0.1 THz鳍线单平衡式基波混频电路研究

研究了一种基于石英基片的0.1 THz频段的鳍线单平衡混频电路,混频电路的射频和本振信号分别从WR10标准波导端口通过波导单面鳍线微带过渡和波导微带探针过渡输入,中频信号通过本振中频双工器输出。这是一种新型的混频电路形式,与传统的W波段混频器相比,混频电路可以省略一个复杂的W波段滤波器,具有电路设计简单、安装方便的特点。该电路使用两只肖特基二极管通过倒装焊工艺粘结在厚度为75 m的石英基片上,石英基片相对传统基板,可以极大提高电路加工精度。在固定50 MHz中频信号时,射频90~110 GHz范围内,0.1 THz混频器单边带变频损耗小于9 dB。     

一种U 波段鳍线单平衡混频器的设计

本文介绍了一种U 波段鳍线单平衡混频器的设计过程并给出了测试结果。混频器使用M/A-COM 公司的肖特基势垒二极管MA4E2037,整个电路制作在一块厚度为0.127mm 的RT-Duroid 5880 软基片上。射频端口采用鳍线过渡,本振端口通过波导-微带探针过渡,中频通过SMA 接头输出。测试结果显示,鳍线悬置微带线结构的混频器在本振为42 GHz, 射频在40～60GHz 范围内变化时,其变频损耗小于8.71 dB,本振到射频的隔离度大于25dB。     

基于LTCC技术的C频段星载接收机混频器

利用低温共烧陶瓷(LowTemperature Co-fired Ceramic,简称LTCC)技术,设计制作了一种可应用于C频段星载接收机的双平衡混频器。该混频器将射频和本振巴伦等无源器件集成在多层LTCC基板内,实现了电路的小型化、高集成度和高可靠性。测试表明,当射频输入为5.925～6.425GHz、本振频率为2.225GHz、中频输出频率为3.7～4.2GHz时,混频器的变频损耗≤9.3dB,P1dB为5.7dBm,本振到射频和本振到中频的隔离度分别为39.44dB和35.58dB。混频器的尺寸为40×22×1.92mm3。     

基于微带无源电路的宽带毫米波分谐波混频器

设计了一款基于微带结构的宽带毫米波分谐波混频器.混频器中引入了短路结构的宽带射频滤波器以及一个高性能本振-中频双工器,这些无源电路能够抑制空闲组合频率,同时为中频、射频以及本振信号提供合适的回路.测试结果表明,本文设计的毫米波分谐波混频器射频工作频率为27～48 GHz,中频工作频率宽至6 GHz.在整个工作频段内上、...     

基于微带无源电路的宽带毫米波分谐波混频器（英文）

设计了一款基于微带结构的宽带毫米波分谐波混频器。混频器中引入了短路结构的宽带射频滤波器以及一个高性能本振-中频双工器,这些无源电路能够抑制空闲组合频率,同时为中频、射频以及本振信号提供合适的回路。测试结果表明,本文设计的毫米波分谐波混频器射频工作频率为27～48 GHz,中频工作频率宽至6 GHz.在整个工作频段内上、下变频损耗均小于12.5 dB。当射频为33 GHz,中频为1 GHz时,上变频、下变频达到最小变频损耗分别为8.2 dB和7.5 dB。     

基于倒扣技术的K波段 CPW环形混频器

本文给出了一种应用在汽车防撞雷达前端的单平衡环形混频器。混频器设计中采用CPW线作为传输线,以降低传输损耗,并提出了一种新的混合环的分析方法。电路设计中重点考虑了在较低的本振功率的情况下获得较小的变频损耗。当本振在25GHz有9dBm的信号功率输入时,混频器有5. 2dB的变频损耗,本振到射频和本振到中频分别有46. 4dB和37. 7dB的隔离度。该混频器的结构简单,便于批量生产。     

太赫兹宽带分谐波混频器设计

太赫兹分谐波混频器的变频损耗、噪声系数等指标与基波混频器相近,且本振频率为射频频率的一半,大大 降低了本振源的设计难度和制作成本,是高性能太赫兹接收前端的关键部件。本文介绍了一种覆盖全波导带宽的太赫 兹宽带分谐波混频器的设计,对电路中射频波导至悬置带线过渡结构和本振中频双工器进行仿真和优化设计。并以 0.14~0.22THz 分谐波混频器为例进行设计和制作,测试结果表明0.14 ~0.22THz 分谐波混频器在全波导频段内最大变频 损耗低于15dB,中频3dB 带宽大于20GHz。     

太赫兹宽带分谐波混频器设计

太赫兹分谐波混频器的变频损耗、噪声系数等指标与基波混频器相近,且本振频率为射频频率的一半,大大降低了本振源的设计难度和制作成本,是高性能太赫兹接收前端的关键部件。本文介绍了一种覆盖全波导带宽的太赫兹宽带分谐波混频器的设计,对电路中射频波导至悬置带线过渡结构和本振中频双工器进行仿真和优化设计。并以0.14~0.22THz分谐波混频器为例进行设计和制作,测试结果表明0.14~0.22THz分谐波混频器在全波导频段内最大变频损耗低于15d B,中频3d B带宽大于20GHz。     

330 GHz高性能二次谐波混频器设计

采用反向并联肖特基二极管对设计了一种330 GHz二次谐波混频器。混频器电路采用微带结构,使用波导-微带探针耦合的形式进行过渡;采用50 μm厚的石英作为基板,有效减小了电路体积;采用HFSS和ADS对电路进行仿真和谐波平衡仿真。仿真结果显示,混频器在310~350 GHz范围内的变频损耗优于9.5 dB,所需本振(LO)功率为3 dBm,有效降低了对本振的要求。     

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。     

Wideband microstrip balanced mixer

A novel microstrip balanced mixer circuit has been developed with over 40% bandwidth. The circuit uses two coupling rings for RF and LO inputs. A conversion loss of less than 8dB has been achieved for the RF frequency swept from 13 to 23 GHz with an LO signal at 25 GHz.     

