Compact Horse Shoe Shape Rat-Race Coupler
01 Feb 2020-pp 612-616
TL;DR: In this paper, the authors presented an unconventional design for a circular rat race coupler operating at 5 GHz frequency, which allows 40% reduction in the size of the coupler as compared with the conventional rat race without compromising on performance.
Abstract: This paper presents an unconventional design for a circular rat race coupler operating at 5 GHz frequency. The size of the novel design implemented is 21.68mm x 15.72mm. The unconventional design of the coupler allows 40% reduction in the size of the coupler as compared with the conventional rat race coupler without compromising on performance. Measured and simulated results of the S-parameters are provided.
Citations
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TL;DR: The coupler miniaturization was realized by exchanging the quarter-wave segments with microstrip cells having comparable characteristics with smaller dimensions, which allowed reducing the space of the coupler by more than 3 times, relative to the standard design.
Abstract: Diagram-forming circuits contain passive microwave devices, such as phase shifters, directional couplers. Various requirements are imposed on such devices, for example, low cost, low weight and size, etc. The layout of a broadband 3 dB coupler functioning at a frequency of 1 GHz is studied. The coupler miniaturization was realized by exchanging the quarter-wave segments with microstrip cells having comparable characteristics with smaller dimensions. Such a replacement, allowed reducing the space of the coupler by more than 3 times, relative to the standard design.
1 citations
References
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TL;DR: In this article, a new type of compact enhanced-bandwidth hybrid ring using an artificial lumped-element left-handed (LH) transmission-line (TL) section is proposed.
Abstract: A new type of compact enhanced-bandwidth hybrid ring using an artificial lumped-element left-handed (LH) transmission-line (TL) section is proposed. The replacement of the 270/spl deg/ branch of the conventional hybrid ring by a -90/spl deg/ LH-TL branch results in both size reduction and bandwidth enhancement. The working principle of the LH TL used in the hybrid ring is explained and the performances of the component are demonstrated by measurement results. The proposed hybrid exhibits 67% size reduction compared to the conventional one, and shows a 58% and 49% bandwidth enhancements at 2 GHz in the 180/spl deg/-out-of-phase and in-phase operations, respectively.
221 citations
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TL;DR: In this paper, a compact folded line configuration for rat-race hybrid couplers is proposed, which exhibits a four-to-fivefold reduction in footprint as compared to the conventional rat race configuration and is validated both by using the full-wave electromagnetic simulator and with measurement.
Abstract: A new, compact folded line configuration for rat-race hybrid couplers is proposed. Simple design equations are presented for the single and double C-section folded line structures. The new configuration exhibits a four- to fivefold reduction in footprint as compared to the conventional rat-race configuration. The design is validated both by using the full-wave electromagnetic simulator and with measurement.
100 citations
"Compact Horse Shoe Shape Rat-Race C..." refers methods in this paper
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TL;DR: In this paper, a compact rat-race coupler is developed using shunt-stub-based artificial transmission lines (SSB ATLs), which can be implemented with a 3.9% circuit size reduction compared to the conventional one.
Abstract: In this letter, a compact rat-race coupler is developed using shunt-stub-based artificial transmission lines (SSB ATLs). A conventional quarter-wavelength microstrip can be equivalent to an SSB ATL realized by two series high-impedance microstrips with the high-impedance branch-type shunt stubs. The circuit configuration of the SSB ATL is beneficial to miniaturize the circuit size using the folding technique. By integrating six SSB ATLs, a compact rat-race coupler can be implemented with a 3.9% circuit size of the conventional one. The measured results of the developed rat-race coupler are in a good agreement with the simulated results by full-wave electromagnetic simulator.
99 citations
"Compact Horse Shoe Shape Rat-Race C..." refers methods in this paper
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TL;DR: In this article, the size of the ring coupler is reduced by connecting multiple open stubs on the inside of a ring, and the results of the miniaturized ring couplers coincide with that of the traditional one, without any lumped element, via hole or wire bond, but only microstrip lines.
Abstract: A simple and successful method for miniaturizing a ring coupler is proposed. The size of the ring coupler is reduced by connecting multiple open stubs on the inside of the ring. There is no need of any lumped element, via hole or wire bond, but only microstrip lines. The reduced size is arbitrary and the results of the miniaturized ring coupler coincide with that of the traditional one.
90 citations
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TL;DR: In this paper, a broadband rat-race ring coupler with a unit element at each port and an ideal phase inverter at one of the ring arms is proposed and analyzed.
Abstract: A novel broad-band rat-race ring coupler with a unit element at each port and an ideal phase inverter at one of the ring arms is proposed and analyzed. Design equations based on Chebyshev equiripple functions are derived. The design curves of equal or unequal power division are also presented. Theoretical data show that the bandwidth of unequal power division with a specific return-loss value increases as the power division ratio increases or decreases from unity. For a 180/spl deg/ hybrid with equal power division (3 dB) and 15-dB return loss, the proposed rat-race ring may have a bandwidth of 4:1. Three circuits of this novel rat-race ring are realized using finite-ground-plane coplanar waveguide. The measured results match very well with the theory.
87 citations
"Compact Horse Shoe Shape Rat-Race C..." refers methods in this paper
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