基于LTCC技术的S波段双工器的设计

借助低温陶瓷共烧(LTCC)技术和三维叠层结构的设计方法,设计了有限传输零点的带通滤波器(BPF),然后通过匹配网络设计了一种S波段双工器,利用HFSS仿真软件对其对其参数进行了仿真优化。该双工器尺寸为18.4mm×15.8mm×0.6mm,在2.06GHz和2.21GHz处的插损小于-3.72dB,在1.87GHz和2.32GHz处衰减大于-55dB,在1.51GHz到2.52GHz处隔离度小于-12dB,达到了双工器设计指标要求和小型化的目的。     

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。     

基于LTCC 的Ka 波段三阶交叉耦合SIW 滤波器*

介绍了一种基于低温共烧陶瓷(LTCC)工艺研制而成的Ka 波段带通滤波器。该滤波器由三个交叉耦合的集成介质波导(SIW)谐振器构成。滤波器在j4.0 处的衰减极点使得其频率选择特性具有非对称性。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很好。其中心频率是35.8GHz,1dB 带宽是1GHz,带内插损小于4.2dB。该小型化LTCC 滤波器已成功应用于某毫米波战场识别系统的T/ R 组件中。     

双波段高抑制的LTCC微型双工器设计

该文设计了基于低温共烧陶瓷(LTCC)技术的双波段高抑制、低损耗的双工器。该双工器由低通滤波器和带通滤波器组成,且在低、高频段的阻带抑制方面运用了传输零点理论,在实现双工器低损耗的同时,也实现了在多波段的高抑制,提升了双工器的性能。该双工器在低频段(0.68~0.95 GHz)及高频段(1.43~2.40 GHz)时插损均小于1.2 dB,但在1.43~2.40 GHz时双工器抑制大于20 dB,0.68~0.95 GHz时双工器抑制大于15 dB。在4.9~5.9 GHz时双工器抑制大于13 dB,具有良好的市场应用前景。     

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。     

L 波段带双零点的窄带LTCC 滤波器设计

本文应用LTCC 技术设计了一个L 波段二阶Chebyshev 窄带带通滤波器。该滤波器集成在9 层LTCC 介质中,采用等效集总元件（电容电感)结构,充分利用LTCC 的三维封装结构减小滤波器体积,通过谐振单元中集总元件的串并联产生两个带外传输零点,同时调整谐振单元耦合间距控制带宽。滤波器输入输出利用金属通孔将带状线过渡到微带上。滤波器（带过渡结构）的仿真结果为：中心频率1.42 GHz,1 dB 相对带宽2.1%,插入损耗通带内最低0.5 dB, 回波损耗优于20 dB,整个滤波器体积为：4.5×4×0.87 mm3。     

超小型的片式LTCC滤波器设计

针对微波设备小型化需求,利用低温共烧陶瓷(LTCC)技术,建立了小型化的LTCC电感和LTCC电容模型,并设计了内埋置LTCC电感和电容的片式L频段集总型带通滤波器,同时为了满足高频应用,设计了X频段分布带状线LTCC带通滤波器,通过用电磁场仿真软件ANSYS HFSS对滤波器进行建模及三维仿真优化,加工实现,制成的L和X频段LTCC带通滤波器的插入损耗分别<2.5 d B和<3 d B,体积分别为6 mm×3 mm×1.1 mm和3.1 mm×2 mm×1.1 mm,小型化效果明显。     

一种Ku频段波导双工器的小型化设计

本文提出了一种工作于Ku频段的紧凑型全带宽高隔离度波导双工器,该双工器由正交模耦合器OMT(Ortho-Mode Transducer)和消失模波导滤波器组成,OMT采用非对称无隔膜形式,结构紧凑的同时实现了正交模极化隔离度大于50dB。滤波器采用了结构紧凑的消失模滤波器,带外抑制好,用于上行链路信号的分离,下行链路信号的分离则用一段截止波导来实现。该双工器接收频段为10.7～12.75GHz,发射频段为13.75～14.5 GHz,最终实现工作频段内反射系数均小于-15dB,驻波小于1.5,收发端口间隔离度大于95dB,且整体结构高度小于50mm,长度小于103mm,实现了双工器小型化且高隔离度的要求。     

