基于裂缝电桥Ka波段功率分配/合成网络

介绍了一种Ka波段的四路功率分配/合成网络。该网络采用H面波导裂缝电桥结构,只需要一个耦合单元,结构简单、易于加工。这种合成网络将使用在基于MMIC单片TGA1141的四路功率合成器中,预计在2 GHz带宽内合成输出功率可以达到连续波5 W以上。通过三维电磁仿真软件Ansoft Hfss对该网络进行了设计和优化。仿真结果表明,该网络在33-37 GHz的频段内,插入损耗小于0.3 dB,回波损耗大于20 dB。     

基于自成像效应波导耦合的光子晶体分束器

文章采用时域有限差分法和平面波法作为研究工具,在耦合长度L=7α的条件下研究了光在输出端口的透射率和反射率.结果表明,通过引入额外的介质柱改变耦合区电磁场的相位分布,可使3个输出端口的强度达到均分;并且这种结构的分束器具有很高的输出效率,最高可达到99.5%,这些特性使这种器件在波分复用等方面具有很大的潜在运用价值.     

基于薄膜电阻的波导E-T结功率分配/合成器

单个器件输出功率不满足系统要求时,功率合成技术是提高系统输出功率的有效方法.本文详细研究了基于薄膜电阻的波导E-T结功率分配/合成器,最终设计了一种新型的基于薄膜电阻的波导E-T结.该结构具有高隔离度、低插入损耗、小体积、宽频带等优点.通过合理设计薄膜电阻的长宽比,尽量增大薄膜电阻的面积,并且采用高导热的氮化铝陶瓷基板作为微带和薄膜电阻的介质基板,提高了基于薄膜电阻的波导E-T结承受的功率.利用三维电磁场仿真软件HFSS对其进行了建模仿真,加工的实物经过测试在25~34 GHz插入损耗小于0.2 d B,回波损耗优于-15 d B,隔离度优于10 d B.经对比,实测结果与仿真结果吻合,具有较好的工程应用价值.     

Electrodynamic modelling of waveguide properties of the transmission lines based on flat waveguide splitters

The capability of the H-plane waveguide joints to maintain natural [1] and quasi-natural modes [2] of Hpso type brings about an idea of possibility to develop transmission lines with E-modes based on them. From the physical point of view, the said property of the splitter allows to conclude that, to some extent, this structure is a resonator whose cut-off orthogonal waveguides serve as reflecting surfaces cutting off the electromagnetic field at a certain distance from the splitter area. Whereas the transmission line losses of lowest E-modes are higher than those of H- modes, still one could expect that, due to the semi-open character in both transverse directions, at least the cross-shaped line [3,4], with regard for its loss criterion, will be competitive with the groove waveguide [5,6].     

Broadband integrated active divider and combiner based on distributed amplification

Traditional active circuits only allow amplification in one direction and hence cannot perform the same function as passive circuits like the Wilkinson power divider (combiner). By integrating the bidirectional element into a distributed amplifier, a novel integrated active divider and combiner is proposed for wideband and active splitting (combining).     

High-performance integrated erbium/sup +3/-ytterbium/sup +3/ codoped glass waveguide laser

We report the design and characterization of an efficient erbium/sup +3/-ytterbium/sup +3/ codoped ion exchanged glass distributed Bragg reflector (DBR) laser pumped by a 980-nm pigtailed laser source. Laser oscillation at 1536 nm is demonstrated with a pump threshold of 35 mW and a slope efficiency of 10.6%. The dependence of lasing performance on pump wavelength detuning is examined for different cavity designs.     

A circuit, waveguide, and spatial power combiner formillimeter-wave amplification

A new concept for a millimeter-wave amplifier that uses circuit, waveguide, and spatial power combining is demonstrated. The passive array has a free-space-to-microstrip insertion loss below -1.5 dB from 30 to 44 GHz. Small-signal measurements of the active array reveal an average gain of 5 dB from 41 to 46 GHz and a maximum gain of 6.4 dB at 45.6 GHz. Large-signal measurements reveal a linear power gain of 2 dB and an output power of 23.7 dBm at the 1-dB compression point at 44 GHz     

芯片级全固化集成光波导陀螺

高灵敏、全固态、集成制造的微光-机-电陀螺是未来发展的新一代惯性器件,在深空探测、载人航天以及飞行器制导技术领域具有迫切应用需求.提出基于光波导微腔透射谱输出特性的惯性测量方法与系统基础结构,并对其惯性测量原理、微加工工艺以及耦合性能进行了讨论.利用数值拟合得到波导耦合系统设计优化参数,采用激光熔融热处理技术,降低了波...     

