Bandwidth Enhancement of Microstrip Antennas with Metamaterial Bilayered Substrates

Yang, Rui; Xie, Yongjun; Li, D.; Zhang, J.; Jiang, Jun

doi:10.1163/156939307783134425

Cited by 20 publications

(16 citation statements)

References 23 publications

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“…There also shows an extraordinary strong nonlinear dispersion at wavelengths close to the bandgap, and photonic crystals can refract abnormally light at these wavelengths under certain conditions as if they had a negative refractive index, which is referred to as negative refraction effect [18][19][20][21][22][23][24][25][26][27]. In photonic crystals, light travels as Bloch waves, which travel through crystals with a definite propagation direction despite the presence of scattering.…”

Section: Introductionmentioning

confidence: 99%

Negative Refraction by Photonic Crystal

Srivastava¹,

Srivastava²,

Ojha³

2008

PIER B

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Abstract-Negative refraction has been the subject of considerable interest and it may provide the possibility of a variety of novel applications. It arises in metamaterials that have simultaneous negative permittivity ε and permeability µ, where in-homogeneities are much smaller than the wavelength of the incoming radiation. Recently it has been shown that photonic crystals (PCs) may also exhibit negative refraction although they have a periodically modulated positive permittivity ε and permeability µ. We have theoretically studied the negative refraction in one-dimensional (1D) photonic crystals (PCs) consisting dielectric ZnSe with air. By using transfer matrix method and block theorem we have studied the photonic band structure and group velocity and with the help of group velocity we have obtained the frequency bands of negative refraction. We found that negative refraction may occur near the low frequency edge of the second and fourth bandgaps. We have also studied the effective index of refraction and the transverse position shift through PC that can characterize negative refraction more explicitly.

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Section: Introductionmentioning

confidence: 99%

Negative Refraction by Photonic Crystal

Srivastava¹,

Srivastava²,

Ojha³

2008

PIER B

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“…Some of them resort to the material side by using thicker or bilayered substrate [1,2] or reducing the dielectric constant [3]. Some of them solve the problem from the structure side by using array technique [4] or by using gap-coupled method [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Enhance Gain and Bandwidth of Circularly Polarized Microstrip Patch Antenna Using Gap-Coupled Method

Chang

Jiang²

2009

PIER

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Abstract-In this paper, one 3 × 3 and one 5 × 5 antenna arrays are studied. In each array, one probe-fed circularly polarized (CP) microstrip patch antenna is placed at the center as the driven antenna and is gapped coupled to the remaining elements. It is investigated that CP performance of the patch can be proved by properly arranging these parasitic elements. The driven patch is a perturbed square one with two diagonal corners truncated. The remaining elements are square patches slightly smaller than the driven patch. The proposed antennas have been constructed and measured. The 3 × 3 array has a measured gain of 7.7 dBic with a 3 dB axial ratio bandwidth of 3.3%. The 5 × 5 array has a measured gain of 9.3 dBic with a 3 dB axial ratio bandwidth of 8.1%.

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“…However, the theoretical values obtained by using both these two theoretical methods are also not in very good agreement with the experimental results of both electrically thin and thick rectangular microstrip antennas [3][4][5]. For these reasons, some numerical/experimental methods for the analysis of microstrip antennas is worked out [6][7][8][9]. In this work an advanced nonlinear learning machine, "Support Vector Machine (SVM)" is employed in analyzing the rectangular patch antenna, which enable to generalize 'discrete' data into the 'continuous' domain.…”

Section: Introductionmentioning

confidence: 99%

Support Vector Characterisation of the Microstrip Antennas Based on Measurements

Tokan¹,

Güneş²

2008

PIER B

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Abstract-In this work, Support Vector Machine (SVM) formulation is worked out based upon "L" measured data for the resonant frequency, operation bandwidth, input impedance of a rectangular microstrip antenna. Results of the formulation are compared with the theoretical results obtained in literature, much better characterization is observed with greater accuracy. At the same time, Artificial Neural Network (ANN) is employed in generalization of the data on the resonant frequency, operation bandwidth, and input impedance of the antenna. Performances of the two advanced nonlinear learning machines are compared and superiority of the SVM is verified.

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Bandwidth Enhancement of Microstrip Antennas with Metamaterial Bilayered Substrates

Cited by 20 publications

References 23 publications

Negative Refraction by Photonic Crystal

Negative Refraction by Photonic Crystal

Enhance Gain and Bandwidth of Circularly Polarized Microstrip Patch Antenna Using Gap-Coupled Method

Support Vector Characterisation of the Microstrip Antennas Based on Measurements

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