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Design of High Order Suspended Stripline Bandpass Filter with Miniaturization
Mingchih Chen;Chang-You Jiang;Wei-Qin Xu;Min-Hua Ho
PIER Letters , 2009, DOI: 10.2528/PIERL09031601
Abstract: A quasi-lumped design of a suspended stripline (SSL) bandpass filter (BPF) exhibiting high signal selectivity is proposed. In the circuit, transmission zeros were implanted to enhance the stopband signal rejection. A sample BPF having an operation band of 6.77--7.33\,GHz was fabricated and measured for performance verification of the proposed design.
Suspended Substrate Stripline Bandpass Filters with Source-Load Coupling Structure Using Lumped and Full-Wave Mixed Approach
Min-Hua Ho;Po-Fan Chen
PIER , 2012, DOI: 10.2528/PIER11102502
Abstract: This paper presents the design of two suspended substrate stripline (SSS) bandpass filters (BPFs), both with a source-load coupling structure embedded to create a transmission zero (TZ) near each side of the passband edges. For the first BPF, the physical circuit layout is proposed first and followed by the establishment of an equivalent LC circuit. The optimization of element values of the LC circuit using a circuit-level simulator leads to quick adjustment of the structural parameters of the physical circuit layout with the aid of a full-wave simulator. For the second BPF, the ingenious equivalent LC circuit modified from that of the first one is proposed for bandwidth enhancement, which is achieved by exciting two extra loaded resonances in the passband. With the element values of the LC circuit optimized, proper reshaping the physical circuit layout from that of the first BPF is easily accomplished. The presented lumped and full-wave mixed approach is very efficient in that the circuit-level simulator is used to the largest extent and the time-consuming full-wave simulator is employed only at the later stage of the design. Experiments are conducted to verify the design of the two SSS BPFs and agreements are observed between the measured and simulated data.
Miniaturization Design of Full Differential Bandpass Filter with Coupled Resonators Using Embedded Passive Device Technology
Sung-Mao Wu;Chun-Ting Kuo;Pei-Yu Lyu;Yu Li Shen;Ching-I Chien
PIER , 2011, DOI: 10.2528/PIER11091404
Abstract: This paper presents two full differential bandpass filters with small occupied areas. Both filters are designed with the same basic structure which consists of two double coupled resonators with magnetic coupling. The resonators are stacked up and have the advantage of high coupling efficiency, reducing the area. Nevertheless, in the basic structure, the insertion loss in the high stopband is above -10 dB and therefore does not meet the requirement for bandpass filter design. Thus, two solutions are introduced to form the proposed filters. The first one integrates the ground plane, while the second one makes the use of an extra transmission zero. With the help of these solutions, two types of full differential bandpass filters are implemented on an FR4 using the embedded passive device technology, with the additional purpose of being designed for SiP applications. The passband of the filters conforms to the WLAN IEEE 802.11a (5 GHz) standard. Most importantly, the occupied areas of the two proposed bandpass filters are only 6 mm х 6.7 mm and 6.6 mm х 8.3 mm respectively. Compared with previous research, area reductions of up to 98.05% and 97.76% can be achieved.
Quasi-Lumped Design of UWB BPF Using Suspended Stripline
Xian-Jie Liao;Min-Hua Ho;Wei-Hong Hsu;Wei-Qin Xu;Li-Jing Lin
PIER Letters , 2009, DOI: 10.2528/PIERL09080601
Abstract: We propose a novel UWB bandpass filter (BPF) design using the suspended stripline (SSL). The filter composes of a lowpass and a high-pass circuit, both implemented by SSL structures. A notch response structure might be implemented to the filter by embedding a resonant slotline. The quasi-lumped elements circuit models were developed to analyze these circuits' performance. Experiments were conducted, and good agreements were observed between the measurements and simulations.
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.
Highly Selective Suspended Stripline Dual-Mode Filter
B. A. Belyaev;Aleksandr A. Leksikov;A. M. Serzhantov;Vladimir V. Tyurnev
PIER Letters , 2011, DOI: 10.2528/PIERL11053001
Abstract: Miniature bandpass filter constructions based on a novel dual-mode suspended stripline resonator are proposed. Because of a special structure of the resonator, the frequencies of two first oscillation modes may be brought closer together. That allows realizing narrowband filters with the wide upper stopband. The filters have low insertion loss in the passband at small dimensions. Several transmission zeros substantially improve the filter performance. The derived coupling coefficients account for some features in the frequency response of the filter. The second-order and fourth-order filters with transmission zeros have been fabricated and measured.