微波窄带带通滤波器的设计

分析了微带线窄带滤波器设计的基本理论,借助AgilentADS仿真软件完成了中心频率位于L波段的窄带带通滤波器的设计。该滤波器选用切比雪夫的原型结构,并由耦合微带线构成,其通带为1．9GHz～2．1GHz,通带内衰减小于1．5dB,起伏小于0．5dB,在1．7GHz和2．3GHz衰减大于20dB,端口反射系数小于-15dB。版图仿真结果满足滤波器设计要求。     

基于LTCC工艺的低通滤波器设计与实现

为了实现具有高Q值电容电感的小型化滤波器,本文采用低温共烧陶瓷(LTCC)工艺分别构建了垂直螺旋式电感和垂直直插式电容,利用电容电感的参数提取公式并结合HFSS软件进行优化仿真,获得具有高Q值的电容电感模型,并根据此模型来设计一款DC-500MHz小型化低通滤波器。最终经过实际测试结果表明该低通滤波器性能为：在0~500MHz插入损耗优于-0.5dB,回波损耗优于-18dB,带外抑制在1GHz处有-30dB,在1.5GHz处有-50dB。 关键词：低通滤波器;低温共烧陶瓷工艺;高Q值;小型化     

Synthesis and design of an LPF with wide-stop band and high rejection level

In this paper, a compact microstrip lowpass filter (LPF) is designed, analyzed, simulated, and tested. The proposed design that consists of a basic part in the central section of the structure and two parts of suppression of harmonics that are inserted in the first and last sections of the basic part, have wide-stop band, high suppression factor (−38 dB attenuation level from 2.4 GHz up to 27.4 GHz), low normalized size and sharp roll-off. The proposed LPF has a −3 dB cut-off frequency of 2.4 GHz, a wide stopband bandwidth around 11th harmonic suppression and an insertion loss less than 0.1 dB at passband. This filter has been fabricated and tested and good agreement is observed between the simulated and measured results.     

Design of low-pass filter with 3-interations Koch fractal Pi-shaped DGS

A novel asymmetrical Pi-shaped defected ground structure (DGS) with 3-interations Koch fractal curves is proposed to design a microstrip low-pass filter (LPF) with ultra-wide stop-band (SB). The proposed LPFs with a single resonator and two cascaded resonators are both designed, simulated, manufactured and measured. Simulation and experiment results demonstrate that the designed LPF has a very sharp transition band (TB) and an ultra-wide SB performance compared with the existed similar symmetrical and asymmetrical DGS. The proposed LPF with two cascaded resonators is with a compact size of 36.8 mm×24.0 mm, a very low insertion loss of less than 0.7 dB under 1.9 GHz, and a wide SB from 2.2 GHz to 8 GHz with rejection of larger than 30 dB.     

Compact microstrip lowpass filter with wide stopband and sharp roll-off using tapered resonator

In this article, a novel microstrip lowpass filter (LPF) with specifications such as sharp cut-off, wide stopband, low insertion loss and high return loss using tapered resonator is presented. The LPF has cut-off frequency of 1.11 GHz, where unwanted harmonics are suppressed by novel tapered cells. The bandwidth is enhanced, and the size is reduced as compared to the conventional tapered filter. The transition band is approximately 0.29 GHz from 1.11 to 1.4 GHz with corresponding attenuation levels of –3 and –20 dB, respectively. The stopband with greater than –20 dB rejection is from 1.4 to 8.9 GHz, insertion loss in the passband is less than 0.1 dB, return loss is less than –18 dB and the overall size of the filter is 0.12 × 0.073 λ_g. The proposed filter is fabricated and measured. The simulation and measurement results are in good agreement. This LPF is designed for microwave communication applications, especially wireless video transmitters.     

