Conference Paper

Wideband Single-Layer DC-Decoupled Substrate Integrated Waveguide (SIW) - to - Microstrip Transition Using an Interdigital Configuration

Sch. of ECE, Univ. of Tehran, Tehran
DOI: 10.1109/APMC.2007.4555065 Conference: Microwave Conference, 2007. APMC 2007. Asia-Pacific
Source: IEEE Xplore

ABSTRACT

A transition from the substrate integrated waveguide (SIW) to the microstrip line with built-in dc-decoupling is presented. The proposed transition has an interdigital configuration on a single layer. It features a 25% relative bandwidth with less than 0.7 dB of insertion loss and more than 15 dB of return loss.

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    • "Instead, the vias are replaced by quarter wavelength microstrip stubs arranged in a corrugated pattern on the edges of the waveguide. This, along with series interdigitated capacitors [6], results in a waveguide section comprising two separate conductors, which facilitates shunt connection of active components such as Gunn diodes [8]. The concept of this arrangement is shown in Fig. 1 "
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    ABSTRACT: Directional couplers are widely used in microwave or millimeter wave power splitters or antenna feeding circuits for generating desired power division ratio at a specified bandwidth. The bandwidth and size are the two key parameters in the specifications of couplers. A compact coupler could save space and reduce the metal loss, and also the wide band properties will bring a generalized usage of couplers. Rectangular waveguide directional couplers have been seriously investigated for a long time [1]-[3] and numbers of circuits or structures have been obtained to achieve high performance flat coupling properties. However, manufacturing such a coupler requires high accurate machining and thus results in high cost. Substrate Integrated Waveguide (SIW) is a dielectric filled waveguide structure that has the similar propagating modes as rectangular waveguide, but manufacturing of such a waveguide structure requires only the normal Print Circuit Board (PCB) process and results in the merit of low cost and mass production ability. SIW directional couplers also have been successfully designed and fabricated [4]-[5]. But most of the couplers are designed by H-plane wall of two adjacent SIW which is guided wavelength depended and requires large PCB area. Single layer SIW compact size crossed waveguide directional coupler also been mentioned [6], the bandwidth of the coupler is limited. This paper introduced a double layer wide band compact directional coupler with two SIWs crossed over each other. Large range of coupling coefficient and wide band characteristics are achieved. The coupling is realized by the cross slots between upper layer SIW and lower layer SIW. Structures and parameters, simulated and experiment results are presented. Such a coupler could be a good candidate in antenna feeding structure or power divider applications.
    Full-text · Conference Paper · Jan 2009
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    • "Instead, the vias are replaced by quarter wavelength microstrip stubs arranged in a corrugated pattern on the edges of the waveguide. This, along with series interdigitated capacitors [6], results in a waveguide section comprising two separate conductors, which facilitates shunt connection of active components such as Gunn diodes [8]. The concept of this arrangement is shown in Fig. 1 "
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    ABSTRACT: In this work we propose a new SIW structure, called the corrugated SIW (CSIW), which does not require conducting vias to achieve TE<sub>10</sub> type boundary conditions at the side walls. Instead, the vias are replaced by quarter wavelength microstrip stubs arranged in a corrugated pattern on the edges of the waveguide. This, along with series interdigitated capacitors, results in a waveguide section comprising two separate conductors, which facilitates shunt connection of active components such as Gunn diodes.
    Preview · Conference Paper · Jan 2009
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    ABSTRACT: Substrate integrated waveguide (SIW) is a new type of transmission line. It implements a waveguide on a piece of printed circuit board by emulating the side walls of the waveguide using two rows of metal posts. It inherits the merits both from the microstrip for compact size and easy integration, and from the waveguide for low radiation loss, and thus opens another door to design efficient microwave circuits and antennas at a low cost. This book presents a two-dimensional fullwave analysis method to investigate an SIW circuit composed of metal and dielectric posts. It combines the cylindrical eigenfunction expansion and the method of moments to avoid geometrical descritization of the posts. The method is presented step-by-step, with all the necessary formulations provided for a practitioner who wants to implement this method by himself. This book covers the SIW circuit printed on either homogeneous or inhomogeneous substrate, the microstrip-to-SIW transition and the speed-up technique for the simulation of symmetrical SIW circuits. Different types of SIW circuits are shown and simulated using the proposed method. In addition, several slot antennas and horn antennas fabricated using the SIW technology are also given.
    No preview · Article · Mar 2010 · Synthesis Lectures on Computational Electromagnetics
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