Compact Substrate Integrated Coaxial Line Quadrature Hybrid with Harmonic Rejection
01 Dec 2019-
TL;DR: In this paper, a compact substrate integrated coaxial line (SICL) based quadrature hybrid operating at 10 GHz was proposed for X-band communication with controllable harmonic rejection.
Abstract: This article presents a compact substrate integrated coaxial line (SICL) based quadrature hybrid operating at 10 GHz specifically for X-band communication with controllable harmonic rejection. The proposed SICL based compact branch-line coupler utilizes four open-ended coaxial stubs. Design equations are analytically derived using even-odd mode analysis and the range of realizable impedance is graphically determined from the derived equations. Variation in position of transmission zero as a function of open-ended stub's electrical length is illustrated through simulation and a 15 dB harmonic rejection up to 31.8 GHz observed. The fabricated SICL based quadrature hybrid demonstrates a measured fractional bandwidth of 12.24% and occupies only 0.10λ2 g area. Use of compact size and electromagnetically robust passive components designed in SICL technology provides exceptional front-end communication system.
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TL;DR: A brief history of microwave engineering is given in this paper, where the impact of computer-aided design and monolithic microwave integrated circuits on microwave design is examined, along with suggestions for related studies that would be useful to the microwave engineer.
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3,169 citations
01 Sep 2006
TL;DR: In this article, a Lange coupler with operation bandwidth of 66% was used in a multi-port Impulse Radio for ultra wide band applications. And the same technology results particularly suitable to realize passive components for wideband applications.
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164 citations
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101 citations
"Compact Substrate Integrated Coaxia..." refers methods in this paper
...In SIW based circuits, the higher order modes are more closer to the fundamental frequency when compared to other technologies such as microstrip, thereby offering poor out-of the band response....
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...To further reduce the size, slotted 3-dB coupler in half-mode folded SIW [3] has been proposed for operation in X-band....
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...In addition, the size reduction achieved in SIW using half-mode technique compromises on shielding....
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...Substrate integrated waveguide (SIW) gained popularity as a planar alternative to traditional waveguide for implementation of microwave components at higher frequencies....
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...In [2], an equal split compact directional coupler based on conductor backed slotline and half-mode SIW was conceived....
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TL;DR: In this paper, a hybrid half-mode substrate integrated waveguide (HMSIW) and slotline guided-wave structure is introduced and investigated, which achieves a relative bandwidth of 17%~22% with 0.5 dB amplitude imbalance excited at different ports.
Abstract: Conductor-backed slotline suffers from potential problems of mode coupling phenomenon and yields unexpected effects. Previous designs are focused on how to suppress such a mode-to-mode coupling. This unwanted coupling effect may be purposely used to achieve a desired coupling between half mode substrate integrated waveguide (HMSIW) and slotline. In this work, a hybrid HMSIW-slotline guided-wave structure is introduced and investigated. Through a simple and efficient analysis approach, we design and fabricate a 3 dB hybrid HMSIW-slotline directional coupler, which achieves a relative bandwidth of 17%~22% with 0.5 dB amplitude imbalance excited at different ports. This type of substrate integrated hybrid coupler not only presents a compact geometry, but also preserves a great design flexibility compatible with various topologies.
40 citations
"Compact Substrate Integrated Coaxia..." refers methods in this paper
...In [2], an equal split compact directional coupler based on conductor backed slotline and half-mode SIW was conceived....
[...]
TL;DR: In this article, a compact substrate integrated coaxial line (SICL) 3 dB coupler is proposed, designed, fabricated and measured, which maintains good performance but with a remarkable 80 reduction in size.
Abstract: A compact substrate integrated coaxial line (SICL) 3 dB coupler is proposed, designed, fabricated and measured. Compared with some available reports of substrate integrated waveguide 3 dB couplers, this SICL coupler maintains good performance but with a remarkable 80 reduction in size.
34 citations
"Compact Substrate Integrated Coaxia..." refers methods in this paper
...A BLC has been reported in SICL technology [5] utilizing λg/4 transmission lines....
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