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Novel Miniaturized Bandpass Filters Using Spiral-Shaped Resonators and Window Feed Structures
Gaole Dai;Mingyao Xia
PIER , 2010, DOI: 10.2528/PIER09120401
Abstract: In this paper, we present a new class of miniaturized microstrip bandpass filters with low-insertion loss, sharp-rejection and narrow-band performance. The proposed filters are composed of two spiral-shaped resonators and rectangle window feed structures. Both back-to-back and interdigital combinations of the resonators are adopted to obtain the miniaturized filter size. Compared to the traditional square loop bandpass filter, the sizes are reduced by 82% and 80%. It is also found that there is a pair of transmission zeros located on each side of the passbands, resulting in high selectivity. To validate the proposed idea, two demonstration filters with back-to-back and interdigital spiral-shaped resonators are implemented. The measured results exhibit good agreement with the full-wave simulation results.
Design of a Miniaturized LTCC Lumped Balun

王鑫, 戴永胜
Hans Journal of Wireless Communications (HJWC) , 2016, DOI: 10.12677/HJWC.2016.62007
本文提出了一种基于LTCC技术的集总巴伦的设计与实现方法。该小型化集总巴伦由简易LC巴伦结构改进而成,利用ADS软件进行电路仿真以及HFSS软件三维建模设计。性能测试结果表明:测量结果数据与仿真结果基本一致,该巴伦的标称中心频率为70 MHz,频带宽20 MHz,通带内插入损耗小于4.7 dB,两端口相位差大于172?,尺寸仅为2.5 mm × 1.5 mm × 1 mm。完全能够满足当今通信设备日益小型化的要求。
This paper presented a design and realization method of lumped balun based on the LTCC tech-nology, which was derived from simple LC balun and designed by ADS circuit simulation and the HFSS software to optimize the 3D modeling. The measured results agree with the simulated data basically, the center frequency of balun sample is 70 MHz, the bandwidth is 20 MHz, the insertion loss of the pass band is less than 4.7 dB, the phase difference between the two output ports is more than 172?, the size is only 2.5 mm × 1.5 mm × 1 mm. The balun can totally be used in miniaturized mobile communication equipment.
Microstrip Cross-coupled Interdigital SIR Based Bandpass Filter
R. K. Maharjan,B. Shrestha,N. Y. Kim
Radioengineering , 2012,
Abstract: A simple and compact 4.9 GHz bandpass filter for C-band applications is proposed. This paper presents a novel microstrip cross-coupled interdigital half-wavelength stepped impedance resonator (SIR) based bandpass filter (BPF).The designed structure is similar to that of a combination of two parallel interdigital capacitors. The scattering parameters of the structure are measured using vector network analyzer (VNA). The self generated capacitive and inductive reactances within the interdigital resonators exhibited in a resonance frequency of 4.9 GHz. The resonant frequency and bandwidth of the capacitive cross-coupled resonator is directly optimized from the physical arrangement of the resonators. The measured insertion loss (S21) and return loss (S11) were 0.3 dB and 28 dB, respectively, at resonance frequency which were almost close to the simulation results.
A Miniaturized Bandpass Filter with Controllable Harmonic by Using Split Impedance Resonators
Jian-Yi Li;Wen-Jeng Lin;Ding-Bing Lin;Lih-Shan Chen;Mau-Phon Houng
PIER C , 2010, DOI: 10.2528/PIERC10052306
Abstract: In this paper, a miniaturized bandpass filter with controllable harmonic by using split impedance resonators is proposed. The proposed split impedance resonator is based on the theories of the basic parallel impedance formula and stepped impedance resonators (SIRs). In this way, the split impedance resonator can be effectively designed to obtain good coupling for reducing the insertion loss. Furthermore, a miniaturized bandpass filter with controllable spurious frequency is proposed. The proposed bandpass filter not only has good passband characteristics but also obtains miniaturization around 21.87% versus the traditional SIR bandpass filters.
Etching Method for the Microstructure of LTCC  [cached]
Feng Yuan
Modern Applied Science , 2010, DOI: 10.5539/mas.v4n4p70
Abstract: 1wt% hydrochloride acid (HCl), 2wt% hydrofluoric acid (HF), 10wt% hydro nitride acid (HNO3), and 19wt% sodium hydroxide (NaOH), were used to etch the LTCC. The SEM analysis shows that the microstructure of the LTCC A6 (Ferro) can be obtained through the etching of the 19wt% sodium hydroxide. The XRD analysis confirmed that the glass phase can be selectively removed from the glass ceramics in a 19 wt% sodium hydroxide aqueous solution at room temperature after 20 hrs.
New Generation of LTCC Materials  [cached]
Valant, Matjaz,Suvorov, Danilo
Boletín de la Sociedad Espa?ola de Cerámica y Vidrio , 2004,
Abstract: To reduce the complexity of LTCC systems and so accelerate the development of LTCC tapes with new functionalities it is necessary to reduce the number of phases within a particular tape. This can best be done by using glass-free single-phase ceramic systems. Such a material system consisting of low- and high-permittivity LTCC materials was developed based on Bi eulytite (permittivity; k’=16) and sillenite (k’=40) compounds and the δ-Bi2O3 solid solution with Nb2O5 (k’=90). The Ge and Si analogues of the sillenites and eulytites, and the 0.75Bi2O3 0.25Nb2O5 solid solution meet the main requirements for LTCC with respect to their sintering behavior (Ts=850-900oC), their mutual chemical compatibility, their compatibility with a silver electrode as well as their dielectric properties. Para reducer la complejidad de los sistemas LTCC y así acelerar el desarrollo de láminas de LTCC con nuevas funcionalidades es necesario reducir el número de fases dentro de una determinada lámina. La mejor manera de hacer esto es usar sistemas cerámicos monofásicos libres de fase vítrea. Dicho sistema que consiste en materiales LTCC de baja- y alta-permitividad se ha desarrollado en base a compuestos de Bieulitita (permitividad; k’=16) y silenita (k’=40) y la solución sólida de δ-Bi2O3 con Nb2O5 (k’=90). Los análogos de Ge y Si de las silenitas y eulititas, y la solución sólida 0.75Bi2O3 0.25Nb2O5 cumplen los principales requerimientos de los LTCC respecto a su comportamiento de sinterización (Ts=850-900oC), su compatibilidad química mutua y su compatibilidad con electrodos de plata, así como en lo concerniente a sus propiedades dieléctricas.
Thick-Film and LTCC Passive Components for High-Temperature Electronics
A. Dziedzic,D. Nowak
Radioengineering , 2013,
Abstract: At this very moment an increasing interest in the field of high-temperature electronics is observed. This is a result of development in the area of wide-band semiconductors’ engineering but this also generates needs for passives with appropriate characteristics. This paper presents fabrication as well as electrical and stability properties of passive components (resistors, capacitors, inductors) made in thick-film or Low-Temperature Co-fired Ceramics (LTCC) technologies fulfilling demands of high-temperature electronics. Passives with standard dimensions usually are prepared by screen-printing whereas combination of standard screen-printing with photolithography or laser shaping are recommenced for fabrication of micropassives. Attainment of proper characteristics versus temperature as well as satisfactory long-term high-temperature stability of micropassives is more difficult than for structures with typical dimensions for thick-film and LTCC technologies because of increase of interfacial processes’ importance. However it is shown that proper selection of thick-film inks together with proper deposition method permit to prepare thick-film micropassives (microresistors, air-cored microinductors and interdigital microcapacitors) suitable for the temperature range between 150°C and 400°C.

