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ABSTRACT: This article presents a study of ladder-lattice bulk acoustic wave (BAW) filters. First, a review of BAW technology and filters topologies is addressed. Next, a mixed ladder-lattice BAW filter for application on W-CDMA reception front-ends (2.11–2.17 GHz) is presented. An improved solidly mounted resonators (SMR) technology was used for the filter implementation. The filter synthesis methodology is briefly described. Layout guidelines are discussed enabling an optimized filter design. The filter on-wafer measurement results are as follows: −3.55 dB of insertion loss, −8.7 dB of return loss, an isolation higher than −47 dB at the transmission band (1.92–1.98 GHz) and an improved selectivity (−30 dB at 2.14 GHz ± 60 MHz). Therefore, we can observe that the mixed topology combines the advantages of ladder and lattice networks, having very steep responses and an improved isolation at undesired bands. © 2008 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2008.
International Journal of RF and Microwave Computer-Aided Engineering 06/2008; 18(5):476 - 484. · 0.59 Impact Factor
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ABSTRACT: This paper presents a technique for an transmission zero implementation into the suspended stripline bandpass filters characteristic. Two 3<sup>rd</sup> order filters using the open-loop resonators based on a meandered half-wavelength line topology have been fabricated in order to illustrate these results. Transmission zeroes on both sides of the passband can be achieved.
Microwave and Optoelectronics Conference, 2007. IMOC 2007. SBMO/IEEE MTT-S International; 12/2007
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ABSTRACT: We present a miniaturization technique for square dual-mode resonators. By using the Minkowski fractal iteration it is possible to obtain compact resonators. Furthermore the second harmonic is highly attenuated, thus enhancing the rejection in the upper band. A 4<sup>th</sup> order filter using two dual-mode fractal resonators has been fabricated to illustrate these results. We use the suspended substrate technology to design these resonators but the results can be extended to other technologies.
Electronics, Circuits and Systems, 2006. ICECS '06. 13th IEEE International Conference on; 01/2007
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ABSTRACT: This article presents a study about the design of film bulk acoustic wave resonator (FBAR) filters at higher frequency bands. FBAR filters are expected to replace traditional filter technologies (SAW and ceramic). This is mainly due to their compatibility with silicon low-cost process, enabling mass production and filter integration on above-IC processes. Nonetheless, increasing the operation frequency of FBAR filters, new acoustical and electromagnetic constraints are introduced to the filter design. These new constraints of designing of FBAR filters are presented. Further, a design technique using higher harmonic modes is addressed. This technique enables the realization of FBAR filters for operation at higher frequency bands (X, Ku, K, and Ka) using the same fabrication conditions of FBAR filters in L, S, and C bands. © 2006 Wiley Periodicals, Inc. Int J RF and Microwave CAE 2007.
International Journal of RF and Microwave Computer-Aided Engineering 12/2006; 17(1):115 - 122. · 0.59 Impact Factor
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ABSTRACT: We present a miniaturization technique for square dual-mode resonators. By using the Minkowski fractal iteration it is possible to obtain compact resonators. Furthermore, the second harmonic is highly attenuated, thus enhancing the rejection in the upper band. A fourth order filter using two dual-mode fractal resonators has been fabricated to illustrate these results. We use the suspended substrate technology to design these resonators, but the results can be extended to other technologies. © 2006 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2007.
International Journal of RF and Microwave Computer-Aided Engineering 12/2006; 17(1):41 - 48. · 0.59 Impact Factor
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ABSTRACT: The following discussion presents the design and measurements of a power amplifier for a WCDMA handset application on silicon with a STM BiCMOS 0.25mum process. An analysis of the impact of temperature on linearity especially on adjacent channel power regrowth is proposed
Bipolar/BiCMOS Circuits and Technology Meeting, 2006; 11/2006
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ABSTRACT: This paper presents a BAW-SMR filter using a combined ladder-lattice topology for application in W-CDMA reception front-ends (2.11 - 2.17 GHz). The combined topology allies the advantages of both network types, having very steep responses and high isolation at undesired bands. The design of filter was simulated using a combined 2D EM-acoustical analysis procedure, it presents: 1.6 dB of insertion loss, -10 dB of return loss and isolation higher than -48 dB at TX band (1.92 - 1.98 GHz)
Microwave Conference, 2006. 36th European; 10/2006
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ABSTRACT: This paper presents a synthesis methodology applied to bulk acoustic wave coupled resonator filters (BAW CRF). BAW-CRFs are able to realize wider bandwidth and higher rejection filter responses, but they present smoother roll-off coefficients compared to classical ladder topology. The proposed methodology enables to determine the filter structure dimensions able to synthesize Chebyshev responses. Finally, we address the design of an RF filter applied to the W-CDMA system employing the proposed methodology.
