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International audience; This paper deals with the design of Substrate Integrated Waveguide (SIW) bandpass filter for D-band (140 GHz) and terahertz (280 GHz and 420 GHz) applications. The filters are implemented in High Resistivity (HR) Silicon interposer technology provided by IHP foundry using Through Silicon Vias (TSV). Filters with 3 dB relative bandwidth of 5% and 10% are designed. A comparison of the filters performance is made for the different frequency range. It evidences the interest of SIW technology in sub-millimeter wave domain towards the resonator quality factor increase and, therefore, insertion loss reduction for filters.

International audience; Integrated planar filters at 140 GHz are hereby presented. 2 nd -order dual-mode ring-based filters are studied with and without MIM capacitive loads which allow a footprint reduction by 2.7. Both filters exhibit similar electric response with a 3-dB relative fractional bandwidth (FBW3dB) of 12 % and 4 dB of insertion loss. Two 4 th -order filters are formed by cascading two identic cells (with or without the MIM). They present a narrow FBW3dB of 9.5 % with insertion loss of approximately 10 dB. In this case, the capacitive loading leads to a 1.9 area reduction factor.

International audience; This paper presents the design of a fully integrated tunable filter implemented in SiGe-BiCMOS technology. The narrow bandpass filter (12%) is aimed at addressing two operating frequencies at 56 GHz and 74 GHz. A synthesis is proposed to control the nominal filter as well as tunability which is obtained by the use of embedded MEMs. A good agreement between electromagnetic simulation and measurement is obtained which proves the quality of both the proposed concept and the technological process.

International audience; In this article, three main aspects of passive millimeter-wave integrated filter realization are exposed. Firstly, the importance of the transmission line choice is discussed by comparing microstrip and coplanar waveguide (CPW) in BiCMOS 0.25μm technology. 50-Ω transmission lines exhibit similar losses around 0.6 dB/mm at 60 GHz. Secondly, two filter topologies, a dual-behavior resonator based filter and a dualmode ring based filter, are compared in terms of insertion losses, surface area and out-of-band rejection. They are both designed using microstrip lines and exhibit a similar 3dB fractional bandwidth (FBW 3dB ) around 12% with a 60 GHz center frequency. Finally, a miniaturization method is presented using Metal-Insulator-Metal (MIM) capacitive loading. A loaded filter is then realized and characterized. Similar electrical performance are demonstrated with a size reduction factor of 2.3.

A bandpass filter in substrate integrated waveguide (SIW) technology is designed with its suitable excitation. Sensitivity analysis of the SIW filter electrical response toward the number and positions of metallic via holes are performed using wave concept iterative procedure. It leads to a reduction of the number of vias with identical performance of the filter. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2939–2942, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26381

This article deals with the design of dual-mode ring resonator fed by quarter wavelength coupled-lines and its applications for bandpass filters. A specific synthesis was developed for ring-based resonator which made ease the design of further bandpass filters. Three compact bandpass filters were designed at 2 GHz. Comparison between experiments and simulated results proved both synthesis accuracy and QSCR-based filters efficiency toward electrical performances and size reduction. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 307–312, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23067

This paper deals with a dual-mode ring resonator fed by quarter-wavelength side-coupled lines. The resonator synthesis was developed so as to fix the central frequency, bandwidth, and transmission zeros frequencies, as well as the insertion loss in the passband. Based on this resonator, several bandpass filters were designed, which include the cascaded rings and the combination of such ring resonator with coupled line sections. Simulations are proposed throughout the paper to illustrate the various possibilities offered by the concept. The filters' experimental results in microstrip technology are also presented to validate the idea.

This invited paper discusses the implementation of tunable bandpass filters for millimeter frequency range. Several aspects will be addressed: the development of original filter topologies for which we develop synthesis for both the filter itself and tunable filter incorporating the tuning element in the synthesis. We will discuss the technology implementation to improve performances nominal filter but also to ensure the tunability using either classical techniques such as MEMs or technologies in technological breakthrough such as plasma or microfluidic techniques.

