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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.
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.
UWB-BPF with Application Based Triple Notches and Suppressed Stopband
Abu Nasar Ghazali;Srikanta Pal
PIER C , 2013,
Abstract: An ultra-wideband (UWB) bandpass filter (BPF) with application oriented triple notches and simultaneously suppressed stopband is proposed. Implementing complementary split ring resonator (CSRR) and novel complementary meandered folded split ring resonators (CMFSRR) shaped defected ground structures (DGS) in the ground of proposed structure generates the triple notch in the UWB passband. The notch positions are functions of CSRR/CMFSRR profile dimensions. Stopband is suppressed using the dual attenuation poles generated by the double equilateral-U (DEU) shaped DGS. An approximate lumped equivalent circuit model of the proposed filter is presented. Measured results obtained are in good agreement with the equivalent circuit model and full wave electromagnetic (EM) simulation. The filter is small in size with an overall area of 26.06 mm × 11 mm.
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.
Compact UWB Filter Based on Surface-Coupled Structure with Dual Notched Bands
Jian-Quan Huang;Qing-Xin Chu;Chuan-Yun Liu
PIER , 2010, DOI: 10.2528/PIER10062203
Abstract: A novel compact ultra-wideband (UWB) band-pass filter (BPF) based on surface-coupled structure is proposed. The surface-coupled structures and Y-shaped shorted stub resonator are adopted as quasi-lumped circuit elements to achieve UWB pass-band. To avoid the interference of the wireless local area network (WLAN) at 5.25 and 5.775 GHz, two different quarter-wavelength lines are arranged on the ground of UWB BPF to generate dual narrow stop bands. Being developed from the quasi-lumped elements, the proposed UWB BPFs have very compact size. The fabricated UWB BPFs have the advantages of low insertion loss, good selectivity and flat group delay. Good agreement between equivalent circuit modeled, simulated and measured responses of these filters is demonstrated.
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 UWB BPF Using Quintuple-Mode Stub-Loaded Resonator
Hong-Wei Deng;Yong-Jiu Zhao;Lu Zhang;Xue-Shun Zhang;Wei Zhao
PIER Letters , 2010, DOI: 10.2528/PIERL10040303
Abstract: In this letter, a novel compact UWB bandpass filter (BPF) with sharp rejection skirt is realized using quintuple-mode stub-loaded resonator. The resonator can generate three odd-modes and two even-modes in the desired band. By simply adjusting the lengths of open stubs in shunt and shortcircuited stubs, the first five resonant modes of the resonator can be roughly allocated within the 3.1-10.6 GHz UWB band meanwhile the sixth resonant mode in the upper-stopband can be suppressed. The pair of short stubs can generate two transmission zeros near the lower and upper cut-off frequencies, leading to a sharp rejection skirt. A quintuple-mode UWB BPF is designed and fabricated and the measured results demonstrate the feasibility of the design process.
A New Design Method for Ultrawideband Microstrip-to-Suspended Stripline Transitions  [PDF]
Young-Gon Kim,Kang Wook Kim
International Journal of Antennas and Propagation , 2013, DOI: 10.1155/2013/801950
Abstract: A clear and efficient design method for ultra-wideband microstrip-to-suspended stripline transition, which is based on the analytical expressions of the whole transitional structure, is presented. The conformal mapping is applied to obtain the characteristic impedance of the transitional structure within 2.85% accuracy as compared with the EM-simulation results. The transition is designed to provide broadband impedance matching and smooth field conversion. The implemented transition performs less than 0.6?dB insertion loss per transition for frequencies up to 30?GHz. 1. Introduction Among various planar transmission lines used for microwave and millimeter-wave circuits, suspended stripline (SSL) offers some unique advantages as compared with other transmission lines [1, 2]. (1) SSL yields a higher quality factor than printed stripline and microstrip line (MSL). Since most of the propagated signal energy is carried through the air region rather than through the dielectric layer of the substrate, line losses are considerably reduced, which results in a high Q factor on the order of 500. (2) SSL provides wide impedance ranges because the width of SSL’s strip is wider than MSL under the same characteristic impedance. (3) Since the SSL substrate is suspended at the center of a rectangular waveguide, it is easy to design a capacitance overlapped by top and bottom strips, enabling it to implement high-performance ultrawideband filters [2–6]. (4) Due to the shielded structure, radiation leakage is minimized. On the other hand, MSL is one of the most widely used transmission lines for microwave and millimeter-wave integrated circuits. Using MSL, microwave components—e.g., antennas, couplers, filters, power dividers, and so forth—can be designed with low-cost and compact characteristics [7]. Therefore, to combine the advantages of SSL and MSL simultaneously, it is important to develop a suitable and high performing transition structure between the two different transmission lines, and there were already variously related researches. In [8], an MSL-to-SSL transition using multilayer techniques was reported. The transition bandwidth was up to 12?GHz; however, it lacked the ground continuity between the SSL and the microstrip ground plane. In [9], a transition structure between the shielded MSL and SSL was developed with its available bandwidth up to 40?GHz. However, a clear design guidance including theoretical analysis was not provided. In this paper, a new design method of an ultrawideband MSL-to-SSL transition based on theoretically derived closed-form equations
Miniature Suspended-Substrate Bandpass Filter
B. A. Belyaev;Aleksandr A. Leksikov;A. M. Serzhantov;Vladimir V. Tyurnev
PIER C , 2010, DOI: 10.2528/PIERC10070604
Abstract: A new quasi-lumped suspended-substrate stripline structure admitting implementation of miniature highly selective narrowband filters is studied. Appreciable improvement of the device selectivity is achieved with supplementary strip conductors introduced between the resonators, which induce attenuation poles near both passband edges. Furthermore, these supplementary conductors reducing the coupling between the resona-tors allow diminishing the inter-resonator spacing and the total size. A four-resonator filter is synthesized using the intelligence optimization method. Experimental results of the manufactured filter are presented.

Rong Aosheng,Li Sifan,

电子与信息学报 , 1988,
Abstract: An analysis technique----quasi-TEM wave analysis for gap discontinuity insuspended stripline is proposed. On either side of the discontinuity, the gap discontinuities with the same structure are inserted at equal spacing so that periodic discontinuity arrangement is constructed. The periodic length is so chosen that the interactions beween adjacent discotinuities vanish. A periodic range of them is analyzed. Its total capacitance is calculated by the two-dimensional Fourier transformation technique, from which the equivalent parameters of the discontinuity is obtained. When the suspended stripline degenerates into the stripline, numerical results are in agreement with the given by R. S. Yahya, et al. (1974).
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