Microwave Conference, 2005 European; 11/2005
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ABSTRACT: Novel compact suspended substrate stripline filters in the Ku band are proposed. Two bandpass trisection filters with asymmetrical characteristics are presented. The use of meandered-line open-loop resonators allows a significant size reduction and either positive or negative cross coupling can be realized. The synthesis is based on the general folded cross-coupled network with parallel resonators and admittance inverters. The suspended substrate technology provides an excellent electrical performance and yields a high quality factor, thus making these filters very attractive for satellite communications systems.
Microwave Conference, 2005 European; 11/2005
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ABSTRACT: This article presents guidelines to design a dual-standard fully-integrated RF receiver front-end (RFFE). The designed front-end consists of two system selection integrated FBAR filters, a dual-standard low-noise amplifier (LNA), an active single-to-differential converter (SDC) and I/Q downconversion mixers. The active blocks use the 0.25-mum 60-GHz f<sub>T</sub> SiGe:C BiCMOS7RF process from STMicroelectronics. The proposed RFFE is targeted to DCS1800 (1805-1880MHz) and W-CDMA-FDD (2110-2170MHz) wireless standards. The availability of integrated FBAR filters in BAW technology, compatible with the used BiCMOS process, enables a very compact solution through a module integration
Integrated Circuits and Systems Design, 18th Symposium on; 10/2005
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ABSTRACT: This paper presents several techniques in order to improve the trade-off linearity/efficiency in power amplifiers for WCDMA application. First of all, the study of a differential bipolar linearizer is addressed; second, the consumption control via switched biases and power cells. Simulations were carried out with a BiCMOS process and they show a 27 dBm linear power amplifier (PA) output power with a power added efficiency up to 35% and a 31 dBm maximum output power with a 45% power added efficiency (PAE).
Microwave and Optoelectronics, 2005 SBMO/IEEE MTT-S International Conference on; 08/2005
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ABSTRACT: We present two bandpass trisection filters with asymmetrical characteristics in the suspended substrate technology. The open-loop resonators are based on a meandered half-wavelength line topology thus allowing a significant size reduction. The design of these filters follows two steps: A synthesis based on the extraction of the general cross-coupled folded network parameters and coupling matrix, then the relationship between the resonators' spacings and coupling coefficients is obtained thanks to full-wave electromagnetic simulations. Transmission zeros on both sides of the passband can be achieved.
Microwave and Optoelectronics, 2005 SBMO/IEEE MTT-S International Conference on; 08/2005
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ABSTRACT: This paper presents the design of a bulk acoustic wave coupled-resonator filter (BAW-CRF) for application in the WLAN 802.11a European band (5.15 GHz 5.35 GHz). The presented design methodology allows retrieving the filter structure dimensions (layer thicknesses and electrode areas) based on the extraction of an equivalent network from Chebyshev expressions. The BAW CRF can be fabricated on top of silicon substrates. The designed filter consists in a very compact solution (180 μm × 115 μm), having 2 dB of insertion loss and 48 dB of attenuation at the rejection band.
Microwave and Optoelectronics, 2005 SBMO/IEEE MTT-S International Conference on; 08/2005
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ABSTRACT: A design method for a suspended substrate stripline bandpass filter with one transmission zero at a given frequency is presented. We use a generalized Chebychev lowpass prototype based on admittance inverters and parallel resonators. The filter topology is called "Capacitive gap-parallel coupled line filter" because the synthesis is based on the equivalent circuits of parallel-coupled lines and end-coupled (gap) lines. A CAD software has been developed for the synthesis of such suspended substrate filters and a prototype filter at 8.5 GHz is given as an example.