Novel Compact Dual-Band Bandpass Microstrip Filter
Subash Vegesna;Mohammad A. Saed
PIER B , 2010, DOI: 10.2528/PIERB10012210
Abstract: In this paper, a novel microstrip structure is developed to realize a dual-band bandpass filter. The proposed bandpass structure uses a microstrip resonator with two independently controlled resonance frequencies producing two frequency bands of interest controlled by adjusting the dimensions of the resonator. Parametric analysis is performed on the structure to determine the optimum dimensions to obtain the desired frequency response and is explained in the paper. The dual-band bandpass filter developed in this paper exhibits dual operating frequencies at 1390 MHz and 2520 MHz with 9.85% and 9.92% fractional bandwidths respectively. We achieved a compact second-order dual-band bandpass filter with controllable resonance frequencies and low insertion losses in the passband with high selectivity. The measured results are in good agreement with simulated results. Additionally, it can be easily fabricated and can be used in applications where miniaturization and compatibility with microstrip technology are of primary concern.
Mutual External Inductance in Stripline Structures
Marina Y. Koledintseva;James L. Drewniak;Thomas P. Van Doren;David J. Pommerenke;Matteo Cocchini;David M. Hockanson
PIER , 2008, DOI: 10.2528/PIER07111503
Abstract: The Method of Edge Currents (MEC) proposed in our previous paper [1] is applied herein for calculating the mutual external inductance associated with fringing magnetic fields that wrap ground planes of a stripline structure. This method employs a quasi-static approach, image theory, and direct magnetic field integration. The resultant mutual external inductance is frequency-independent. The approach has been applied to estimating mutual inductance for both symmetrical and asymmetrical stripline structures. Offset of the signal trace from the centered position both in horizontal and vertical directions is taken into account in asymmetrical structures. The results are compared with numerical simulations using the CST Microwave Studio Software.
Niobium stripline resonators for microwave studies on superconductors  [PDF]
Markus Thiemann,Daniel Bothner,Dieter Koelle,Reinhold Kleiner,Martin Dressel,Marc Scheffler
Physics , 2014, DOI: 10.1088/1742-6596/568/2/022043
Abstract: Microwave spectroscopy is a powerful experimental tool to reveal information on the intrinsic properties of superconductors. Superconducting stripline resonators, where the material under study constitutes one of the ground planes, offer a high sensitivity to investigate superconducting bulk samples. In order to improve this measurement technique, we have studied stripline resonators made of niobium, and we compare the results to lead stripline resonators. With this technique we are able to determine the temperature dependence of the complex conductivity of niobium and the energy gap $\Delta(0)=2.1$ meV. Finally we show measurements at the superconducting transition of a tantalum bulk sample using niobium stripline resonators.
The Design of a Miniaturized Interdigital LTCC Bandpass Filter

乔冬春, 戴永胜
Hans Journal of Wireless Communications (HJWC) , 2016, DOI: 10.12677/HJWC.2016.62005
本文提出了一种基于LTCC技术的小型化交指型带通滤波器的设计方法,通过在交指线末端加载对地电容,压缩了谐振器尺寸,将对地电容布置在分立的空间中,避免了电容间的耦合干扰,引入非相邻谐振器间交叉耦合,在通带两端各产生一个零点,提高了边带抑制。设计了一款中心频率2.3 GHz,带宽200 M交指型带通滤波器,插损小于2.5 dB,通带波动优于0.5 dB,利用三维仿真软件HFSS建模及优化,并利用LTCC工艺加工制造,尺寸仅为3 mm × 2 mm × 1.5 mm,经测试,实际测试曲线与仿真曲线符合较好,验证了设计的有效性。
A method of designing miniaturized interdigital bandpass filter based on LTCC technology was proposed, through loading ground capacitance at the end of interdigital transmission line, com-pressed the volume of resonator, to arrange the ground capacitance in discrete space, avoided the coupling interference between themselves, then cross-coupling was introduced between nonad-jacent resonator, generated two transmission zeros on both sides of the passband and improved the sideband suppression. A interdigital bandpass filter with center frequency 2.3 GHz and bandwidth 200 M was designed, the insertion loss was less than 2.5 dB, passband fluctuation was better than 0.5 dB, HFSS was used to construct the 3D model and optimize the simulated results, then fa-bricated the filter with LTCC technology, the size was only 3 mm × 2 mm × 1.5 mm, the measured curves confirmed well with the simulated curves, verified the validity of the design.
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