Broadband Active Receiving Patch With Resistive Equalization

Segovia-Vargas, D.; Castro-Galan, D.; Garcia-Munoz, L. E.; González-Posadas, V.

doi:10.1109/tmtt.2007.912008

Cited by 24 publications

(6 citation statements)

References 14 publications

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“…The integration of the antenna and the active components drastically reduce the system volume, system weight, and complexity of the matching network. In the last decade, active antennas are employed in wireless and in medical communication systems [25][26][27][28][29][30][31]. The major applications of active antennas are electronically scanning arrays and phased arrays.…”

Section: Active Wearable Body Area Network and Antennasmentioning

confidence: 99%

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Active Compact Wearable Body Area Networks for Wireless Communication, Medical and IoT Applications

Sabban

2018

ASI

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The development of compact wearable antennas and transceivers for communication, IoT (Internet of Things), and biomedical systems will be presented in this paper. Development of Compact efficient wearable antennas is one of the major challenges in development of wearable communication, IoT, and medical systems. The main goal of wireless body area networks (BANs), WBANs, is to provide continuously medical data to the physician. Body area network (BAN) antennas should be flexible, lightweight, compact, and have low production cost. However, low efficiency is the major disadvantage of small printed antennas. Microstrip antennas resonant frequency is altered, due to environment conditions, different antenna locations, and different system operation modes. These disadvantages may be solved by using compact active and tunable antennas. A new class of wideband active wearable antennas for medical applications is presented in this paper. Amplifiers may be connected to the wearable antenna feed line to increase the system dynamic range. Small lightweight batteries supply the bias voltage to the active components. An active dual polarized antenna is presented in this paper. The active dual polarized antenna gain is 14 ± 3 dB for frequencies ranging from 380 to 600 MHz. The active transmitting dual polarized antenna output power is around 18 dBm. A voltage-controlled diode, varactor, may be used to control the antenna electrical performance at different environments. For example, an antenna located in patient stomach area has VSWR (Voltage Standing Wave Ratio) better than 2:1 at 434 MHz. However, if the antenna will be placed on the patient back, it may resonate at 420 MHz. By varying the varactor bias voltage, the antenna resonant frequency may be shifted from 420 to 434 MHz. An ultra-wideband passive and active printed slot antenna may be employed in wideband wearable communication systems. The active slot antenna gain is 13 ± 2 dB for frequencies from 800 MHz to 3 GHz.

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Section: Active Wearable Body Area Network and Antennasmentioning

confidence: 99%

“…However, small printed antennas suffer from low efficiency [24]. Active antennas for communication systems are presented in journals, as referred to in [25][26][27][28][29][30][31]. Novel active and tunable wearable antennas for BAN applications is presented in this paper.…”

Section: Introductionmentioning

confidence: 99%

Active Compact Wearable Body Area Networks for Wireless Communication, Medical and IoT Applications

Sabban

2018

ASI

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“…A known reference antenna is used as a transmitter Tx while the antenna under test is located for receiving at θ = -90º, Φ = 180º, that is, in a direction parallel to the semiloop ground plane. This test-site resulted in an effective gain (see [20] and [21]) of the NIC-loaded antenna, GNIC-loaded, of −6.88 dB. From this figure it can be inferred that the radiation efficiency (ηrad) for the loaded case is 10.91%, calculated from the relation G = ηrad•Dmax, where Dmax is 2.7 dBi and corresponds with the simulated value for the loaded semiloop structure in the direction of interest, taking into account the changes in the directivity for this case, as aforementioned and depicted in Fig.…”

Section: Design Examplementioning

confidence: 99%

Design Method for Actively Matched Antennas With Non-Foster Elements

Albarracin-Vargas

González-Posadas

Herráiz-Martínez

et al. 2016

IEEE Trans. Antennas Propagat.

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The design of electrically small antennas loaded with active non-Foster elements is a topic whose interest has grown in the last years. In this paper, a new strategy for the design of actively matched antennas loaded with non-Foster elements is presented. The analysis of different parameters, such as the sensitivity to non-Foster circuit placement, the overall antenna system stability and current distributions, has to be considered in order to enhance the antenna performance. A design example using an electrically small antenna (ESA) and its realization is presented to validate the proposed strategy.

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“…A wireless device with thermal-aware protocol is presented in [30]. Wearable sensors and antennas for healthcare and RF systems are presented in [31][32][33][34][35][36][37][38][39][40][41]. Dual-polarized wearable antennas for healthcare applications are presented in [41].…”

Section: Introductionmentioning

confidence: 99%

Green Wearable Sensors for Medical, Energy Harvesting, Communication, and IoT Systems

Sabban¹

2023

Advances in Green Electronics Technologies in 2023

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This chapter presents novel passive and active wearable sensors for biomedical systems, energy harvesting, and communication devices. Design tradeoffs, simulation, and measured results of compact efficient sensors for communication, energy harvesting, IoT, and healthcare systems are discussed in this chapter. The new sensors are green sensors with an energy harvesting unit. The sensor electrical parameters near the human body were evaluated by employing RF CAD software. The sensors are flexible passive and active devices with high efficiency and low cost. Low-cost sensor may be developed by printing the printed antenna with the antenna feed network and the active components on the same board. Efficient metamaterial sensors were developed to improve the system electrical performance. The resonant frequency range of the sensors, with Circular Split-Ring Resonators CSRRs, is lower by 5% to 11% than the sensors with CSRRs. The directivity and gain of the sensors with CSRRs are higher by 2.5dB than the sensors without CSRRs. For S11 lower than –6 dB, the bandwidth of the novel metamaterial sensors may be around 15 to 55%. The directivity and gain of the new metamaterial sensors are around 5 dBi to 7.5 dBi. The receiving active sensor gain is 12 ± 3 dB. The transmitting active sensor gain is 13 ± 3 dB.

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Broadband Active Receiving Patch With Resistive Equalization

Cited by 24 publications

References 14 publications

Active Compact Wearable Body Area Networks for Wireless Communication, Medical and IoT Applications

Active Compact Wearable Body Area Networks for Wireless Communication, Medical and IoT Applications

Design Method for Actively Matched Antennas With Non-Foster Elements

Green Wearable Sensors for Medical, Energy Harvesting, Communication, and IoT Systems

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