This paper discusses a method used to design planar bandpass filters for millimeter-wave applications in U- and W-band frequency ranges. For technical reasons, these filters have to be implemented on silicon-based technology. So as to decrease the insertion losses levels inherent in silicon substrate, we propose a thin-film microstrip-like technology implemented on a benzocyclobutene layer. In addition, a dual-behavior resonator-based filter topology enabled us to fit a hardened specification. In association with this new topology, we employed an automated design procedure that combines both circuit and full-wave simulations. It is based on a statistical sensitivity study performed by design-of-experiment analysis.

The design of an input quadriplexer is presented. It is based on a novel topology of ring-based dual-band filters. Two 2nd-order dual-band filters are implemented in microstrip technology and measured. These filters are then set in parallel to form the final IMUX dedicated to telecommunications standards: GSM (1.8 GHz), UMTS (2.1 GHz), Wi-Fi (2.45 GHz) and Wi-Max (2.9 GHz). The proposed concepts are validated by measurement results.

Cascaded-rings bandpass filter is presented with dissociated transmission zeros. While the position of the transmission zeros is largely depending on the coupled-line sections of the rings, less coupling level is required in some of the coupled-line sections, and the design will not be limited to some fixed values of impedance throughout the topology. This improves the degree of the liberty in designing cascaded rings filter for high selectivity applications. Three examples that employ three, four and five quarter-wavelength side-coupled ring resonator basic cells are given, where each of them leads to bandpass response of 8th, 11th and 14th order, respectively. While very sharp bandpass response can be achieved, the different positions of transmission zeros also help in improving the out-of-band rejection. An example of realization is presented for a bandpass filter with three rings, on FR4 substrate.

An odd number of one-wavelength ring resonators are proposed to be directly series-connected along a quarter-wavelength of their sides to exhibit a bandpass response with very high rejection level. As each ring presents a dual-mode response, the order of the overall bandpass response will be equal to two times the number of rings being used. Furthermore, the pseudo-elliptic characteristics of the ring resonators will enhance the selectivity of the resulting filter since a transmission zero is obtained at both sides of the passband. An application of the concept is implemented for the case of three series-connected rings that exhibits a 6th order bandpass response centered at 2 GHz. Fabricated on epoxy-glass substrate, the results show a very good agreement between the simulation and measurement with a very good rejection level surpassing 50 dB up to 3.5 GHz.

Very selective fifth order bandpass ring filter is presented based on two series-connected quarter-wavelength side-coupled ring resonators. As the connection between the two quarter-wavelength lines forms a half-wavelength resonator, an extra pole is produced, leading to a total of five poles since each ring resonator presents two poles. This adds to the compactness of the overall filter and improves the selectivity and rejection. Centered at 2 GHz, the filter layout is simulated and implemented on FR4 substrate using microstrips. Filter simulation and measurement results are presented to validate the idea.

This paper presents a wide-band 2nd order bandpass filter based on a dual-mode ring resonator. A slot ring is constructed in the ground plane and coupled to quarter-wavelength microstrip feedlines. This way, the coupling gap between the ring resonator and the quarter-wavelength lines can be reduced to the value of the substrate thickness. Thus, the coupling of the resonator can be improved and the bandwidth of the filter is increased. Simulation and measurement results are proposed throughout the paper to illustrate the concept and to validate the idea.

This article deals with the design of coplanar waveguide band-pass filters in W-band implemented on silicon membrane technology. Several topologies of filters are developed at 94 GHz: broadband filters with stubs, narrow band filters with coupled-lines, and a pseudo-elliptical ring. Different concepts are validated by electromagnetic simulations HFSS and by experimental results. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1393–1397, 2010; Published online in Wiley InterScience (www.interscience. wiley.com). DOI 10.1002/mop.25216

Studies on the achievable range of bandwidth of a side-coupled ring resonator bandpass filter are presented. The elements of the resonator susceptible on varying the filter bandwidth are identified and design solutions are given in order to push the bandwidth to its minimum and maximum values. Based on the side-coupled ring resonator topology, two microstrip filters were designed at 10 GHz to achieve the narrowest and widest bandwidth with respect to insertion losses and technological limitation. Results of the studies with the given technology show that the ring resonator is suitable to address bandwidth from narrow (3.6%) to wide (31%). These concepts are validated through simulations and experiments for filters implemented on alumina substrate.

