CPW-Fed Frequency-Reconfigurable Slot-Loop Antenna With a Tunable Matching Network Based on Ferroelectric Varactors

Li, Hsiao-Yun; Yeh, Che-Ting; Huang, Jun-Jie; Chang, Che-Wei; Yu, Chen-Tsung; Fu, Jia‐Shiang

doi:10.1109/lawp.2014.2375334

Cited by 24 publications

(18 citation statements)

References 14 publications

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“…It can also be observed that the points at the edge of the chart, which are predicted by the theory, are not obtained in the measurement. As proofed by equation (1), when the matched impedance is on or close to the outer circle, its real part should be either zero or ∞. This condition can only be satisfied if the matching network is purely reactive, which is not the case in the fabricated circuits.…”

Section: B Analysis and Discussionmentioning

confidence: 98%

“…Beside frequency agile systems, tunable MN are being used heavily for applications such as tunable/wideband antennas [1], efficiency-enhanced and load-sensitive power amplifiers (PAs) [2], [3], and range-adaptive wireless power transfer [4]. One of the main parameters the RF designer needs to know about a tunable MN, is the set of all complex impedances that can be matched to a specific load (typically 50 Ω).…”

Section: Introductionmentioning

confidence: 99%

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Analytical Formulas for the Coverage of Tunable Matching Networks for Reconfigurable Applications

Arabi

Morris

Beach

2017

IEEE Trans. Microwave Theory Techn.

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Section: B Analysis and Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Analytical Formulas for the Coverage of Tunable Matching Networks for Reconfigurable Applications

Arabi

Morris

Beach

2017

IEEE Trans. Microwave Theory Techn.

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“…Yang et al in [12] proposed a frequency tunable microstrip antenna by adding a U-slot on the patch in which matching frequency was varied by adjusting the input reactance. Li et al proposed a slot-loop varactor-loaded antenna with a tunable matching network (TMN) in [13]. Simorangkir et al proposed a frequency-reconfigurable and wearable antenna using PDMS-embedded conductive-fabric technology in [14].…”

Section: Introductionmentioning

confidence: 99%

A Novel Reconfigurable Bandpass Filtering Antenna for Iot Communication Applications

Allam¹,

Madhav²,

Anilkumar³

et al. 2019

PIER C

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This paper presents a novel reconfigurable filtering antenna with three tunable states used for IoT applications. The frequency reconfigurability is achieved using the combination of a hairpin filter and an open loop filter in the structure with the switching of p-in diodes. The open-loop filter structure provides two narrow band states at 2.4 GHz and 7.8 GHz, and the hairpin filter provides a single narrow band state at 10.4 GHz. The frequency reconfiguration is obtained without compromising the compact size of the designed circuit along with the targeted frequency bands at lower WLAN (2.47 GHz), WiMAX (3.42 GHz), INSAT C-band (7.18 GHz), fixed/mobile satellite service in X-band (8.4 GHz), direct broadcast service in Ku-band (12.14 GHz) applications. The prototype is constructed on an FR4 substrate and tested for validation in an anechoic chamber. The designed antenna provides excellent radiation characteristics and considerable gain at resonant frequencies. The proposed reconfigurable antenna is also tested using the CDAC Cmote device in the real-time environment and found more suitable for the IoT based communication applications.

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“…A key metric of interest for such antennas is 'tuneability' or frequency agility, recording the range of frequencies that can be addressed by the tuneable antenna. A survey of the contemporary literature suggests that this assessment is almost always supported by a stated range of measured tuneable input responses S 11 [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. However, this makes no assessment of the radiation efficiency offered over the tuned range, reporting of which over a tuneable range was found to be much less widespread.…”

Section: Introductionmentioning

confidence: 99%

“…However, this makes no assessment of the radiation efficiency offered over the tuned range, reporting of which over a tuneable range was found to be much less widespread. The survey found that in nearly half of cases no efficiency data were given [7,8,10,13,15,16,[18][19][20], while in others values were given but the method used to measure them was not declared [6,9,17]. Of the papers found to have reported both efficiency values and the method by which these values were obtained (only 40% of those surveyed), none were found to have attempted to distil an efficiency-based approach to recording metrics of frequency agility.…”

Section: Introductionmentioning

confidence: 99%

Efficiency‐based approach to quantifying ‘tuneability’ performance in frequency‐agile narrowband antennas

James

Hilton

Beach

2019

IET Microwaves, Antennas & Propagation

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Many communications systems require reconfigurable band access in compact form factors. Contemporary literature routinely reports ‘tuneability’ (or frequency agility) in input response terms (S11), yet repeatable efficiency data were reported in <40% of cases surveyed. Despite the low efficiencies associated with many tuneable narrowband antennas, e.g. electrically small antennas (ESAs), reference methods to quantify tuneability in terms of a tuned range of realised antenna efficiency, average efficiency in the band and integrated efficiency–bandwidth product do not exist and thus have not been widely adopted. Here, these metrics have been formulated for general application to efficiency‐based tuneability assessment of narrowband antennas. Application to a set of fixed‐frequency/varactor‐tuned ESAs (ka = 0.19–0.31) in the ultra‐high frequency band is demonstrated. Tuning range of 10% or 25% realised efficiency was found to be several times narrower than S11 < −6 dB tuning range for antennas in this study and in the literature, highlighting the need for a shift to efficiency‐based tuneability reporting in support of RF system design analysis. The integrated efficiency–bandwidth product has been demonstrated for combined efficiency and reconfigurability comparison of tuneable antennas, providing a platform for future performance grading of a diverse range of antenna tuning technologies.

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CPW-Fed Frequency-Reconfigurable Slot-Loop Antenna With a Tunable Matching Network Based on Ferroelectric Varactors

Cited by 24 publications

References 14 publications

Analytical Formulas for the Coverage of Tunable Matching Networks for Reconfigurable Applications

Analytical Formulas for the Coverage of Tunable Matching Networks for Reconfigurable Applications

A Novel Reconfigurable Bandpass Filtering Antenna for Iot Communication Applications

Efficiency‐based approach to quantifying ‘tuneability’ performance in frequency‐agile narrowband antennas

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