Journal ArticleDOI
A uniplanar compact photonic-bandgap (UC-PBG) structure and its applications for microwave circuit
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TLDR
In this article, the photonic bandgap (PBG) structure for microwave integrated circuits is presented, which is a two-dimensional square lattice with each element consisting of a metal pad and four connecting branches.Abstract:
This paper presents a novel photonic bandgap (PBG) structure for microwave integrated circuits. This new PBG structure is a two-dimensional square lattice with each element consisting of a metal pad and four connecting branches. Experimental results of a microstrip on a substrate with the PEG ground plane displays a broad stopband, as predicted by finite-difference time-domain simulations. Due to the slow-wave effect generated by this unique structure, the period of the PBG lattice is only 0.1/spl lambda//sub 0/ at the cutoff frequency, resulting in the most compact PEG lattice ever achieved. In the passband, the measured slow-wave factor (/spl beta//k/sub 0/) is 1.2-2.4 times higher and insertion loss is at the same level compared to a conventional 50-/spl Omega/ line. This uniplanar compact PBG (UC-PBG) structure can be built using standard planar fabrication techniques without any modification. Several application examples have also been demonstrated, including a nonleaky conductor-backed coplanar waveguide and a compact spurious-free bandpass filter. This UC-PBG structure should find wide applications for high-performance and compact circuit components in microwave and millimeter-wave integrated circuits.read more
Citations
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Wire antennas near artificial impedance surfaces
TL;DR: In this article, the operation of artificial impedance surfaces as screens between mobile phone antennas and the head is considered, and it is established that structures with moderatealues of the surface impedance proide a possibility to use screens of reasonably small sizes, with a tradeoff of a certain reduction in the antenna gain.
Journal ArticleDOI
Design of Multipassband Microstrip Branch-Line Couplers With Open Stubs
Ching-Wen Tang,Ming-Guang Chen +1 more
TL;DR: In this paper, the microstrip branch-line coupler with multiple passbands is proposed, where open stubs are added to the conventional branch line coupler's ports, and the impedance and electrical length of these stubs need to be properly chosen.
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Compact acoustic bandgap material based on a subwavelength collection of detuned Helmholtz resonators
Jordan Fey,William M. Robertson +1 more
TL;DR: In this paper, the amplitude and phase transmission of audio-frequency sound through a waveguide side-loaded with a series of closely spaced and sequentially tuned Helmholtz resonators is explored.
Journal ArticleDOI
Metallic photonic crystals
TL;DR: Lourtioz et al. as discussed by the authors reviewed some recent results on metallic photonic crystals and their potential applications to microwave circuits and antennas and successively addressed ultra-compact structures such as highimpedance surfaces, electrically controllable photonic band gaps and left-handed materials.
Journal ArticleDOI
Analysis of multilayer frequency selective surfaces on periodic and anisotropic substrates
TL;DR: In this paper, a semi-analytical method for the analysis of a frequency selective surface consisting of patches printed on substrates having periodic inhomogeneity and both electric and magnetic anisotropy is presented.
References
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Proceedings Article
Photonic crystals
Igor S. Nefedov,M. Marciniak +1 more
TL;DR: In this paper, the authors describe photonic crystals as the analogy between electron waves in crystals and the light waves in artificial periodic dielectric structures, and the interest in periodic structures has been stimulated by the fast development of semiconductor technology that now allows the fabrication of artificial structures, whose period is comparable with the wavelength of light in the visible and infrared ranges.
Book
Microstrip Lines and Slotlines
TL;DR: In this article, the authors present a quasi-static analysis of an Enclosed Microstrip and a Slot-Coupled Microstrip Line, as well as a fullwave analysis of Discontinuity Inductance Evaluation.
Journal ArticleDOI
Photonic band-gap structures
TL;DR: In this article, the photonic band gap structures, those three-dimensional periodic dielectric structures that are to photon waves as semiconductor crystals are to electron waves, are discussed.
Journal ArticleDOI
Coplanar Waveguide, a Surface Strip Transmission Line Suitable for Nonreciprocal Gyromagnetic Device Applications
TL;DR: In this article, the coplanar waveguide is used for non-reciprocal magnetic device applications because of the built-in circularly polarized magnetic vector at the air-dielectric boundary between the conductors.