A Balun-BPF Using a Dual Mode Ring Resonator

Jung, Eul-Young; Hwang, Hee-Yong

doi:10.1109/lmwc.2007.903442

Cited by 88 publications

(40 citation statements)

References 6 publications

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“…It has been extensively studied for active amplifiers, balanced mixers, passive filter [2] and even antennas [3]. Several types of baluns are available among the open literature, such as the Marchand balun [4][5][6], powerdivider balun [7,8], branch-line balun [9] and metamaterial balun [10].…”

Section: Broadband Balun Using Fully Artificial Fractal-shaped Crlh Tlmentioning

confidence: 99%

Compact Metamaterials Induced Circuits and Functional Devices

Xu¹,

Wang²,

Cai³

et al. 2017

Metamaterials - Devices and Applications

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In recent years, we have witnessed a rapid expansion of using metamaterials to manipulate light or electromagnetic (EM) wave in a subwavelength scale. Specially, metamaterials have a strict limitation on element dimension from effective medium theory with respect to photonic crystals and other planar structures such as frequency selective surface (FSS). In this chapter, we review our effort in exploring physics and working mechanisms for element miniaturization along with the resulting effects on element EM response. Based on these results, we afford some guidelines on how to design and employ these compact meta-atoms in engineering functional devices with high performances. We found that some specific types of planar fractal or meandered structures are particularly suitable to achieve element miniaturization. In what follows, we review our effort in Section 1 to explore novel theory and hybrid method in designing broadband and dual band planar devices. By using single or double such compact composite right-/left-handed (CRLH) atom, we show that many microwave/RF circuits, i.e., balun, rat-race coupler, power divider and diplexer, can be further reduced while without inducing much transmission loss from two perspectives of lumped and distributed CRLH TLs. In Section 2, we show that a more compact LH atom can be engineered by combining a fractal ring and a meandered thin line. Numerical and experimental results demonstrate that a subwavelength focusing is achieved in terms of smooth outgoing field and higher imaging resolution. Section 3 is devoted to a clocking device from the new concept of superscatterer illusions. To realize the required material parameters, we propose a new mechanism by combining both electric and magnetic particles in a composite meta-atom. Such deep subwavelength particles enable exact manipulation of material parameters and thus facilitate desirable illusion performances of a proof-of-concept sample constructed by 6408 gradually varying meta-atoms. Finally, we summarize our results in the last section.

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Section: Broadband Balun Using Fully Artificial Fractal-shaped Crlh Tlmentioning

confidence: 99%

Compact Metamaterials Induced Circuits and Functional Devices

Xu¹,

Wang²,

Cai³

et al. 2017

Metamaterials - Devices and Applications

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“…In the past few years, several techniques have been proposed to design narrow/dual-band and wideband balun bandpass filters [1][2][3][4][5]. Both characteristics of balun and bandpass filter can be easily realized in these filter structures.…”

Section: Introductionmentioning

confidence: 99%

Wideband Balun Bandpass Filter Based on a Balanced Circuit

Yang¹,

Feng²

2014

PIER Letters

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Abstract-A novel wideband balun filter based on a symmetric four-port balanced circuit is proposed in this paper. A pair of open coupled lines is used to realize DC suppression and in-band balance improvement for the balun bandpass filter. The bandwidth can be easily adjusted by changing the characteristic impedance of transmission lines in the balanced circuit. For the proposed balun bandpass filter, excellent in-band balance performance (amplitude and phase imbalance are less than 0.25 dB and 1.3 • respectively) over the passband are achieved. A wideband balun bandpass filter prototype with center frequency 3.75 GHz and 3-dB bandwidth 33.8% is designed and fabricated. Good agreement can be observed between the measured results and theoretical expectations.

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“…L. K. Yeung and K.-L. Wu derived the integrated balun filter based on the center-tapped transformer circuit [8]. A balun filter was also designed using a dual-mode ring resonator which also achieved this integration [9].…”

Section: Introductionmentioning

confidence: 99%

Multi-Function Patch Element

Zheng¹,

Chan²,

Man³

2010

PIER

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Abstract-Integration of multiple functions is for the first time achieved within a single patch circuit element. Firstly, out of phase equal power division and bandpass filter characteristics are combined within a patch element. The novelty of the proposed structure is to use simple asymmetric cross slots in the patch element to achieve this integration. A simplified equivalent circuit model to describe operation of this patch element is proposed. Coplanar waveguide/microstrip broadside coupling is then investigated to enhance the performance of the patch balun filter and eliminate narrow coupling gaps and microstrip lines. Subsequently, transition between microstrip and coplanar waveguide is then added to the patch element by using certain electromagnetic coupling methods for higher level integration without introducing additional loss. Different patch elements operating at 2.4 GHz are developed to validate the feasibility of the proposed structures. The circuits were designed, fabricated and measured. The measured results agree quite well with the simulation, exhibiting small amplitude and phase imbalance at the output ports throughout the desired passband, and good rejection levels elsewhere.

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A Balun-BPF Using a Dual Mode Ring Resonator

Cited by 88 publications

References 6 publications

Compact Metamaterials Induced Circuits and Functional Devices

Compact Metamaterials Induced Circuits and Functional Devices

Wideband Balun Bandpass Filter Based on a Balanced Circuit

Multi-Function Patch Element

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