Electronics, Circuits and Systems, 2003. ICECS 2003. Proceedings of the 2003 10th IEEE International Conference on; 01/2004
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ABSTRACT: In space, microwave bend filters applications are often encountered. Our researches are in keeping with the general pattern of straight and curved waveguide filter structures. More particularly, evanescent modes raise a tremendous interest. An efficient VisualC++ CAD tool has been already developed on CNES behalf for these filtering straight structures at X-band. A genetic algorithm (GA) optimization completed it to carry out the filter synthesis. The accuracy of this computed mode-matching technique applied to an evanescent mode straight waveguide was confirmed by many prototypes. We proceed with the analysis of waveguide bends in order to replace dielectric insert terms. Thus, the objective of this paper is to describe an efficient and simple method to model waveguides with bends, applied to the synthesis of high power filtering structures. In this paper, we are focusing on the bend study and on the critical problem of the straight/curved waveguide discontinuity too, before the plotted results.
Microwave and Optoelectronics Conference, 2003. IMOC 2003. Proceedings of the 2003 SBMO/IEEE MTT-S International; 10/2003
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ABSTRACT: Receiver design for digital radar and optical communication involves optimization and realization of an equalizing filter to provide a suitable signal at the input to the decision circuit. A frequently encountered problem in filter design is the realization of a network with a specified frequency transfer characteristic. In this paper, the optimization of band pass characteristics is considered. Our approach is to approximate the target by the real frequency (RF) method, which gives directly the elements of the equalizing filter. The method is illustrated by the design of a filter for a radar communications receiver.
Microwave and Optoelectronics Conference, 2003. IMOC 2003. Proceedings of the 2003 SBMO/IEEE MTT-S International; 10/2003
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ABSTRACT: In this paper, we give two rectangular realizations of a new structure able to improve an elliptic function. This structure overcomes the difficulties met when the electromagnetic analysis of a circular structure is performed. First, we describe a design procedure of this new type and two sets of experimental results are presented to illustrate the accuracy between theory and performance. This new configuration can create zeros at the right or left hand of the band. With a very powerful computational electromagnetic analysis, the design needs less tuning. To validate this new concept of filtering, we present the measurements of two TE<sub>10</sub>/TE<sub>30</sub> rectangular dual-mode filters.
Microwave and Optoelectronics Conference, 2003. IMOC 2003. Proceedings of the 2003 SBMO/IEEE MTT-S International; 10/2003
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ABSTRACT: In order to reduce the size of microwave waveguide filters, triple
and quadruple mode filters in circular waveguide have been investigated
intensively. However, the research for such filters in rectangular
waveguide is still poor and the rare trials have led to complicated
sensible structures with loaded cavities. This paper describes a fourth
order filter with two transmission zeroes obtained with only one basic
rectangular cavity and two irises. Neither coupling nor tuning screws
are needed. The analysis at the discontinuities is performed by the
moment method. The synthesis lies on an optimization method based on the
genetic algorithm
Microwave Symposium Digest, 2002 IEEE MTT-S International; 02/2002
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ABSTRACT: Satellite communications are used extensively today. The
separation of the different frequency channels requires greater
selectivity. Designers have unanimously adopted the circular filters to
do this task. But the circular waveguides require a very long, hard
development process. We present, in this paper, a new method of
filtering based on rectangular geometry. We give a new synthesis
procedure and we show that this original configuration can create zeros
at right or left hand of the band. With a very powerful computational
circuit and electromagnetic analysis, the design needs less tuning. To
validate this new concept of filtering, we present the measurements of
two TE<sub>10</sub>/TE<sub>30</sub> rectangular dual-mode filters
Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on; 02/2002
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ABSTRACT: This paper presents results of synthesis and optimization for
active and integrated microwave filters. The method is based on the real
frequency theory. The gain, bandwidth, VSWR and group delay are the
optimized characteristics. Optimization is done with the More (1978)
subroutine which is an improvement of the Levenberg-Marquardt algorithm.
These integrated active low-pass and bandpass filters are used in the
field of telecommunications. Applications are given with one or several
FET, several equalizers and attenuation poles which are necessary for
filters. Lowpass and bandpass examples are given in microwave domains.
The responses of filters can have an asymmetric frequency
characteristics. A CAD program has been written and named FREELCD. We
give the different subroutines and show that FREELCD is useful for
microwave integrated active filters
Radio and Wireless Conference, 1998. RAWCON 98. 1998 IEEE; 09/1998