Dual-band rat-race coupler design using tri-section branch-line

The design of a novel rat-race coupler that can operate at two widely separated frequency bands is presented. The proposed circuit also features compact size, planar structure without a via hole, and low insertion loss. For validation, both simulated and measured performance of a microstrip rat-race coupler operating at 2.45/5.8 GHz are shown     

基于倒扣技术的Ka波段环形混频器

给出了一种应用在毫米波前端的单平衡环形混频器。该混频器采用高介电常数的复合材料(R ogersDuro id3010,rε=10.2),以获得较小的芯片面积;电路设计中重点考虑了在较低的本振功率的情况下获得较小的变频损耗,并给出了一种新的混合环的分析方法。当本振在36.5 GH z有9 dBm的功率输入时,混频器有7 dB的变频损耗,双边带噪声系数11.5 dB,本振到中频和射频到中频分别有40.5 dB和31 dB的隔离度。     

A five port hybrid ring mixer design

The design, construction and measured experimental characteristics of a Ka-band balanced mixer based on microstrip technology, are presented. The mixer was realised using a configuration of a rat-race hybrid with five ports and two GaAs beam lead Schottky diodes. This type of balanced mixer is advantageous because it avoids via holes, airbridges and crossing transmission lines that deteriorate the performance of the circuit, and make its construction more difficult. The circuit was constructed in uniplanar microstrip configuration, so the circuits pattern was defined on one side of the substrate only, using thin film techniques. Performance characteristics of the mixer are presented as a function of RF and LO power, RF frequency and voltage bias of the Schottky diodes.     

A Broadband Compact Microstrip Rat-Race Hybrid Using a Novel CPW Inverter

A new compact microstrip rat-race hybrid with an octave bandwidth employing a novel frequency-independent coplanar waveguide (CPW) phase inverter is reported in this paper. The 270deg branch of a conventional rat-race is replaced by a -90deg branch, which is realized by a 90deg microstrip line and the CPW phase inverter. A new microstrip-to-CPW transition is introduced for which a lumped-element model is devised to facilitate parameter optimization. The designed transition has an insertion loss less than 0.33 dB across the designed frequency band from 1.5 to 3.5 GHz. The footprint of the proposed design is reduced by 75% and shows almost 60% and 80% enhancements in the 0.5-dB mismatch bandwidth of amplitude and 10deg mismatch bandwidth of phase, respectively, when compared with the conventional implementation. The proposed hybrid can be fabricated using a conventional printed-circuit and plated thru-hole technologies     

K-Band Integrated Double-Balanced Mixer

A novel microwave integrated circuit (MIC) double-balanced mixer with good isolation between the three ports is described. The mixer is fabricated using a combination of microstrip lines, slotlines, and coupled slotlines, together with four beam-lead Schottky-barrier diodes. The K-band magic-T has been developed for the double-balanced mixer. The minimum conversion loss measured at a signal frecuency of 19.6 GHz is 4.7 dB. Isolation between RF and LO ports is greater than 20 dB from 18 to 21 GHz. The mixer can be expected to have wide applications in MIC receivers and transmitters up to the millimeter-wave band.     

A dual-beam asymmetrically scanning leaky-wave antenna by utilizinga HEMT resistive upconverter

A dual-beam asymmetrical scanning microstrip leaky-wave antenna (LWA) has been demonstrated in this paper. A HEMT resistive upconverter output is connected to one terminal of the LWA, and a local oscillator (LO) signal is connected to the other terminal. In this experiment, we set the LO frequency at 9.5 GHz so that the right beam is fixed at 48°. By changing the IF frequency from 0.7 GHz to 1.5 GHz, the module of the LWA can steer the left main beam of the far-field pattern from 136° to 158° (the total scanning angle of 22°). Comparisons between the measured and theoretical results indicate that the design can achieve the asymmetrically scanning capability and agree well over the tuning bandwidth of 0.8 GHz     

An Improved Architecture of Sixth Subharmonic Mixers in E-Band

An improved architecture of sixth subharmonic mixers is proposed in this paper. In order to meet the need of low conversion loss, antiparallel diodes are selected and the length of four open/shorted microstrip stubs at both sides of the antiparallel diodes are carefully designed. For any important idle frequency components which can’t be reused by the four stubs, reactive terminations are presented by adjusting the length of main RF and LO microstrip. The tested results indicate the lowest conversion loss is 26.1 dB at the radio frequency of 72 GHz, with fixed LO at 12 GHz. The proposed circuit architecture is suitable for the implementation of subharmonic mixers in E-band as well as other millimeter and submillimeter-wave regions where high quality and high frequency LOs are difficult to realize.