Ma Xikui,

电子与信息学报 , 1993,
Abstract: The conducting strip interdigital capacitance on a dielectric substrate is analyzed with the moment method. The theoretical formulas are given. A number of illustrative examples are numerically calculated, which shew the correctness and the effectiveness of the method presented here.
Bandpass Filter Using Miniaturized Scrlh Mzor
Ji-Kang Wang;Yong-Jiu Zhao;Wei Liu;Quan Sun;Li Qiang
PIER Letters , 2011, DOI: 10.2528/PIERL10110403
Abstract: A highly miniaturized simplified composite right/left handed (SCRLH) mushroom zeroth-order resonator (MZOR) is proposed for bandpass filter (BPF) design. By introducing the U-slot etched around the metallic via (UEAV), more flexible selection of the shunt inductance value can be achieved compared with the original one. As the length of UEAV increased, zeroth-order resonant frequency of the MZOR decreased, even 88% size reduction can be achieved. Finally, a bandpass filter based on the proposed MZOR is designed, fabricated and measured. The simulated and measured results are presented and good agreement is obtained.
A Miniaturized UWB BPF Based on Novel Scrlh Transmission Line Structure
Ji-Kang Wang;Yong-Jiu Zhao;Li Qiang;Quan Sun
PIER Letters , 2010, DOI: 10.2528/PIERL10091802
Abstract: A miniaturized ultra-wideband (UWB) bandpass filter (BPF) with U-slot etched around the metallic via in the ground is proposed based on a simplified composite right/left-handed transmission line (SCRLH TL) structure. The U-slot etched in the ground makes it feasible to reduce the overall size. A demonstration of FCC standard UWB bandpass filter (BPF) is designed, fabricated and measured. Very good agreement is shown between measurement and simulation.
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