Abstract
This article presents new structures and methods of design of miniature third-order substrate integrated waveguide (SIW) bandpass filters on a high-permittivity ceramic substrate for the C-band. The aim was to appraise the feasibility of such filters by using a 3D electromagnetic (EM) simulator. The substrate integrated waveguide (SIW) offers good quality factors and electrical performances compared with other planar techniques. Its integration capabilities and fabrication cost are other benefits that make it attractive. Ceramic material offer electrical properties suitable in designing of passive devices. High relative permittivity with low dielectric losses makes it possible to miniaturize passive components while exhibiting high temperature stability, which is an important selection criterion for a filter designed to equip the payload of a satellite. Three SIW filters were designed on a Trans-Tech ceramic substrate (thickness = 254 mm, er = 90, and tand = 0.0009) with drastic specifications for space application. The first filter is composed of three SIW resonators with direct coupling, the second is composed of three SIW resonators with a cross-coupling to create a transmission zero, and the third is composed of three SIW resonators with circular holes etched on the top of the metal layer to achieve a super-wide band. The obtained results for the proposed filters are presented, discussed, and compared with relevant published literature. The proposed filter can be used to enhance the performance of microwave devices used for C-band, especially Satellite communications.
Highlights
Ceramic materials offer relevant dielectric characteristics for the conception of passive devices [1,2]
Two other third-order substrate integrated waveguide (SIW) filters are designed on a substrate with a relative permittivity of 90, the first one with a cross-coupling between resonators to create a transmission zero and the second with circular holes etched on the top of the metal layer to achieve a super-wide bandpass
We have demonstrate that the proposed filter (Fig. 15) has low insertion loss, a good upper stopband (30 dB from 5.6 to 6.6 GHz), and a very compact size compared to the SIW filters presented in [41], which are designed on the same high-K substrate
Summary
Ceramic materials offer relevant dielectric characteristics for the conception of passive devices [1,2]. Some of them reach high relative permittivity while presenting low dielectric losses (tanδ < 0.001) [3,4,5] They show themselves very stable against temperature changes, an essential criterion for a filter used in spatial applications [6]. A substrate integrated waveguide (SIW) allows integration of the rectangular waveguide into a substrate through two arrays of via holes [7,8] These vias must all have the same diameter and must have sufficiently small spacing to appear as perfect electric walls [9,10,11]. We propose to design SIW filters on a high-permittivity ceramic substrate for the C-band in order to achieve drastic specifications for space application with the best compromise between size and electrical performances. The structures will be simulated by using the available Ansoft software High Frequency Structure Simulator (HFSS)
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