Reconfigurable front-end antennas for cognitive radio applications

Tawk, Y.; Bkassiny, Mario; El-Howayek, Georges; Jayaweera, Sudharman K.; Avery, Keith; Christodoulou, C.G.

doi:10.1049/iet-map.2010.0358

Cited by 71 publications

(46 citation statements)

References 27 publications

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“…According to the very First CR standard IEEE 802.22 for Wireless Regional Area Network, sensing and database access are the two prime requirements [11][12]. An antenna should work in UWB and narrowband modes for spectrum sensing and to access the data respectively [13][14][15][16]. The current relevance of the antenna design for these developing technologies is to cover different wireless applications.…”

Section: Introductionmentioning

confidence: 99%

Modeling of a PIN Diode RF Switch for Re configurable Antenna Application

2018

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The paper proffers the procedure to model a PIN diode RF switch using full-wave EM solver, HFSS and utilizes the switch to built a simple partial ground plane antenna with omnidirectional radiation pattern. The proposed antenna has ability to tune it from ultra-wideband to narrowband mode. The frequency reconfigurability is accomplished by incorporating a rectangular slot resonator and a PIN diode RF switch embedded in the partial ground plane. The antenna demonstrates -10 dB impedance bandwidth from 500 MHz to 6 GHz in the ultra-wideband mode and 1.125 GHz to 2 GHz in the narrowband mode. A parasitic is stacked in the ground plane to improve the impedance matching and a rectangular slot is fused to explore the bandwidth-limiting possibility of the antenna. The optimization of the antenna is done by full-wave EM solver, HFSS and Specific Absorption Rate (SAR) of the antenna is examined using the equivalent flat tissue phantom. A prototype of the proposed antenna is fabricated and execution is accepted by measured results. The proposed antenna has simple and miniature structure, low SAR (0.41 W/Kg), omnidirectional pattern and low cross-polarization (<-15dB in E-plane and <-30dB in H-plane).

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Section: Introductionmentioning

confidence: 99%

Modeling of a PIN Diode RF Switch for Re configurable Antenna Application

2018

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“…On the other hand, it is generally recognized that the spectrum is idle for 90% of the time [1][2][3]. The under utilization of the frequency spectrum has been inspiring the use of Reconfigurable Radio concepts, such as Cognitive Radio (CR).…”

Section: Introductionmentioning

confidence: 99%

“…The proposed antenna reduces the number of antennas for CR because spectrum sensing and frequency reconfiguration are achieved in a single design. So the proposed hybrid antenna has a compact design which is well suitable for CR application [1,2] to use spectrum efficiently. This paper is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

A Wide Spectrum Sensing and Frequency Reconfigurable Antenna for Cognitive Radio

Sharma¹

2016

PIER C

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Abstract-A novel hybrid antenna capable of both spectrum sensing and frequency reconfigurability is proposed in this paper. The proposed hybrid antenna senses spectrum over a wide frequency range from 1 GHz-12 GHz and accordingly reconfigures its operating frequency in any of the four different frequencies, i.e., 2.1 GHz, 2.96 GHz, 3.5 GHz and 5 GHz. Since wideband response for spectrum sensing and each frequency state works independently, there is no interference among various signals. The wideband response for spectrum sensing is obtained by exciting semicircular arc having staircase-shaped slot in the ground plane. Frequency reconfiguration is achieved by electronic switching among various matching stubs. Both simulated and experimental results for the return loss, gain and radiation patterns are presented. The proposed hybrid antenna shows a measured return loss better than −20 dB in all the operating bands, a bidirectional radiation pattern and 4.8 dB gain in θ = 20 • and 120 • in E plane.

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“…There are three major CR network paradigms (that consider various degrees of interaction between primary and secondary users) have been identified: interweave, underlay and overlay [1]. In interweave systems, the secondary users detect the absence of primary user signals in space, time, or frequency and opportunistically communicate during these absences [2,3]. In the underlay approach, secondary users should operate below the noise floor of primary users, and thus strict constraints are imposed on their transmission power (should be less than −42 dBm/MHz).…”

Section: Introductionmentioning

confidence: 99%

Tunable Band-Notched CPW-Fed Uwb Monopole Antenna Using Capacitively Loaded Microstrip Resonator for Cognitive Radio Applications

Atallah¹,

Abdel‐Rahman²,

Yoshitomi³

et al. 2016

PIER C

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Abstract-In this paper, a new compact coplanar waveguide (CPW) ultrawideband (UWB) antenna with an electronically tunable notched band is proposed for an overlay onto cognitive radio (CR) systems. The proposed antenna utilized a rectangular microstrip resonator in the bottom layer to create a single notched band and to realize tunability and miniaturization using varactors. The center frequency of the notched band can be electronically tuned by changing the effective electrical length of the microstrip resonator, which is achieved by employing two varactor diodes at the resonator edges. Moreover, the simple biasing of the varactor diodes has a small effect on the antenna performance. Experimental results show that the proposed antenna can selectively have a band notch over a continuous operating band about 1.44 GHz from 4.77 to 6.21 GHz to prevent the interference to the primary users that are operating in this band such as the WLAN (5.15-5.35 GHz; 5.725-5.825 GHz) and the WiMAX (5.25-5.825 GHz). Good agreement is found between the simulated and the measured data.

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Reconfigurable front-end antennas for cognitive radio applications

Cited by 71 publications

References 27 publications

Modeling of a PIN Diode RF Switch for Re configurable Antenna Application

Modeling of a PIN Diode RF Switch for Re configurable Antenna Application

A Wide Spectrum Sensing and Frequency Reconfigurable Antenna for Cognitive Radio

Tunable Band-Notched CPW-Fed Uwb Monopole Antenna Using Capacitively Loaded Microstrip Resonator for Cognitive Radio Applications

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