On the Study of Left-Handed Coplanar Waveguide Coupler on Ferrite\r\nsubstrate

Abdalla, Mahmoud A.; Hu, Zhirun

doi:10.2528/pierl07111808

Cited by 27 publications

(6 citation statements)

References 14 publications

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“…With the growing interest in designing multi-antennas in wireless communications system, the investigations on compact and multi-band EBG structure has been attractive to many researchers [19][20][21][22][23][24][25][26][27][28][29][30]. In [11], a rabbet EBG structure which consists of concave and convex patches with insert spiral braches was introduced and analyzed.…”

Section: Introductionmentioning

confidence: 99%

A Novel Design Approach for Dual-Band Electromagnetic Band-Gap Structure

Zhang¹,

Liang²,

Liang³

et al. 2008

PIER M

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Abstract-A novel compact dual-band electromagnetic band-gap (EBG) structure is proposed in this paper. The major contribution to this dual-band design is using cascaded mushroom-like units which operate at different frequencies. The position of via is moved off the center of the metal patch to get a lower resonant frequency and the effects of the radius of via are considered at the same time. The method of suspended microstrip is utilized to measure the band-gap characteristics of the EBG structures. Several dual-band EBG structures are designed and compared. Results show that this novel cascaded structure offers additional flexibility in controlling the frequencies of the stopband over a wide range. The cascaded dualband EBG structure has potential application to dual-band antenna and circuit.

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Section: Introductionmentioning

confidence: 99%

A Novel Design Approach for Dual-Band Electromagnetic Band-Gap Structure

Zhang¹,

Liang²,

Liang³

et al. 2008

PIER M

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“…HIGP are a kind of artificial electromagnetic materials that are typically realized by periodic metallic patterns arranged on dielectric substrates, and have electromagnetic characteristics that differ with the patterns, such as negative refraction [1][2][3][4][5], electromagnetic bandgap [6][7][8][9], and high-impedance properties [10][11][12]. Of all the interesting properties, the high-impedance feature is of particular interest.…”

Section: Introductionmentioning

confidence: 99%

High Impedance Ground Plane (Higp) Incorporated With Resistance for Radar Cross Section (Rcs) Reduction of Antenna

Zheng¹,

Yan²,

Cao³

et al. 2008

PIER

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In this paper a novel ultra-thin radar absorbent material (RAM) using HIGP is presented and investigated. Owing to the high impedance property of the HIGP, the thickness of the RAM is about several tenths of the centre wavelength of the absorption band, considerably thinner than conventional absorbers. The absorption band of the RAM is about several hundred megahertz. In the new RAM, lumped resistances are soldered between the patches of mushroom-like high-impedance surface (HIGP). And the metal ground plane of waveguide slot antenna is covered by this new type of RAM. As compared to the slot antenna with a metal ground plane, the measured results show that the radar cross section (RCS) of waveguide slot antenna reduces significantly. This proves that the new HIGP RAM has a good radar absorbing characteristics. The simulations and experiment results have shown that the RCS of antenna is reduced by 7.9 dB and gain is only reduced by 0.9 dB.

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“…The method utilizes the concept of left-handed material (LHM), which has simultaneously negative permittivity and permeability over a certain range of frequencies and thus can act as a phase compensator/conjugator. LHM has not only been plentifully realized and experimentally confirmed [6,7] but also has opened many new possibilities in different applications [8][9][10][11][12][13]. In this method, an active LHM layer with the same thickness as the lossy obstacle layer is imaginatively inserted.…”

Section: Introductionmentioning

confidence: 99%

Imaging of Objects through Lossy Layer with Defects

Cheng¹,

Wu²,

Grzegorczyk³

et al. 2007

PIERS Online

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The imaging method when a lossy layer (e.g., a defected metallic slab or a plasma layer) is present between the target and the sensor is demonstrated using the concept of active left-handed material (LHM). The effect of the lossy layer to the reflection coefficients measured by the receiver can be cancelled by imaginatively adding an active LHM layer, which has a same thickness as the lossy layer but an opposite sign of the constitutive parameters. Therefore, the updated reflection coefficients obtained after this data process look like the lossy layer has been removed, which leads to a significant improvement of the target imaging. When the lossy layer is inhomogeneous due to the existence of small defects, we use a homogenization procedure based on the Drude model to characterize its effective constitutive parameters. Our simulation examples shows the effectiveness of the proposed method.

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On the Study of Left-Handed Coplanar Waveguide Coupler on Ferrite\r\nsubstrate

Cited by 27 publications

References 14 publications

A Novel Design Approach for Dual-Band Electromagnetic Band-Gap Structure

A Novel Design Approach for Dual-Band Electromagnetic Band-Gap Structure

High Impedance Ground Plane (Higp) Incorporated With Resistance for Radar Cross Section (Rcs) Reduction of Antenna

Imaging of Objects through Lossy Layer with Defects

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