Wave propagation characteristics of a reactively loaded microstrip

Noujeim, Karam

doi:10.1109/mwsym.2003.1212496

Cited by 11 publications

(10 citation statements)

References 12 publications

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“…To provide deeper physical insight in mechanism, Fig.5 [12], [13], [18], [19], beyond the scope ork. From Fig.4, a nstant can be seen when C j =0.01pF, to ce the leaky-mode it is expected that side to endfire can evaluated range nto the operating mode electric field cavity for different C j at f 0 =5.6GHz.…”

Section: Dispersion Analysis Rementioning

confidence: 99%

“…Several technologies and topologies have been proposed for electronically-controlled LWAs [5]- [21]. In most cases, an active device, such a p-i-n [7], [17] or varactor diode [11]- [13], [15], [16], [19]- [21] allows alteration of the leaky-line boundary conditions of the LWA, affecting the leaky-mode complex propagation constant (k=β-jα) that is propagating through, and producing the associated change in the pointing direction θ RAD (which can be approximately related to the phase constant by sinθ RAD ≈β/k 0 , with θ RAD measured from the broadside direction and k 0 is the free-space wavenumber [2]). …”

Section: Introductionmentioning

confidence: 99%

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Novel topology of Fabry-Perot electronically steerable leaky-wave antenna

Guzman-Quiros

Gómez‐Tornero

Garcia-Vigueras

et al. 2012

2012 6th European Conference on Antennas and Propagation (EUCAP)

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A novel topology of electronically-steerable onedimensional Fabry-Perot leaky-wave antenna (LWA) is proposed. The structure is based on a host parallel-plate waveguide (PPW) which encloses a Fabry-Perot cavity created by two printed-circuits boards (PCB): a top planar partially reflective surface (PRS) and a bottom tunable high impedance surface (HIS) loaded with varactors. The control of the scattering properties of the bottom tunable HIS by the variation of the varactors' capacitance enables control of the Fabry-Perot cavity resonance and thus the scanning of the antenna pointing angle from broadside towards the endfire direction at a fixed frequency. Full-wave simulations obtained with commercial finite element method solver (HFSS) demonstrate as a proof of concept a continuous scanning range of the pointing angle from 5º to 50º at a design frequency of 5.6GHz.

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Section: Dispersion Analysis Rementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel topology of Fabry-Perot electronically steerable leaky-wave antenna

Guzman-Quiros

Gómez‐Tornero

Garcia-Vigueras

et al. 2012

2012 6th European Conference on Antennas and Propagation (EUCAP)

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“…Fixed frequency beam scanning is the right alternative, but new feeding configurations and phase shifter circuits integrated to the antenna are required [3]. As the phase velocity along the microstrip and the cut off frequency of its first higher order mode are functions of the reactance across the slots, capacitive loading along the leaky slot line provides a simple method for fixed frequency beam steering [4,5]. In this letter we propose a MLWA, loaded with MIM capacitors, capable of both frequency scanability and fixed frequency beam steering.…”

Section: Introductionmentioning

confidence: 99%

“…As a typical example, multielement arrays used to create adaptive antennas require the use of one phase shifter per element to allow the control of their radiation pattern. Many technologies can be used for that purpose [1][2][3][4][5]. In this paper we present a phase shifter of very simple design with only one control voltage, which enables the continuous variation of the phase at a frequency of 1.89 GHz.…”

Section: Introductionmentioning

confidence: 99%

Reactive loaded microstrip leaky wave antenna for low cost beam steering applications

Augustin

Shynu

Mohanan

et al. 2006

Micro & Optical Tech Letters

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Magnetic nanoparticles produced by magnetotactic bacterium, bacterial magnetic particles (BacMPs), covered with a lipid bilayer membrane (magnetosome membrane) can be used to separate specific target cells from heterogeneous mixtures because they are easily manipulated by magnets and it is easy to display functional proteins on their surface via genetic engineering. Despite possessing unique and valuable characteristics, the potential toxicity of BacMPs to the separated cells has not been characterized in detail. Here, a novel technique was developed for the reconstruction of magnetosome membrane of BacMPs expressing protein A (protein A‐BacMPs) to reduce cytotoxicity and the newly developed nanomaterial was then used for magnetic cell separation. The development of the magnetosome membrane‐reconstructed protein A‐BacMP was based on the characteristics of the Mms13 anchor protein, which strongly binds to the magnetite surface of BacMPs. Treatment of protein A‐BacMPs with detergents removed contaminating proteins but did not affect retention of Mms13‐protein A fusion proteins. The particle surfaces were then reconstructed with phosphatidylcholine. The protein A‐BacMPs containing reconstructed magnetosome membranes remained dispersible and retained the ability to immobilize antibody. In addition, they contained few membrane surface proteins and endotoxins, which were observed on non‐treated protein A‐BacMPs. Magnetic separation of monocytes and B‐lymphocytes from the peripheral blood was achieved with high purity using magnetosome membrane‐reconstructed protein A‐BacMPs. Biotechnol. Bioeng. 2008;101: 470–477. © 2008 Wiley Periodicals, Inc.

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“…Fixed frequency beam scanning is the right alternative, but new feeding configurations and phase shifter circuits integrated to the antenna are required [1,2]. As the phase velocity along the microstrip and the cut off frequency of its first higher order mode are functions of the reactance across the slots, capacitive loading along the leaky slot line, provides a simple method for fixed frequency beam steering [3,4].In this paper we propose a microstrip slot line leaky-wave antenna, loaded with MIM capacitor, capable of both frequency scannability and fixed frequency beam steering much higher than reported earlier in the band of 4.56 to 5.06 GHz. The proposed antenna design and experimental results are presented.…”

Section: Introductionmentioning

confidence: 99%