ku 频段新型全金属高隔离度线极化双工器,它由一个正交模耦合器(Ortho-mode Transducer,OMT)和两个不同频段的滤波器组成。OMT 采用非对称无隔膜形式,在保持结构紧凑的同时实现了全带 宽通信,具有优异的线极化特性。为抑制带外信号,提高双工器端口隔离度,上行链路通道采用了结构紧凑、损耗小 的消失模带通滤波器,下行链路通道采用结构简单的阶梯阻抗低通滤波器。测试结果表明,线极化双工器覆盖了卫 星通信上下行链路的全部带宽(上行:13. 75~14. 5 GHz,下行:10. 7~12. 75 GHz),在工作频段范围内反射系数小 于-15 dB,端口隔离度优于85 dB。     

Stub-tuned microstrip bandpass filters for millimeter-wave diplexer design

This letter presents a new design for microstrip bandpass filters and its application to a millimeter-wave diplexer. Basically, parallel-coupled microstrip lines are utilized for bandpass response and non-uniform open-circuited stubs are added to tune the bandwidth of the passband and improve out-of-band rejection. The designed filters are connected to make a diplexer, which can be used in a phased-array transceiver system operating in millimeter-wave range. The diplexer is designed to separate an input signal containing both 32GHz and 35GHz into two signals of 32GHz and 35GHz, respectively or to combine two signals at 32GHz and 35GHz into one signal.     

Semicircular Waveguide-Type Diplexers Used for the Millimeter Wave Waveguide Transmission System

A semicircular waveguide-type diplexer consisting of semicircular hybrids and high-pass filters as a band-splitting filter for millimeter-wave multiplexing-demultiplexing networks has been newly developed. The construction and the operating principles of the diplexer are described; the design method and the experimental results are also discussed. The branching characteristics for a diplexer for dividing the frequency band 43.4-86.8 GHz into two equal parts have proved tolerably flat, with the resulting branching loss amounting to as small as 1.2-1.4 dB. The total length for the experimental model is 1.17 m, which is one-half to one-third shorter than the conventional Michelson interferometer-type diplexer. It is concluded that the semicircular waveguide-type diplexer can be effectively used for millimeter-wave waveguide transmission system.     

Frequency Diplexing with Waveguide Bifurcations

A relatively simple form of microwave frequency diplexer consists of a waveguide E- or H-plane Y-junction terminated with baudpass filters in each of the two output ports. The E- or H-plane bifurcation, or zero-degree Y-junction, allows a compact diplexer design as shown in Fig. 1.     

A Hairpin Line Diplexer for Direct Sequence Ultra-Wideband Wireless Communications

A high performance hairpin line diplexer for the direct sequence ultra-wideband communication is designed and implemented. This microstrip diplexer is mainly composed of two hairpin line wideband bandpass filters and a tapped open stub. The design concept is proposed in detail and has been verified by the experimental results of the fabricated diplexer, including the two isolated wideband bandwidths of 3.1-5.0 GHz and 6.02-10 GHz, low insertion loss and high isolation. Experimental results also show a good agreement with the simulated results.     

A simplified CAD of millimeter-wave diplexer with E-plane T-junction and all-metal insert filters

An equivalent circuit theory design of a class of rectangular waveguide E-plane T-junction diplexer with E-plane all-metal insert filters is presented. Element values of equivalent circuit models of E-plane T-junction proposed in [1] are computed and approximated. The parameters of the filters designed by [2] are also given. By use of the network combining technique, the scattering matrix of the diplexer is obtained and optimized according to the diplexer specification with a novel objective function. The experimental results show a fairly good agreement with the computed results.     

Wideband High-Selectivity Diplexers Utilizing Digital Elliptic Filters

Design techniques and element value tables are presented for the construction of compact high-selectivity diplexers using digital elliptic component filters. A brief review of an applicable diplexer theory is given and the derivation and use of the element value tables are discussed. The tables provide values for component filters with an even number of branches n for n=4 through n=12 with a prototype ripple value corresponding to maximum diplexer input VSWR of approximately 1.26 to 1. For n=8, 10, and 12 branch filters, additional tables with permuted transmission zero orders are given. Test results for an n=6 branch experimental diplexer of 2.25 to 1 bandwidth are presented. The design and construction of this diplexer is described in detail and serves to illustrate the use of the element value tables and design procedures presented. Many practical construction and alignment suggestions are given which are useful in obtaining designs with good response characteristics. The experimental diplexer has crossover frequencies at 1.5 and 3.4 GHz and provides greater than a 50 dB isolation at frequencies 0.2 GHz from crossover. The diplexer has an input VSWR 相似文献   

一种简单的高温超导连续通带双工器设计

在双抛LaAlO3衬底上外延生长的钇系高温超导薄膜YBCO的基片上,设计并制作一个四级高温超导连续通带双工器（工作频率3.0～3.5GHz和3.5～4.0GHz）,与常规金属材料的双工器相比,体积减少3/4,插损减少2dB。在液氮温区77K时,测试结果为：通带内插损小于0.8dB,通带间带外抑制大于30dB通带中心频率。为近一步研制高温超导多工器提供了很好的借鉴,对将来高温超导信道化接收机系统的研究和设计具有重要的意义。     

一种新型高隔离四端口双工器设计

设计了一款基于微带线的高隔离的新型四端口双工器, 由两组中心频率不同的滤波器构成, 每一组滤波器包括相位分别为±90°的两个滤波器.相对于传统的三端口双工器, 得益于该双工器的新型四端口电路拓扑, 使得泄露信号经过两路传输后形成相位相差180°的信号, 最终相互抵消, 进而达到提高隔离度的目的.另外, 本设计所需要的180°移相由滤波器本身结构实现, 不需要额外的移相电路, 因而使得电路更加简单紧凑.为验证方法的有效性, 设计了一款工作在1.8 GHz和2.1 GHz的四端口双工器并进行了加工, 通过对双工器实物的测量, 在1.8 GHz和2.1 GHz的隔离度分别达到了50.9 dB和43.5 dB, 相对于传统三端口双工器分别提高了9.7 dB和12.8 dB, 显著提升了双工器的隔离度.     

毫米波双工器的精确优化设计

把改进遗传算法用于高性能毫米波双工器的优化设计,双工器采用Ｈ－面Ｔ－型结构和Ｅ－面膜片波导滤波器,用该方法设计了３只不同频段的双工器,并设计加工了１只毫米波波段的双工器,设计结果和实验数据吻合较好,证明了这种算法的精确性和有效性。