Compact multilayer dual-band bandpass filter design using stepped impedance resonators

Compact dual-band bandpass filter (BPF) for the 5th generation mobile communication technology (5G) radio frequency (RF) front-end applications was presented based on multilayer stepped impedance resonators (SIRs). The multilayer dual-band SIR BPF can achieve high selectivity and four transmission zeros (TZs) near the passband edges by the quarter-wavelength tri-section SIRs. The multilayer dual-band SIR BPF is fabricated on a 3-layer FR-4 substrate with a compact dimension of 5.5 mm ×5.0 mm ×1.2 mm. The measured two passbands of themultilayer dual-band SIR BPF are 3.3 GHz -3.5 GHz and 4.8 GHz -5.0 GHz with insertion loss (IL) less than 2 dB respectively. Both measured and simulated results suggest that it is a possible candidate for the application of 5G RF front-end at sub-6 GHz frequency band.     

Ultra Wideband Bandpass Filter Using Embedded Stepped Impedance Resonators on Multilayer Liquid Crystal Polymer Substrate

This letter proposes an ultra wideband (UWB) bandpass filter (BPF) based on embedded stepped impedance resonators (SIRs). In this study, broad side coupled patches and high impedance microstrip lines are adopted as quasi-lumped elements for realizing the coupling between adjacent SIRs, which are used to suppress stopband harmonic response. An eight-pole UWB BPF is developed from lump-element bandpass prototype and verified by full-wave simulation. The proposed filter is fabricated using multilayer liquid crystal polymer (LCP) process and measured using vector network analyzer. Good agreement between simulated and measured response is observed. The measurement results show that the fabricated filter has a low insertion loss of 0.18 dB at center frequency 6.05 GHz, an ultra wide fractional bandwidth of 127.3% and excellent stopband rejection level higher than 32.01 dB from 10.9 to 18.0 GHz.      

Small Ultra-Wideband (UWB) Bandpass Filter With Notched Band

A compact ultra-wideband (UWB) bandpass filter (BPF) with notched band has been proposed and implemented in this letter. H-shaped slot is studied and adopted to tighten the coupling of inter-digital capacitor in order to improve the BPF's performance. Three pairs of tapered defected ground structures (DGS) are formed to assign their transmission zeros towards the out of band signal, thereby suppressing the spurious passband. Combining these two structures we obtain a small sized UWB BPF. Meander line slot is developed to reject the undesired wireless local-area network (WLAN) radio signals. An experimental UWB filter with notched band was fabricated with 35% less length as compared to an embedded open-circuited stub. The measured BPF insertion loss is less than 1.0 dB throughout the pass band of 2.8 to 10.8 GHz, the variation of group delay less than 0.20 ns in this band except for the notched band, and a wide stopband bandwidth with 20 dB attenuation up to at least 20.0 GHz.     

70 GHz Folded Loop Dual-Mode Bandpass Filter Fabricated Using 0.18 $mu$ m Standard CMOS Technology

This letter presents the design and implementation of a 70 GHz millimeter-wave compact folded loop dual-mode on-chip bandpass filter (BPF) using a 0.18 $mu$m standard CMOS process. A compact BPF, consisting of such a planar ring resonator structure having dual transmission zeros was fabricated and designed. The size of the designed filter is 650$,times,$ 670 $mu$ m$^{2}$ . Calculated circuit model, EM simulated and measured results of the proposed filter operating at 70 GHz are shown in a good agreement and have good performance. The filter has a 3-dB bandwidth of about 18 GHz at the center frequency of 70 GHz. The measured insertion loss of the passband is about 3.6 dB and the return loss is better than 10 dB within the passband.      

多口三环CSRR微带低通滤波器的研究与设计

提出一种新型的多口三环CSRR结构,利用CSRR谐振器的单极点低通特性和环与微带线之间的耦合,构成低通滤波器.分析该结构的等效电路模式,指出谐振频率的计算公式.使用HFSS适当优化参数,可以得到性能良好的低通滤波器.其-3 dB截止频率8.76 GHz,通带内插入损耗小于0.3306 dB,通带内回波损耗小于-13.810 2 dB,衰减15 dB以上阻带带宽达到10.31 GHz.为了改善通带内的回波损耗,在微带线两侧加载并联开路枝节.其-3 dB截止频率8.385 GHz,通带内插入损耗小于0.174 7 dB,通带内回波损耗小于-19.707 7 dB,衰减15 dB以上阻带带宽达到10.7 GHz.