Switched-Beam Planar Fractal Antenna

Wu, Weixia; Bi, Yingyu

doi:10.1163/156939306775701786

Cited by 15 publications

(10 citation statements)

References 4 publications

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“…Authors in [22] designed a switched beam-planar fractal antenna. Simulated and measured results in this paper showed that a two switchable directional pattern can be achieved by changing the connection states of the switches within the antenna.…”

Section: Introductionmentioning

confidence: 99%

Multi-Feed Dielectric Resonator Antenna With Reconfigurable Radiation Pattern

Fayad¹,

Record²

2007

PIER

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Abstract-This paper describes a steerable broadband dielectric antenna with 30% fractional bandwidth, operating at 11 GHz. The structure consists of a hollow cylindrical dielectric pellet of permittivity 6 fed by four probes. Two methods are described for beam forming: 1-Beam forming has been achieved by individually switching between excited probes. The switched excitation mechanism provides the antenna with a reconfigurable radiation beam that can be moved in the azimuth plane. 2-Variable phase excitation of several probes. Complete azimuth sweep was demonstrated by both methods, allowing any desired angle of beam directions. Simulation and experimental results are presented to illustrate the advantages of both designs.

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Section: Introductionmentioning

confidence: 99%

Multi-Feed Dielectric Resonator Antenna With Reconfigurable Radiation Pattern

Fayad¹,

Record²

2007

PIER

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“…Fractal [1][2][3] means broken or fractured which is derived from Latin word "fractus" dates back to the 19th century as a branch of classical mathematics. In a roughly words, fractal is in a sense of a total designation of self-similarity figures and structures without characteristic length.…”

Section: Introductionmentioning

confidence: 99%

Novel Microstrip Triangular Resonator Bandpass Filter With Transmission Zeros and Wide Bands Using Fractal-Shaped Defection

Xiao¹,

Chu²,

Zhang³

2007

PIER

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Abstract-Fractal microwave passive circuits are simple and novel structures that attract much attention recently, however, the fractal technique is dominantly applied in antennas. In this paper, some new characteristics of microstrip equilateral triangular patch resonator with fractal defection are analyzed, and novel fractal bandpass filters using equilateral triangular resonator are presented to implement high performances of multi-transmission zeros, wide passband and stopband, and low passband insertion loss as well as miniaturization. Using fractal defection in patch, multi higher order modes are inspired for coupling a much wider passband, and parasitical harmonics are effectively suppressed. A new bandpass filter with a wide passband of about 0.92 GHz (ε r = 9.8) or 2.7 GHz (ε r = 2.2), maximum passband insertion loss of less than 0.5 dB, and multi-transmission zeros at both sides of passband, and a second bandpass filter with wide passband and stopbands of more than 2 GHz are implemented. Compared with some literatures, sizes of the new filters reduced and performances are greatly enhanced. The proposed filters have compact and simple structures, small sizes, high selectivity and so on, and all these features are the requirement of wireless communication circuits.

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“…The geometrical characteristics have a strong impact on the resonances of a radiator, since a proper selection of the geometry can enable the reduction of the overall antenna size simultaneously, guaranteeing a multi-band behavior. Accordingly, several research papers have proposed novel antenna design techniques based on meander line curves and fractal geometry [1][2][3][4][5][6][7][8][9]. In many cases, the selection of the geometry satisfying the design specifications requires accurate electromagnetic simulations and the adoption of proper optimization techniques.…”

Section: Introductionmentioning

confidence: 99%

On the Use of Dimension and Lacunarity for Comparing the Resonant Behavior of Convoluted Wire Antennas

Comisso¹

2009

PIER

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Abstract-This paper analyzes the possibility to use dimension and lacunarity for comparing the resonant behavior of different convoluted wire antennas, including prefractal dipoles. Since previous studies have proved that the Hausdorff fractal dimension is not suitable for antenna comparison purposes, this work proposes the adoption of a different approach for evaluating the dimension by using the measurement at scale δ, which is more suitable for analyzing real phenomena. The results provided by this measure are compared to those obtained by using the average lacunarity. The objective is to verify if, given two convoluted wire dipoles, the dimension and average lacunarity provide sufficient information to infer which dipole exhibits the lower resonances. †

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Switched-Beam Planar Fractal Antenna

Cited by 15 publications

References 4 publications

Multi-Feed Dielectric Resonator Antenna With Reconfigurable Radiation Pattern

Multi-Feed Dielectric Resonator Antenna With Reconfigurable Radiation Pattern

Novel Microstrip Triangular Resonator Bandpass Filter With Transmission Zeros and Wide Bands Using Fractal-Shaped Defection

On the Use of Dimension and Lacunarity for Comparing the Resonant Behavior of Convoluted Wire Antennas

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