Metamaterial-Based Electronically Controlled Transmission-Line Structure as a Novel Leaky-Wave Antenna With Tunable Radiation Angle and Beamwidth

Lim, Sungjoon; Caloz, Christophe; Itoh, T.

doi:10.1109/tmtt.2004.838302

Cited by 275 publications

(163 citation statements)

References 28 publications

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“…To find the values of the constants a i , we obtain the partial derivatives of the previous error function with regard to a i and force them to be equal to zero [32] as (13) for i = 1,2,3,4. Following this least-squares approach, four independent equations for the constants a i are obtained.…”

Section: Discussion On the Synthesis Of Ocsrrsmentioning

confidence: 99%

“…Thanks to the presence of such additional elements, metamaterial transmission lines exhibit functionalities not easily achievable in conventional lines, mostly related to the fact that their dispersion can be engineered or tailored to satisfy certain requirements. This extra controllability of the dispersion diagram (and characteristic impedance as well) has open the door to the design and implementation of enhanced bandwidth components [5][6][7], multiband and multifunctional devices [8][9][10], compact filters and diplexers [11,12], backfire-toendfire leaky wave antennas [13,14], etc.…”

Section: Introductionmentioning

confidence: 99%

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Automated synthesis of transmission lines loaded with complementary split ring resonators (CSRRs) and open complementary split ring resonators (OCSRRs) through aggressive space mapping (ASM)

et al. 2014

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This paper is focused on the application of space mapping optimization to the automated synthesis of transmission lines loaded with complementary split ring resonators (CSRRs) and open complementary split ring resonators (OCSRRs). These structures are of interest for the implementation of resonant-type metamaterial transmission lines, and for the design of planar microwave circuits based on such complementary resonators. The paper presents a method to generate the layouts of CSRR-and OCSRRloaded microstrip lines from the elements of their equivalent circuit models. Using the so-called aggressive space mapping (ASM), a specific implementation that uses quasi-Newton type iteration, we have developed synthesis algorithms that are able to provide the topology of these CSRR-and OCSRR-loaded lines in few steps. The most relevant aspect, however, is that this synthesis process is completely automatic, i.e., it does not require any action from the designers, other than initiate the algorithm. Moreover, this technique can be translated to other electrically small planar elements described by lumped element equivalent circuit models.

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Section: Discussion On the Synthesis Of Ocsrrsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Automated synthesis of transmission lines loaded with complementary split ring resonators (CSRRs) and open complementary split ring resonators (OCSRRs) through aggressive space mapping (ASM)

et al. 2014

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“…It has a wide phase shifting range, but the output phases are discretely determined depending on the number of loaded line cells, with a relatively large insertion loss of about 2.7 dB. An metamaterial (MTM)-based electronically controlled transmission line (TL) structure was proposed in [2] as a leaky-wave antenna, with its phase controlled using only one bias voltage. However, since its only optimal impedance matching was sought, it has relatively large reflection coefficients near the center frequency of 3.33 GHz.…”

Section: ⅰ Introductionmentioning

confidence: 99%

Compact Metamaterial-Based Tunable Phase Shifter at 2.4 GHz

Jung¹,

Lee²

2013

Journal of electromagnetic engineering and science

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A compact metamaterial (MTM)-based tunable phase shifter consisting of four unit cells with a simple DC bias circuit has been designed at 2.4 GHz. The variable series capacitors and shunt inductors that are required to be loaded periodically onto a host transmission line are realized employing only chip variable capacitors (varactors). In addition, the proposed phase shifter requires only one DC bias source to control the varactors, with the matching condition of the MTM line automatically satisfied. The measured phase shifting range is 285.2° (from -74.2° to 211°). The measured insertion loss is approximately 1.5 dB. The circuit/electromagnetic-simulated and measured results are in good agreement.

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“…In this region, the propagation constant β varies from the negative to positive values, enabling continuous beam-scanning capability from the backfire to endfire directions. Based on this unique feature, a large number of CRLH leaky-wave antennas have been proposed [9,[12][13][14]. In the ordinary approach that was used to implement these CRLH leaky-wave antennas, the transmission line parameters, such as the interdigital capacitors in the microstrip line or interdigital slots on the top metallization of the SIW, are not only responsible for the radiation efficiency but also for maintaining the balanced condition.…”

Section: Introductionmentioning

confidence: 99%

Novel Composite Right/Left-Handed Leaky-Wave Antennas Based on the Folded Substrate-Integrated-Waveguide Structures

Yang¹,

Chi²,

Xu³

2012

PIER C

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Abstract-In this paper, novel composite right/left-handed (CRLH) leaky-wave antennas based on folded substrate-integrated-waveguide (FSIW) structures are proposed. The proposed leaky-wave antennas were realized by periodically loading the radiating slots on the top metallization of the FSIW-based CRLH transmission lines. The structural advantages of the FSIW combined with the unique dispersion characteristics of the CRLH transmission line enable the proposed leaky-wave antennas to present continuous beam-scanning capability from backfire to endfire directions, occupy smaller footprint size, and provide more design flexibility than the conventional CRLH leaky-wave antennas. Two of such CRLH leaky-wave antennas were developed. In addition to the continuous beam scanning, it is found that the radiation efficiency and polarization of the FSIW-based leakywave antennas can be easily tuned by means of the slot size and slot orientation, respectively, indicating their potential for versatile applications. Calculated and experimental results are presented and compared. A good agreement is obtained. To the best of our knowledge, it is the first time that the leaky-wave antenna exploits both of the dispersion behavior of the CRLH transmission lines and the structural benefits of the FSIW configuration.

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Metamaterial-Based Electronically Controlled Transmission-Line Structure as a Novel Leaky-Wave Antenna With Tunable Radiation Angle and Beamwidth

Cited by 275 publications

References 28 publications

Automated synthesis of transmission lines loaded with complementary split ring resonators (CSRRs) and open complementary split ring resonators (OCSRRs) through aggressive space mapping (ASM)

Automated synthesis of transmission lines loaded with complementary split ring resonators (CSRRs) and open complementary split ring resonators (OCSRRs) through aggressive space mapping (ASM)

Compact Metamaterial-Based Tunable Phase Shifter at 2.4 GHz

Novel Composite Right/Left-Handed Leaky-Wave Antennas Based on the Folded Substrate-Integrated-Waveguide Structures

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