Designs of three bandpass filters based on quarter wavelength side-coupled ring resonator are presented for V-band applications. Centered at around 60 GHz with three different bandwidths of 2.4%, 6.2% and 11.27%, the filters are designed on a 25-mum-thick benzocyclobutene (BCB) substrate deposited on a 400-mum-thick silicon bulk. In the filter designs, three technology configurations involving multilayer microstrip and coplanar waveguide (CPW) environment are considered to achieve flexibility in coupling. Results from electromagnetic simulations of the filters are presented through this paper.

The choice of membrane technology for filters in W-band was made considering the low dielectric losses observed in previous studies. Within this frequency range, the constraints related to losses and technological feasibility limit heavily the range of achievable impedances. Thus, this limits achievable bandwidth for broadband filters. Moreover for narrowband coupled-lines filters, we were faced with transmission lines shape-factor problems (wider than long). Therefore, we have chosen a narrowband pseudo-elliptic filter topology which has shown its efficiency and promising performances.

This paper deals with the design of bandpass filters in V- and G-frequency band. A comparison between classical shunt-stub filter performances integrated in high resistivity (HR) silicon on insulator technology (SOI), standard CMOS and III-V technology is made. The use of HR SOI demonstrates performances comparable to state of the art III-V technologies up to G-band. These results evidence the impact of HR SOI wafer towards substrate losses reduction. Once the technology has proved its efficiency, implementation of a narrowband coupled-lines bandpass filter with central frequency of 60-GHz was investigated.

International audience; This paper deals with the design of passive band-pass filters in thin film microstrip (TFMS) technology for millimeter-wave application in G-band frequency range. The filters to be designed are realized on a BCB-based technology. Quality of the design method as well as technological process has already been fully tested in W-band at 94-GHz. Thus, transposition to higher frequency is investigated at 180 GHz. In such a frequency range, designers are faced to technological point locks. So as to overcome them, specific design techniques are discussed for several filter realization

This paper deals with the design of passive coplanar devices in the W-frequency band. As long as coplanar transmission lines are correctly dimensioned, analytical models based on quasi-TEM approximation can be used. Such models are associated with a correct definition of the reference planes at the junctions and employed for junction discontinuities, T- and cross-junctions. In order to validate these assertions, simulated and experimental data on classical quarter-wavelength shunt-stub filters are first presented. Then the design of traditional coupled-line filters is examined. The problems in terms of insertion loss associated with these kinds of narrow-band applications are discussed here. Minimization of insertion losses requires increasing the width of the strips. Consequently, the design becomes complex and modeling using transmission-line models less accurate. Nevertheless, as an optimization procedure is needed to tune the filter theoretically, such a very fast design method is necessary. Simulated and experimental results in the range 500 MHz to 110 GHz are compared throughout the paper.

International audience; In this paper we discuss about various modifications of classical coupled-lines narrow bandpass filter to obtain some frequency response improvement. The first modification concerns the broadening of the resonator strip-widths to improve their unloaded Q-factor. The second modification consists in replacing the in/out coupled lines section by tapped lines feeding. Finally a transmission zero is added using a geometrical modification that favor coupling between non-adjacent resonators. The theoretical investigation is carried out through a DOE based sensitivity study using both a circuit modeling approach and a full wave analysis. Theoretical and experimental results on microstrip filters are compared.; In this paper we discuss about various modifications of classical coupled-lines narrow bandpass filter to obtain some frequency response improvement. The first modification concerns the broadening of the resonator strip-widths to improve their unloaded Q-factor. The second modification consists in replacing the in/out coupled lines section by tapped lines feeding. Finally a transmission zero is added using a geometrical modification that favor coupling between non-adjacent resonators. The theoretical investigation is carried out through a DOE based sensitivity study using both a circuit modeling approach and a full wave analysis. Theoretical and experimental results on microstrip filters are compared.

A new topology of narrowband band-pass filter based on modification of classical tapped-line interdigital coupled lines filters is presented. From a sensitivity point of view, this new topology appears as very attractive when designing very narrowband filters. Theoretical and experimental results in coplanar technology are presented. The theoretical study is carried out by both a circuit modelling approach (HP-MDS) and a full wave analysis (Agilent-Momentum).