A Near Field Focused Microstrip Array for a Radiometric Temperature Sensor

Stephan, Karl; Mead, J.B.; Pozar, D.M.; Wang, L.; Pearce, John A.

doi:10.1109/tap.2007.893429

Cited by 142 publications

(66 citation statements)

References 6 publications

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“…Leaky-wave lens is another type of well-studied configuration to achieve near-field focusing [9][10][11]. Many researchers take advantage of planar antenna array (composed of microstrip elements, for instance) to achieve focusing in the near-zone [12][13][14][15][16][17][18][19][20]. Compared to the above methods, retro-reflective beamforming technique focuses electromagnetic fields with the aid of pilot signal such that the focal point coincides with the location from which the pilot signal is broadcasted, thus is more suitable for wireless power transmission applications [3,21,22].…”

Section: Introductionmentioning

confidence: 99%

Retro-Directive Beamforming Versus Retro-Reflective Beamforming With Applications in Wireless Power Transmission

Wang¹,

Ruan²,

Lu³

2016

PIER

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Abstract-This paper studies the difference between retro-directive beamforming technique and retroreflective beamforming technique in the context of wireless power transmission applications. In all of our studies, a wireless power receiver broadcasts continuous-wave pilot signal; the wireless power transmitter receives and analyzes the pilot signal; finally, the wireless power transmitter transmits continuous-wave power with phase profile conjugate to that of the received pilot signal. Our study demonstrates that a linear equi-spaced antenna array configuration employed by the wireless power transmitter behaves as a retro-directive beamformer when the wireless power receiver resides in the far-zone of the wireless power transmitter, whereas it behaves as a retro-reflective beamformer when the wireless power receiver is not in the far-zone. This paper further investigates two types of array configurations other than linear equi-spaced array when the wireless power transmitter behaves as a retro-reflective beamformer. One is a V-shaped array, which is obtained by deforming the linear equi-spaced array to a "V" shape. The other is termed "perturbed array:" on the basis of linear equi-spaced array, all the elements' locations are perturbed randomly. It is particularly interesting to compare the equi-spaced array and perturbed array. When the wireless power receiver resides 5 or 6 wavelengths away, a 6-element equi-spaced array and a 6-element perturbed array produce the same power level at the near-zone focal point, but the maximum far-zone gain associated with the perturbed array is 1 dB lower than the equi-spaced array. All the conclusions drawn in this paper are supported by numerical results as well as experimental results.

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Section: Introductionmentioning

confidence: 99%

Retro-Directive Beamforming Versus Retro-Reflective Beamforming With Applications in Wireless Power Transmission

Wang¹,

Ruan²,

Lu³

2016

PIER

View full text Add to dashboard Cite

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“…The design of the near-field (NF) focused antenna is based on tuning the phase of the field, along the aperture of the antenna in order to obtain a locally plane wavefront at a focal point [17]. NF-focused antennas have different applications such as microwave remote sensing, and medical application [18,19]. NF-focused microstrip arrays are designed for gate-access control and industrial heating [20,21].…”

Section: Introductionmentioning

confidence: 99%

Different Designs of Dual-Focus Perforated Transmitarray Antenna in Near/Far-Field Region

Malhat¹,

Hassan

2016

AEM

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In this paper, the design of single-focused and dual-focused transmitarray antennas in the near-field (NF) or/and far-field (FF) applications are proposed. A unit-cell element consists of a dielectric square box with four identical holes is used. The phase compensation of the unit-cell elements depends on changing the hole radii according to the position of the unit-cell element, the feeding horn, and the beam direction. The radiation characteristics of 13×13 unit-cell elements transmitarray antenna focused in the near-and the far-field regions are investigated. A single structure, dual-focused transmitarray is designed using a chess-board arrangement of the unit-cell elements. Double-focused transmitarray antennas for FF/FF, FF/NF, and NF/NF are designed and investigated. The phase distributions and the corresponding hole radii for different configurations of the dual-focused transmitarray antennas are presented. The radiation characteristics of different array configurations are investigated and analyzed using a full-wave simulator CST Microwave Studio.

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“…This spontaneous radiation can be detected by a radiometer. This kind of devices has been widely studied [1] and used in many applications, from radioastronomy [2] to breast cancer detection [3,4] or industrial processes [5,6]. However, these devices are bulky and expensive to incorporate a large number of them as sensors in a production chain.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of a Low-Cost Radiometer for Hostile Scenarios

León

2015

PIER Letters

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Abstract-Noncontact temperature measurements in industrial scenarios present great variety of difficulties (dust, vapor. . . ). In this work, the authors study the use of a low-cost microwave power radiometer to measure the temperature of hot metal plate during its cooling with water. Two different radiometers, centred at different frequency bands, have been experimentally considered. The radiometers have been surrounded with a metal box to reduce undesirable radiation. Several experiments have been carried out, showing the ability of these radiometers to detect the cooling of the plates. A recalibration of the radiometer gain can be done to compensate the gain variation of the circuitry of the radiometers.

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A Near Field Focused Microstrip Array for a Radiometric Temperature Sensor

Cited by 142 publications

References 6 publications

Retro-Directive Beamforming Versus Retro-Reflective Beamforming With Applications in Wireless Power Transmission

Retro-Directive Beamforming Versus Retro-Reflective Beamforming With Applications in Wireless Power Transmission

Different Designs of Dual-Focus Perforated Transmitarray Antenna in Near/Far-Field Region

Experimental Study of a Low-Cost Radiometer for Hostile Scenarios

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