一种基于介质集成波导腔的小型化滤波器

为了实现介质集成波导滤波器的进一步小型化,通常要改进其谐振腔;通过在传统的介质集成波导谐振腔中心位置插入一个短路销钉,并且将其上金属平面与腔体四周的金属壁绝缘可以实现其体积的小型化.采用这种小型化谐振腔,设计了四腔微带滤波器,工作在2.8 GHz,相对带宽14.3％.最终加工了这个原型滤波器,仿真和测试结果吻合良好.相比采用传统的介质集成波导谐振腔的滤波器,这个滤波器尺寸可以减小到其1/4以下.     

基于基片集成波导技术的超宽带八木天线

为便于系统集成和简化馈电电路,利用基片集成波导技术设计新型八木天线.通过引向器异面分置来提高增益,提出了X波段基片集成波导八木天线,并分析了引向器个数对天线增益和工作带宽的影响.利用增加激励器个数和改变馈电结构来扩展带宽,设计了单模和半模基片集成波导双激励超宽带八木天线,仿真和测试结果表明,基片集成波导双激励八木天线的工作带宽超过40％,带内增益均高于7.0 dBi,中心频率处为9.0dBi,可以广泛应用于雷达和通信系统中.     

Dynamic gain equalisation filter based on integrated optical transversal filter with asymmetric combiner

A compact dynamic gain equalisation filter on a silica-based planar lightwave circuit has been fabricated. The filter is based on the authors' newly developed optical transversal filter that uses an asymmetric combiner. This device flattened the amplified spontaneous emission spectrum of an erbium-doped fibre amplifier to a ripple of /spl sim/1 dB over a wavelength range of 30 nm.     

Special erbium fiber amplifiers for short pulse switching, lasers,and propagation

We show that specially tailored erbium-doped fiber amplifiers (EDFA's) can be useful for short-pulse soliton lasers, switching, and propagation. EDFA properties include group-velocity dispersion, birefringence, doping level, and doping distribution; and changing each of these properties enables novel applications. Polarization-maintaining EDFA's can Re used in erbium-doped fiber lasers to avoid intensity-dependent or temperature-dependent state of polarization. We have demonstrated a passively mode-locked erbium-doped fiber laser that generates nearly transform-limited 320 fs pulses with 40 pJ energy using a polarization-maintaining EDFA near the zero dispersion wavelength and a bulk InGaAsP saturable absorber. Moderately birefringent EDFA's can be used to control the walkoff and interaction between orthogonally polarized solitons in all-optical switches. For example, through numerical simulations, we design an all-optical cascadable logic gate with a fanout of 2.7 and energy contrast of 5.5 based on interactions in a soliton period long EDFA. Furthermore, distributed EDFA's can be used for long-distance soliton propagation to shepherd the pulse using bandwidth-limited gain. For picosecond soliton pulses, we show that soliton self-frequency shift and Gordon-Hans effects limit propagation to below 100 km even for low-dispersion fibers. Bandwidth-limited amplification in EDFA may counteract frequency shift due to the soliton self-frequency shift, while frequency filters may suppress the Gordon-Hans effect. Also, because the gain spectral profile for the three-level EDFA changes with pump intensity, complications arise from pump attenuation, and the corresponding changes in the gain spectral profile along the length of the fiber     

Highly selective bandpass filter based on substrate integrated waveguide

A novel highly selective six-pole elliptic filter based on a substrate integrated waveguide (SIW) is proposed for the first time. The filter is composed of two planar SIW extend doublets. The modular design approach based on cascading small building blocks is adopted to reduce the effect of manufacturing tolerance on the performance of the filter. The proposed filter can produce four finite transmission zeros, and has an excellent stopband rejection characteristic. Measured results are presented and compared with results simulated by a high frequency structure simulator. Good agreement between simulated and measured results is observed.     

