Harmonic Suppression Characteristic of a CPW-Fed Circular Slot Antenna Using Single Slot on a Ground Conductor

Yeo, Junho; Kim, Dongho

doi:10.2528/pierl09072108

Cited by 11 publications

(8 citation statements)

References 10 publications

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“…The circular slot antenna in Figure A is an example for harmonic rejection. The multi‐frequency rejection is achieved by inscribing single slot on ground plane.…”

Section: Design Aspects Of the Antennas Suitable For Rfeh Systemmentioning

confidence: 99%

RF energy harvesting systems: An overview and design issues

Divakaran

Krishna

Nasimuddin

2018

Int J RF Microw Comput Aided Eng

137

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One of the main challenges in implementing sensor devices for internet of things (IoTs), is the means for the operating power supply. RF energy harvesting (RFEH) presents a promising solution as RF power is a suitable choice particularly for cases where solar harvesting is not feasible. However, in spite of RF communication system design being a well-established, there are several challenges poised for the implementation of the RFEH systems especially for harvesting the ambient RF signals. The challenges can be widely categorized as the overall conversion efficiency, bandwidth, and form factor. In this article, an exhaustive survey on the different RFEH system that is reported is carried out and discussed. Important design issues are identified with insights drawn. First, we have presented the challenges in designing antennas for RFEH systems. This is followed by rectifier circuits and matching networks, and eventually a general frame work for designing of ambient RFEH systems is deduced.IoT sensors, RF energy harvesting, rectennas, rectifier, matching circuit | INTRODUCTIONRecent advances in technology has led to the development of Internet of Things (IoT), Wearable Electronics, 5G Wireless Systems, etc, which requires widespread deployment of sensors often positioned at remote places 1 with the capacity of communicating wirelessly with each other. Power is often the limiting factor, as we have to depend on battery sources. This leads to the tedious task of disposing and replacing enormous number of batteries causing environmental pollution.Energy harvesting (EH) provides a green as well as sustainable solution to this challenge. This involves absorbing ambient energy and converting it into electricity to power up the battery/sensors. 2 Various sources of ambient energy are solar energy, wind energy, tidal energy, electromagnetic energy, thermal energy, mechanical energy, etc. The block diagram of a typical EH system is shown in Figure 1. An energy harvester converts the incident ambient energy into electrical energy. Power management unit (PMU) conditions the electrical energy into a form suitable for a particular application. Solar energy, even though the most abundant of the sources, suffers from intermittent supply. 3 Due to its continuous availability, radio frequency (RF) source is an alternative. However, it suffers from low incident power levels. This can be improved by using a dedicated source and an efficient RF to DC conversion circuit. Low power consumption in the sensors and a widespread availability of RF power makes it as a tangible option for energy harvesting.The RFEH process involves harvesting electrical energy from RF signals (which could be from a dedicated, ambient, or unknown RF source). The power density from the various RF sources ranges from 0.1 (ambient RF) to 1000 (dedicated RF) μW/cm 2 . The various RF energy sources are, namely, WiFi, WLAN, Digital TV, AM, FM, Bluetooth, etc. Due to its ubiquitous nature, it can be used to power wireless sensor nodes, 4 wireless body area networks, ...

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“…The circular slot antenna in Figure A is an example for harmonic rejection. The multi‐frequency rejection is achieved by inscribing single slot on ground plane.…”

Section: Design Aspects Of the Antennas Suitable For Rfeh Systemmentioning

confidence: 99%

RF energy harvesting systems: An overview and design issues

Divakaran

Krishna

Nasimuddin

2018

Int J RF Microw Comput Aided Eng

137

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“…An elongated slit parallel to or perpendicular to the slot element can restrict the harmonic energy to couple into the antenna element. In that case, the slit length should be about half a wavelength of the second harmonic to achieve the band‐rejected resonance . However, because of the parallel slit having to be much close to the slot element, the high manufacture accuracy is required.…”

Section: Structure Considerationsmentioning

confidence: 99%

A wideband printed slot antenna with harmonic suppression

Qin

Chen

et al. 2018

Micro & Optical Tech Letters

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A wideband slot antenna with harmonic suppression is proposed to utilize the environment microwave energy. The antenna element is a printed narrow slot with an offset microstrip‐feed line to widen the operating band by generating the double resonance of similar frequencies. By adding a rectangular notch in the middle of slot element and grounding the microstrip terminal, its second‐order and third‐order harmonics are effectively suppressed. The experimental results of the prototype antenna show that the fractional bandwidth of its fundamental mode can reach 37.4%, while the antenna efficiencies of the second and third harmonics both are less than 23%. In the operating band the prototype antenna has the approximately omnidirectional radiation characteristic. This antenna structure also provides relaxed fabrication tolerances.

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“…The rapid increase in demand for telecommunications capabilities in recent years has produced a rapid growth in the number of mobile systems, such as DCS, IMT-2000, SDAR, WLANs, LTE and Hiper-LAN with the operating bands of these technologies distributed at 1.8 GHz, 2.1 GHz, 2.4 GHz, 2.6 GHz, 5.2 GHz and 5.8 GHz, respectively. The CPW-fed circular or rectangular slot antenna with circular polarization has been widely used in practical designs [1][2][3][4][5][6][7][8][9][10][11][12][13]. Various techniques for improving the circular polarization bandwidth have been proposed, such as by embedding an arc slot beside the spiral slots, varying the turn number of the spiral slots, and changing the separation between the arc slot and the spiral slots [14].…”

Section: Introductionmentioning

confidence: 99%

A Dual-Band CPW-Fed L-Slot Antenna With Both Linear and Circular Polarizations

Wang¹,

Lee²,

Lee³

2011

PIER C

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A design procedure for a dual-band CPW-fed linearly and circularly polarized (CP) antenna based on the L-shaped slot antenna is presented in this paper. The slot antenna and the feeding structure are fabricated on the same plane of the substrate so that circuit processes and position alignment can be simplified. By shortening the length of one arm of the L-slot, an additional mode with two orthogonal electrical fields with a phase difference of 90 degree is excited, so that the circularly polarized wave can also be excited. The enhancement of the resonant bandwidth is achieved by utilizing a stub-protruded feedline, adding one finger slit at the other arm slot, and tuning the dimension of the ground plane. A bandwidth of 22.0% (2.23-2.78 GHz) is achieved with an axial ratio < 3 dB for the optimized case.

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Harmonic Suppression Characteristic of a CPW-Fed Circular Slot Antenna Using Single Slot on a Ground Conductor

Cited by 11 publications

References 10 publications

RF energy harvesting systems: An overview and design issues

RF energy harvesting systems: An overview and design issues

A wideband printed slot antenna with harmonic suppression

A Dual-Band CPW-Fed L-Slot Antenna With Both Linear and Circular Polarizations

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