Band-Reconfigurable Monopole Antenna for Cognitive Radio Applications

Koley, Santasri; Bepari, Dipen; Mitra, Debasis

doi:10.1080/03772063.2015.1024179

Cited by 8 publications

(4 citation statements)

References 9 publications

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“…Varactor diode that is also used for reconfigurable characteristics provides tuning from wideband to narrowband applications. Also, by placing ideal switches on stepped impedance resonator (SIR) leads to UWB/dual notch/multiband applications . T‐F shaped stubs, two stage T‐shaped SIR resonator or band stop performance (WLAN/ITS/ITU) is also obtained by means RF PIN diodes .…”

Section: Introductionmentioning

confidence: 99%

Compact multiband planar monopole antenna for Bluetooth, LTE, and reconfigurable UWB applications including X‐band and Ku‐band wireless communications

Sharma

Awasthi

Singh

2019

Int J RF Microw Comput Aided Eng

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In this article, a small-printed Bluetooth/LTE/UWB/X-band/Ku-band monopole antenna with high rejection triple band-notch is presented. Notched bands include WiMAX (IEEE802.16 3.30-3.80 GHz), WLAN IEEE802.11a/h/j/n (5. , and downlink satellite system (7.1-7.9 GHz). By including inverted T-shaped stub and etching two C-shaped slots on the radiating patch, triple band-notch function is obtained with measured high band rejection (VSWR = 14.59 at 3.69 GHz, VSWR = 39.40 at 5.42 GHz, and VSWR = 6.43 at 7.57 GHz) and covers a UWB useable fractional bandwidth of 157.75% (2.285-19.35 GHz = 17.065 GHz). Reconfigurable characteristics are obtained using PIN diodes, which control the individual notched bands. Proposed antenna is printed on Rogers RT/duroid5880 substrate with compact dimensions of 20 × 22 mm 2 . Proposed antenna finds its applications for Bluetooth, LTE, UWB, other multiple wireless applications for close range radar (8-12 GHz) in X-band, and satellite communication in Ku-Band with omnidirectional pattern in H-plane. K E Y W O R D S downlink satellite system, fractional bandwidth, long-term evolution-LTE, omnidirectional, reconfigurable, triple notch, WiMAX, WLAN

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Section: Introductionmentioning

confidence: 99%

Compact multiband planar monopole antenna for Bluetooth, LTE, and reconfigurable UWB applications including X‐band and Ku‐band wireless communications

Sharma

Awasthi

Singh

2019

Int J RF Microw Comput Aided Eng

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“…In [15], an optically controlled reconfigurable planar monopole antenna was presented to operate at UWB and three narrow bands by controlling four photoconductive switches. Single-port frequencytunable filter antennas for cognitive radios were proposed in [16][17][18][19][20][21][22]. To obtain a narrowband operation, a defected microstrip structure (DMS) bandpass filter was embedded in the feed line of an UWB antenna.…”

Section: Introductionmentioning

confidence: 99%

“…In [21], a reconfigurable filter was incorporated into the ground plane of the antenna. In [22], a band reconfigurable monopole antenna was designed in the range of 2.2-6 GHz. Most of these antennas [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] are designed for operation above 2 GHz.…”

Section: Introductionmentioning

confidence: 99%

Hesitant fuzzy pairwise comparison for software cost estimation: a case study in Turkey

Başar¹

2017

Turk J Elec Eng & Comp Sci

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Estimating the cost of software is a complex process for almost all engineering companies. Uncertainties about development method, design, estimation process, data, and processing affect the accuracy of estimation. Underestimation results in fewer resources being committed than the project really needs, an unrealistic schedule, and low quality outputs.On the other hand, overestimation wastes resources and causes loss of customer credit. Thus, choosing the appropriate cost estimation method is crucial. Studies in the literature emphasize the importance of empirical, analytical methods and expert judgement. Certain cost estimation techniques have been widely studied in the literature. However, there are limited studies using fuzzy approaches for software cost estimation. This paper presents a hesitant fuzzy pairwise comparison (HFPC) used in the hesitant fuzzy analytic hierarchy process for software cost estimation problems by using expert judgement. For this purpose, first a number of criteria are selected with the help of expert judgements from the Turkish banking sector and information technology industry. Subsequently, the HFPC method is presented to estimate the cost of software projects. In order to analyze the efficiency of the proposed approach, it is applied to a software cost estimation problem for a Turkish company. It is seen that the proposed method provides efficient estimations due to low deviation between the real effort and estimated cost. The results are also approved by experts working in the relevant software company.

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“…Frequency reconfigurable antenna is desirable as opposed to multiple use of single band antennas which increase the space consumption, fabrication cost, and circuit complexity . Generally frequency reconfigurability is obtained by inserting active switches to the antenna radiating elements , antenna feeding network , multiple ports to generate narrowband frequencies , and Split ring resonators . However the frequency reconfigurability method in the conventional antenna design does not improve the performance of the antenna in terms of gain and radiation pattern characteristics.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable antenna using capacitive loading to Artificial Magnetic Conductor (AMC)

Dewan

Rahim

Hamid

et al. 2016

Micro & Optical Tech Letters

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A dual band Artificial Magnetic Conductor (AMC) with capacitive tuning of reflection phase at lower band frequency is proposed. The AMC operates at upper band of fixed frequency at 5.8 GHz while the lower band reconfigurable frequency is from 2.5 GHz up to 3.1 GHz. The simulated reconfigurable frequencies are 2.5, 2.62, and 3.10 GHz. The corresponding resonance structure for each band is circular patch and circular slotted ring with single capacitor per AMC unit cell. Subsequently, the AMC is incorporated with conventional UWB antenna. The effects of AMC capacitive tuning to UWB antenna performance are studied in terms of frequency reconfigurability, gain, and radiation patterns. Measurement is also carried out for the reflection coefficient and radiation patterns. Parametrical studies of the antenna such as the misalignment between the top and bottom substrate layers, air gap between the substrate layers, and capacitance tolerance of the capacitor to the reflection coefficients are also discussed. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2422–2429, 2016

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Band-Reconfigurable Monopole Antenna for Cognitive Radio Applications

Cited by 8 publications

References 9 publications

Compact multiband planar monopole antenna for Bluetooth, LTE, and reconfigurable UWB applications including X‐band and Ku‐band wireless communications

Compact multiband planar monopole antenna for Bluetooth, LTE, and reconfigurable UWB applications including X‐band and Ku‐band wireless communications

Hesitant fuzzy pairwise comparison for software cost estimation: a case study in Turkey

Reconfigurable antenna using capacitive loading to Artificial Magnetic Conductor (AMC)

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