Multiband Reconfigurable Filtering Monopole Antenna for Cognitive Radio Applications

Kingsly, Saffrine; Thangarasu, Deepa; Kanagasabai, Malathi; Alsath, M. Gulam Nabi; Rao, T. Rama; Palaniswamy, Sandeep Kumar; Sambandam, Padmathilagam

doi:10.1109/lawp.2018.2848702

Cited by 55 publications

(37 citation statements)

References 19 publications

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“…The salient features of the proposed multi‐band reconfigurable filtering antenna are: The unique feature of the proposed work is that it is one of the fewest available reconfigurable filtering antennas in the literature whose frequency of operation extends to entire UWB and it stands out for its miniaturized size unlike Reference . The filtering antenna proposed can operate simultaneously at three different application bands simultaneously thereby making it more suitable in a cognitive environment unlike References 3‐6 and 9‐15. Reduced numbers of actuators are used unlike Reference . Discrete switching is made plausible using PIN diodes. The integration of reconfigurable filter with the UWB antenna inhibits the interference of primary user into the secondary user through harmonic suppressions, making it a suitable prospect for the class of smart antennas. The proposed antenna renders stable radiation pattern and passable gain unlike References and , respectively. …”

Section: Resultsmentioning

confidence: 99%

“…Another method to suppress higher order harmonics by retaining the footprint of the design is presented in Reference . From the literature, it is inferred that adding a filter consisting of a C‐shaped resonator, inverted pulse shaped resonator, meandered loop resonator, and open‐circuited stub to the excitation line reduces the harmonics and improves interference rejection performance without affecting the radiation performance of the antenna . There are many papers in filtering antenna wherein varactor diode is continuously used to tune different frequencies.…”

Section: Introductionmentioning

confidence: 99%

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Reconfigurable bow tie‐based filtering antenna for cognitive radio applications

Potti¹,

Balaji²,

Alsath³

et al. 2020

Int J RF Microw Comput Aided Eng

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This article presents the design and implementation of an 88 × 85 mm reconfigurable filtering bow‐tie antenna with four operating states. Two PIN diodes are deployed to reconfigure the transmission zeros to realize ultra‐wide band (UWB), 3.5/5.5 GHz with independent switching. This switching prevents the interference of the primary user into the secondary user thereby making the filtenna suitable for cognitive radio applications. The proposed filtenna consists of a UWB bow‐tie antenna integrated with a band‐pass filter with reconfigurable property enabled using two PIN diodes. The prototype‐filtering antenna is fabricated and the simulated results are validated using measurements. The presented results show that the antenna exhibits good impedance and radiation characteristics.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reconfigurable bow tie‐based filtering antenna for cognitive radio applications

Potti¹,

Balaji²,

Alsath³

et al. 2020

Int J RF Microw Comput Aided Eng

Self Cite

View full text Add to dashboard Cite

show abstract

“…The literature contains a number of designs for antennas that can be reconfigured between UWB/wideband and narrowband performance. However, most of those designs [6][7][8][9][10][11][12] provide an omni-directional radiation pattern within both modes of operation. The geometry of many of the designs is complex [7], [8], [11].…”

Section: Introductionmentioning

confidence: 99%

“…However, most of those designs [6][7][8][9][10][11][12] provide an omni-directional radiation pattern within both modes of operation. The geometry of many of the designs is complex [7], [8], [11]. For this reason, as well as due to a lack of design rules, it would be both difficult and time-consuming to redesign those antennas to cover a different set of operating frequency bands.…”

Section: Introductionmentioning

confidence: 99%

“…For this reason, as well as due to a lack of design rules, it would be both difficult and time-consuming to redesign those antennas to cover a different set of operating frequency bands. A number of the antennas rely on the use of an external filter which is integrated into the feedline [8][9][10][11]. Unfortunately, the use of an external filter increases the size of the antenna.…”

Section: Introductionmentioning

confidence: 99%

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Liquid Metal Bandwidth-Reconfigurable Antenna

Alqurashi

Kelly

Wang

et al. 2020

Antennas Wirel. Propag. Lett.

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This paper shows how slugs of liquid metal can be used to connect/disconnect large areas of metalisation and achieve radiation performance not possible by using conventional switches. The proposed antenna can switch its operating bandwidth between ultra-wideband and narrowband by connecting/disconnecting the ground plane for the feedline from that of the radiator. This could be achieved by using conventional semiconductor switches. However, such switches provide point-like contacts. Consequently, there are gaps in electrical contact between the switches. Surface currents, flowing around these gaps, lead to significant back radiation. In this paper, slugs of liquid metal are used to completely fill the gaps. This significantly reduces the back radiation, increases the boresight gain, and produces a pattern identical to that of a conventional microstrip patch antenna. Specifically, the realised gain and total efficiency are increased by 2 dBi and 24%, respectively. The antenna has potential applications in wireless systems employing Cognitive Radio and Spectrum Aggregation.

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Filtennas for wireless application: A review

Mishra

Lalitha

2019

Int J RF Microw Comput Aided Eng

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In recent year, various filtenna circuits have been developed satisfying the objectives and prerequisites of wireless communication. Some of these developed designs are new or some are the improved version of previous works whereas the others are the combination of conventional methods. This article presents the review of filtenna circuits starting from the beginning to the improvements until date. This article starts with brief overview of various filters with their design strategies and ends in its implementation in filtenna designs followed by discussion on several filtenna designs in term of size and overall performances. Among various designs, bandpass, and bandstop filters are extensively used in filtenna realization as it provides a better selectivity in desired band. Various planar filtenna circuits, based on either defected ground structure (DGS) or resonator or SIW filters are reviewed and presented. Besides, planar filtennas, these filters are also integrated to the aperture of horn antennas for the realization of horn filtennas, applicable for high frequency operations. It is observed that SIW based filtennas exhibited narrow impedance bandwidth. This feature can be improved by doubling substrate layer as well as the number of metallic ways. Whereas, resonator based filtennas use resonator based filters along with DGSs to enhance impedance bandwidth as well as minimize mutual coupling and cross‐polar radiation. Apart from single element filtenna, filtenna arrays, and reconfigurable filtennas (including planar and horn reconfigurable filtennas) are presented. This review article may be helpful for beginners working on filtenna circuits and also such a review process is not available in the open literature to the best of author's knowledge.

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Multiband Reconfigurable Filtering Monopole Antenna for Cognitive Radio Applications

Cited by 55 publications

References 19 publications

Reconfigurable bow tie‐based filtering antenna for cognitive radio applications

Reconfigurable bow tie‐based filtering antenna for cognitive radio applications

Liquid Metal Bandwidth-Reconfigurable Antenna

Filtennas for wireless application: A review

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