Showing papers by "Dominique Cros published in 1998"
TL;DR: In this article, high-performance planar micromachined filters at 37 and 60 GHz are presented, which consist of a 3.5% bandwidth two-pole Chebyshev filter with transmission zeros at 37 GHz, 2.7% and 4.3% bandwidth four-and five-pole chebbershev filters at 60 GHz, and an 8% bandwidth elliptic filter at 60GHz.
Abstract: High-performance planar micromachined filters at 37 and 60 GHz are presented. The filters consist of a 3.5% bandwidth two-pole Chebyshev filter with transmission zeros at 37 GHz, 2.7% and 4.3% bandwidth four- and five-pole Chebyshev filters at 60 GHz, and an 8% bandwidth elliptic filter at 60 GHz. Silicon micromachining techniques combined with micropackaging have been applied to allow for very high-Q resonators resulting in low-loss filters. The 37-GHz two-pole filter exhibits a 2.3-dB port-to-port insertion loss. The 2.7% and 4.3% four- and five-pole Chebyshev filters at 60 GHz exhibit 2.8- and 3.4-dB insertion loss, and the 8% elliptic filter exhibits a 1.5-dB insertion loss. These values show a large reduction of insertion loss compared to conventional planar techniques, and can be used for planar low-cost millimeter-wave wireless communication systems.
182 citations
01 Oct 1998
TL;DR: In this paper, a coplanar micro-machined line, embedded between two tapers and probe pads and featuring an overall insertion loss of less than 0.8 dB at up to 67 GHz has been achieved.
Abstract: In this paper, we present technological (LIGA U.V) and design improvements, through 3D electromagnetic simulations, in a coplanar micro-machined technology on silicon substrate. First, because of the silicon anisotropic etching, we have designed a low loss tapered transition between the 50 ? silicon input/output lines and the membrane area. A coplanar micro-machined line, embedded between two tapers and probe pads and featuring an overall insertion loss of less than 0.8 dB at up to 67 GHz has been achieved. From these improvements, we have realised a 30 GHz band pass filter featuring insertion loss of ?1.6 dB. Finally, we have designed and realised an original cavity resulting from a coupling between coplanar micro-machined lines and a dielectric resonator acting on whispering gallery modes. The results report on high quality factor (QL) of 2400 at 35 GHz.
5 citations
13 Nov 1998
TL;DR: In this article, a 6 mm length micromachined coplanar transmission line, embedded between two tapers and probe pads, and featuring an overall insertion loss of less than 0.8 dB at up to 67 GHz has been achieved.
Abstract: This paper deals with an original approach for the design and realization of high performance micromachined millimeter wave passive circuits on silicon. Full wave finite element 3D and 2D simulations techniques has been done to design the structures. First, because of the silicon anisotropic properties, we have designed a low loss tapered transition between the 50 (Omega) silicon input/output lines and the micromachined circuit. In order to minimize ohmic losses, new technological processes have been implemented. A 6 mm length micromachined coplanar transmission line, embedded between two tapers and probe pads, and featuring an overall insertion loss of less than 0.8 dB at up to 67 GHz has been achieved. From this technology, we have realized a high quality factor cavity in the 35 GHz range through an appropriate coupling between a micromachined coplanar line and a dielectric resonator acting on it whispering gallery modes. This original structure features a loaded Q of about 2000.
3 citations
01 Oct 1998
TL;DR: In this article, an original topology of dielectric resonator acting on whispering gallery modes for the design of filters for telecommunication systems applications has been discussed and a miniaturized volumic two poles filter using two quarter cut resonators coupled to two microstrip lines is presented.
Abstract: This paper discusses the utilization of an original topology of dielectric resonator acting on whispering gallery modes for the design of filters for telecommunication systems applications. A miniaturized volumic two poles filter using two quarter cut resonators coupled to two microstrip lines is presented. Experimental elliptic filter has been realized to prove the efficiency of this new topology.
1 citations