Integration of Packaged RF MEMS Switches With Radiation Pattern Reconfigurable Square Spiral Microstrip Antennas

Huff, Gregory H.; Bernhard, Jennifer T.

doi:10.1109/tap.2005.863409

Cited by 253 publications

(118 citation statements)

References 10 publications

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“…The application of MEMS includes, but is not limited to, Radio-Frequency (RF) MEMS [1], Optical MEMS [2], and BioMEMS [3], where micro-scale or nano-scale devices can be used as molecular sensors, mechanical actuators, or structural support. In the field of BioMEMS, the major application lies in the realm of sample detection, biochemical reaction, cell cultivation, and/or cell separation.…”

Section: Introductionmentioning

confidence: 99%

Using a Microfluidic Gradient Generator to Characterize BG-11 Medium for the Growth of Cyanobacteria Synechococcus elongatus PCC7942

et al. 2015

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Abstract:The photosynthetic cyanobacterium Synechococcus elongatus PCC7942 has recently gained great attention for its ability to directly convert CO 2 into renewable chemicals upon genetic engineering. Thus, it is of great interest to increase the growth speed and lower the medium requirement for cultivating this cyanobacterium. The cultivation medium of Synechococcus elongatus PCC7942 has been developed, which consists of many inorganic and metal ingredients with a specific composition, known as the BG-11 medium. In this work, we analyzed the concentration effect of each ingredient and identified the absolutely essential components in BG-11 medium for cyanobacteria growth using the concentration gradient generator chip (CGGC) fabricated by MEMS technology. As shown by our results, removal of the individual component sodium nitrate, potassium phosphate, or magnesium sulfate from the BG-11 medium led to severe growth inhibition of Synechococcus elongatus PCC7942. Contrary to our expectation, increasing concentration of the crucial ingredients showed either insignificant or negative impact on cell growth. Overall, standard growth could be achieved without supplementation of ethylenediaminetetraacetic acid (EDTA) disodium, sodium carbonate, or sodium citrate to the culture medium. Further improvement of the CGGC-based microfluidic system based on this preliminary study may broaden its application range to analyze more complicated correlations.

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Section: Introductionmentioning

confidence: 99%

Using a Microfluidic Gradient Generator to Characterize BG-11 Medium for the Growth of Cyanobacteria Synechococcus elongatus PCC7942

et al. 2015

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“…In several methods to improve the performance of such systems, beam switching can be used to enhance the spectral efficiency and reduce the problems associated with multipath propagation. Thus, the beam-steering antenna has been widely investigated [3]- [6]. It is capable of more strongly transmitting and receiving signals in the desired direction and preventing interference with other signals.…”

Section: Introductionmentioning

confidence: 99%

“…It is capable of more strongly transmitting and receiving signals in the desired direction and preventing interference with other signals. Beam-steering antennas are mostly classified into adaptive array antenna using the phase shifter or single reconfigurable antenna using the switches [4]- [6]. The adaptive array antenna is used as the most common type of steerable antenna system and offers better gain than the single reconfigurable antenna.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable Beam-Steering Antenna Using Dipole and Loop Combined Structure for Wearable Applications

Ha¹,

Jung²,

Jung³

2012

ETRI J

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This paper proposes a reconfigurable beam-steering antenna using a bended dipole and a loop. The radiation patterns of the two antennas are cancelled or compensated, and headed towards a specific direction when the dipole and loop antenna are combined at a reasonable ratio. The proposed antenna can steer the beam directions by controlling the operation of two artificial switches. The proposed antenna was manufactured on a PCB (FR-4) and a flexible PCB (polyimide). In the case of the antenna that was fabricated on a PCB, the maximum beam directions were +50°, 0°, and -50° in the azimuth direction using the two artificial switches, and the antenna gain was 1.96 dBi to 2.48 dBi in the operation bandwidth of 2.47 GHz to 2.53 GHz. Also, the antenna was fabricated on a flexible PCB and measured under various bending conditions for wearable applications.

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“…It offers beam steering over 360 degrees in the azimuthal plane with a complex beam steering mechanism. The radiation pattern reconfigurable square spiral microstrip antennas were proposed in [20], where RF MEMS switches were applied to reconfigure the square spiral but the radiation patterns were only reconfigured between endfire and broadside. A beam steering radial line slot array (RLSA) antenna with reconfigurable operating frequency was proposed in [21].…”

Section: Introductionmentioning

confidence: 99%

A Switched-Beam Antenna Using Circumferential-Slots on a Concentric Sectoral Cylindrical Cavity Excited by Coupling Slots

Wounchoum¹,

Worasawate²,

Phongcharoenpanich³

et al. 2011

PIER

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Abstract-This paper presents a switched-beam antenna using circumferential-slot on a concentric sectoral cylindrical cavity excited by coupling slots to operate at 5.8 GHz. The advantages of this antenna are conformal structure, high directivity and capable of switched-beam pattern in six directions. The antenna design starts from a single sector which is capable of switching between radiating and non-radiating modes. The L-shaped coupling slots are proposed to accommodate the switching circuit. Each RF switch is made of two PIN diodes connected in a reverse series connection and placed across the slot at the appropriate location. Subsequently, the exciting probe is designed for matching TM 01 mode of the circular waveguide. The measured results of the proposed antenna give a gain of 7 dBi and |S 11 | less than −20 dB at 5.8 GHz. This antenna is suitable for base station applications that require the switched-beam pattern in the azimuthal plane.

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Integration of Packaged RF MEMS Switches With Radiation Pattern Reconfigurable Square Spiral Microstrip Antennas

Cited by 253 publications

References 10 publications

Using a Microfluidic Gradient Generator to Characterize BG-11 Medium for the Growth of Cyanobacteria Synechococcus elongatus PCC7942

Using a Microfluidic Gradient Generator to Characterize BG-11 Medium for the Growth of Cyanobacteria Synechococcus elongatus PCC7942

Reconfigurable Beam-Steering Antenna Using Dipole and Loop Combined Structure for Wearable Applications

A Switched-Beam Antenna Using Circumferential-Slots on a Concentric Sectoral Cylindrical Cavity Excited by Coupling Slots

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