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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.
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.
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.
Design of Low-Loss and Highly-Selective Cmos Active Bandpass Filter at K-Band
Sen Wang;Bo-Zong Huang
PIER , 2012, DOI: 10.2528/PIER12031301
Abstract: In this paper, a second-order Chebyshev active bandpass filter (BPF) with three finite transmission zeros is presented. The filter utilizes a tapped-inductor feedback technique to compensate resistive losses of on-chip inductors, and a shunt-feedback inductor between input and output ports to achieve the transmission zeros. Moreover, one transmission zero is in the lower stopband, and two transmission zeros are in the upper stopband, thus improving the selectivity of the filter significantly. The filter is designed and fabricated in a standard 0.18-μm CMOS technology with a chip area of 0.57 mm×0.65 mm including all testing pads. The circuit draws 6 mA from a 0.7-V supply voltage. Additionally, the filter achieves a 1.65-dB insertion loss and 13.2-dB return loss with a 17% 3-dB bandwidth at 23.5 GHz. The measured NF and input P is 6.7 dB and -3.5 dBm. The rejection levels at the transmission zeros are greater than 15.2 dB. Finally, the large-signal characterizations are also investigated by the 1-dB compression point (P) of the filter.
Selective coupling of superconducting qubits via tunable stripline cavity  [PDF]
M. Wallquist,V. S. Shumeiko,G. Wendin
Physics , 2006, DOI: 10.1103/PhysRevB.74.224506
Abstract: We theoretically investigate selective coupling of superconducting charge qubits mediated by a superconducting stripline cavity with a tunable resonance frequency. The frequency control is provided by a flux biased dc-SQUID attached to the cavity. Selective entanglement of the qubit states is achieved by sweeping the cavity frequency through the qubit-cavity resonances. The circuit is scalable, and allows to keep the qubits at their optimal points with respect to decoherence during the whole operation. We derive an effective quantum Hamiltonian for the basic, two-qubit-cavity system, and analyze appropriate circuit parameters. We present a protocol for performing Bell inequality measurements, and discuss a composite pulse sequence generating a universal control-phase gate.
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
QUASI-TEM WAVE ANALYSIS OF GAP DISCONTINUITY IN SUSPENDED STRIPLINE
悬置微带间隙不连续性的准TEM波分析

Rong Aosheng,Li Sifan,
戎敖生
,李嗣范

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).
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.
Frequency Selective Control of a Parallel Active Filter with Resonance Filter Regulators
O. Krievs , L. Ribickis
Latvian Journal of Physics and Technical Sciences , 2009, DOI: 10.2478/v10047-009-0001-6
Abstract: The paper describes a method for frequency selective control of parallel active filters that are applied for compensation of the current harmonic distortions and the displacement power factor in symmetrical three-phase systems with a known harmonic spectrum. For simulation, an active filter for harmonic current compensation of a three-phase full-bridge diode rectifier was used. Comparative analysis has shown a good agreement between the results obtained experimentally and by simulation
A Novel Compact Suspended Double Side Cmrc Millimeter Bandpass Filter with Wide Stopband
Xiao-Fan Yang;Yong Fan;Bo Zhang;Minghua Zhao
PIER Letters , 2011, DOI: 10.2528/PIERL11011603
Abstract: This paper presents a novel compact suspended double side millimeter bandpass filter (BPF) with wide stopband using Suspended Compact Microstrip Resonant Cell (SCMRC). For SCMRC exhibit slow-wave band-stop characteristics, two distributed SCMRC structures are designed to achieve wide stopband characteristic. By apply SCMRC structure and double side design, this novel BPF is size reduced. Back-to-back rectangular waveguide to suspended microstrip probe transitions at different millimeter bands are designed and fabricated to verify transmission characteristics of novel SCMRC bandpass filter. Experimental results show low insertion loss (< 1.2 dB) in the passband and sharp, wide rejection in the stopband with about 150% bandwidth (below -15 dB, from 50 GHz to 100 GHz), make good agreement with simulated results.
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