基于SOI的光波导和V形槽集成器件

文章介绍了一种基于SOI的集成半导体器件。设计了5μm×5μm的单模光波导,并用APSS软件进行了光场模式分析;利用KOH各向异性腐蚀制造了直的脊波导、Y分支器和V形槽;最后,利用紫外光敏胶将波导和光纤固定。     

基片集成波导双极化环形缝隙天线研究

基于基片集成波导(SIW)结构,提出了一种具有高端口隔离度的双极化缝隙天线。天线正面蚀刻一个直径约为λ0/2的环型缝隙作为辐射源,工作于圆形SIW谐振腔的主模TM11;背面中心位置蚀刻微带交指电容,使SIW腔体电尺寸减小了约7%;采用一对正交微带线分别由两个端口为天线馈电。所设计的天线谐振在5.8 GHz频段,–10 d B阻抗带宽为1.7%,最大增益为8.5 d Bi,端口隔离度高于35 d B。测试结果表明,该双极化天线具有高隔离度、高增益的特点,可用于MIMO等无线通信系统中。     

A new six-port junction based on substrate integrated waveguide technology

A six-port junction based on the substrate integrated waveguide (SIW) technology is proposed and presented. In this design of such a junction, the SIW is first converted to an equivalent rectangular waveguide, then regular rectangular waveguide design techniques are used. In this structure, an SIW power divider and SIW hybrid 3-dB coupler are designed as fundamental building blocks. A six-port junction circuit operating at 24 GHz is fabricated and measured. Good agreement between simulated and measured results is found for the proposed six-port junction.     

基于慢波基片集成波导的X波段功分器设计

针对传统基片集成波导（substrate integrated waveguide,SIW）功分器设计中宽带化和小型化不易兼顾的问题,提出了一种基于慢波SIW（slow-wave SIW, SW-SIW）的功分器. 采用微带折线构成的慢波结构单元加载于SIW金属表面上,代替传统SIW连续的金属表面,与同尺寸的SIW相比,SW-SIW的截止频率下降了40%,能够实现横向尺寸的缩减,尤其当SW-SIW达到与SIW相同的相移量时,SW-SIW所需纵向尺寸更小. 所提出的基于SW-SIW的功分器在具有较宽带宽的同时实现了器件尺寸的减小. 通过测试结果可得,该功分器在8.25～12.8 GHz频带内的反射系数|S₁₁|相似文献   

High-performance filtering power divider based on air-filled substrate integrated waveguide technology

A filtering power divider based on air-filled substrate-integrated waveguide (AFSIW) technology is proposed in this study. The AFSIW structure is used in the proposed filtering power divider for substantially reducing the transmission losses. This structure occupies a large area because of the use of air as a dielectric instead of typical dielectric materials. A filtering power divider provides power division and frequency selectivity simultaneously in a single device. The proposed filtering power divider comprises three AFSIW cavities. The filtering function is achieved using symmetrical inductive posts. The input and output ports of the proposed circuit are realized by directly connecting coaxial lines to the AFSIW cavities. This transition from the coaxial line to the AFSIW cavity eliminates the additional transitions, such as AFSIW-SIW and SIW-conductor-backed coplanar waveguide, applied in existing AFSIW circuits. The proposed power divider with a second-order bandpass filtering response is fabricated and measured at 5.5 GHz. The measurement results show that this circuit has a minimum insertion loss of 1 dB, 3-dB fractional bandwidth of 11.2%, and return loss exceeding 11 dB.     

基于1/4模基片集成波导的单馈电小型圆极化天线

1/4模基片集成波导可等效为由两个磁壁和一个电壁组成的等腰直角三角形波导.采用基于等腰直角三角形波导的空腔模式法分析了1/4模基片集成波导,得到了横电波模和横磁波模的表达式.基于1/4模基片集成波导设计了一种单微带馈电的平面小型圆极化天线.仿真结果表明:该天线可以实现右旋圆极化,且具有6.18 dBic的高增益和3.44％的3 dB轴比带宽.