Yann Clavet

Planar tri-band filter based on dual behavior resonator (DBR)

This paper reports on the application of dual behavior resonators to design triband filters. The principle is briefly presented by considering monoband, dual-band and triband filters. A circuit is proposed by using an approximate synthesis. Then, a hybrid (electromagnetic / circuit) simulation is performed to take into account the parasitic effects induced by the junction discontinuities and to allow a fast triband optimization in the same time. An example of layout with associated simulated and experimental results is proposed.

General Synthesis of

This letter deals with a general method and synthesis devoted to the achievement of N-band resonators. The general topology is based on the dual behavior resonator. Indeed, this kind of topology allows the independent control of different transmission zeros and resonances. Thus, the topology proposed in this study consists of a parallel association of N+1 different bandstop structures to get N bandpasses separated by a transmission zero. After introduction of the general synthesis, the principle will be validated by the achievement of a four-band resonator in microstrip technology

N

This paper deals with miniaturized and wide band bandpass filter. This filter is based on an original topology based on series and parallel resonators. Series resonators are realized using open-ended coupled lines and parallel resonator is implemented using an open-ended stub. This hybrid topology based on two kinds of stub leads to a twice more compact 5th order design compared to the conventional 5th order approach. Moreover, the use of resonators presenting different periodic behaviors implies additional transmission zeros and so, enhances the rejection of the filter. Liquid crystal polymer (LCP) is chosen by considering its low cost, good and stable RF performance over the frequency of interest and its ability to act both as a substrate and a package to obtain wide band filter. So, the combined use of this technology and this topology leads to a filter that presents very good electrical performances in a reduced occupied area. A compact wideband filter (2.38-4.2 GHz) with insertion loss of 1.2 dB and rejection has been designed by using a full-wave analysis and measurements are presented.

-Band Resonator Based on

This letter presents a fourth-order quasi elliptic bandpass filter based on a multilayer technology. Thanks to the use of the third dimension, multilayer technology appears as a very convenient solution when a high coupling is required. This led us to use a coupling coefficient-based approach to design a very compact filter through the association of open-loop resonators and floating metallic patches to elevate coupling.

N

This paper deals with the design of cross-coupled microstrip dual behavior resonator (DBR) filters. It evidences the several ways of cross-coupling DBR filters to get, in particular, either a high level rejection or a flat group delay with a 4th-order filter. The two coupling structures described here are based on the DBR to allow a positive or negative cross-coupling effect. In order to validate this concept three different filters were realized on an alumina substrate. Simulation and experimental data are compared and discussed

-Order Dual Behavior Resonator

This paper reports on the design of a 24 GHz bandpass filter. This device is developed in a multilayer BCB-Si technology to ensure the development of the system on a unique chip. Moreover the technique of integration of semi-lumped lowpass filters in bandpass filter is used to reduce the global size and eliminate spurious response of the filter. The general method to design this kind of filters is described and experimental results are presented.

Wide band, high rejection and miniaturized fifth order bandpass filter on LCP low cost organic substrate

This paper presents a C-band planar filter miniaturized through use of high-permittivity substrates to meet the specifications. The drawbacks associated to such substrates are briefly recalled. To overcome them, the filter under study was based on the DBR topology and realized on a high-K commercial substrate. This ceramic has a relative permittivity of 90 and a low dielectric tangent (tanδ < 10−3). Finally, the results of simulations and measurements are presented and discussed, particularly the footprint reduction.

C-Band Multilayer Bandpass Filter Using Open-Loop Resonators With Floating Metallic Patches

The miniaturization of embarked devices remains a major concern in the space sector. Alternative solutions based on the use of new ceramic materials with very high dielectric permittivity, enhanced electric properties and high temperature stability are worth being investigated. This paper reports on the design of an UHF-microstrip bandpass filter with drastic specifications and based on such a dielectric substrate of relative permittivity εr = 90. Simulation and measurement results highlight some of the possibilities offered by these particular materials.

Cross-Coupled Microstrip Dual Behavior Resonator (DBR) Filter

The miniaturization of embarked devices remains a major concern in many applications and in particular in the space domain. Alternative solutions based on the use of ceramic materials with very high dielectric permittivity, enhanced electric properties and high temperature stability are worth being investigated. This paper presents the design of a 720 MHz central frequency microstrip bandpass filter. This filter use a ceramic with a relative permittivity ¿r = 90. Simulations, and measurements over a large range of temperature are presented.

Miniaturized and out-of-band improved bandpass filter in Si-BCB technology

This paper describes an original solution used to realize a C-band planar filter for a given space application. Because of the particular and strong specifications for the filter, a classical topology is forbidden. The proposed solution is, thus, based on the use of dual behavior resonators where high frequency stubs are oversized to increase the rejection at a specific frequency. Low-pass structures are also integrated in order to suppress spurious resonances. Two frequency planes with different local oscillators (LO) frequencies are studied. Simulated and experimental data are compared.