Slot antenna with parasitic element for dual band operation

Morioka, Toshihiro; Araki, Shoko; Hirasawa, Kazuhiro

doi:10.1049/el:19971373

Cited by 28 publications

(22 citation statements)

References 2 publications

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“…Other topologies have also been used to achieve dual/multiband operations. Examples of these include structures that make use of parasitic elements and multiple radiating elements as described in [8] and [9]. Among other categories, design of a wideband/dualband relatively wide slot antenna fed by a microstrip line can be mentioned.…”

Section: Introductionmentioning

confidence: 99%

A Varactor-Tuned Dual-Band Slot Antenna

Behdad

Sarabandi

2006

IEEE Trans. Antennas Propagat.

249

123

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Abstract-A new technique for designing dual-band reconfigurable slot antennas is introduced. The technique is based on loading a slot antenna with a lumped capacitor (or varactor) at a certain location along the slot. Given a fixed capacitor location along the slot, decreasing the capacitance results in increasing the first and second resonant frequencies of the slot antenna. However, the changes in the resonant frequencies are significantly different for the first and second resonances and, hence, a dual-band antenna with considerable frequency ratio tuning range can be obtained. Based on this technique, an electronically tunable dual-band antenna with a frequency ratio in the range of 1.2-1.65 is designed and fabricated using a single varactor with a capacitance range of 0.5-2.2 pF. The antenna has similar radiation patterns with low cross-polarization levels at both bands and across the entire tunable frequency range.Index Terms-Multifrequency antennas, multiple band antennas, reconfigurable antennas, slot antennas.

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Section: Introductionmentioning

confidence: 99%

A Varactor-Tuned Dual-Band Slot Antenna

Behdad

Sarabandi

2006

IEEE Trans. Antennas Propagat.

249

123

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“…The slot antenna fed by the microstrip line is one type of microstrip antenna which has advantages such as low profile, lightweight, simple structure and easy fabrication [1]. For WLAN systems, some slot antennas have been proposed by using a slot-ring antenna with a narrow rectangular slot [2], parasitic element [3], or stair-shaped slot antenna [4]. However, these slot antennas mentioned above have larger dimension and are not good candidates for WLAN applications that require miniaturized antennas.…”

Section: Introductionmentioning

confidence: 99%

Design of a Novel Microstrip-Fed Dual-Band Slot Antenna for Wlan Applications

Gai¹,

Jiao²,

Yang³

et al. 2010

PIER Letters

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Abstract-In this paper, a novel dual-band rectangular slot antenna for wireless local area network (WLAN) applications in IEEE 802.11b/g/a systems is presented. The proposed antenna, fed by a 50 Ω microstrip line, has size of 32 mm × 28 mm × 1.6 mm. By introducing a pair of U-shaped strips, the proposed antenna can generate two separate impedance bandwidths. The prototype of the proposed antenna has been successfully constructed and tested. The low-band resonant frequency is located at about 2.4 GHz, with −10 dB impedance bandwidth from about 2.3 to 2.5 GHz. The highband resonant frequency is located at about 5.7 GHz, with −10 dB impedance bandwidth from about 4.9 to 6.0 GHz. In addition, the measured results show good radiation characteristics at the two operating bands, proving the dual-band operation of the proposed antenna.

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“…Other topologies have also been used to achieve dual-or multiband operations. Examples of these include structures that make use of parasitic elements [7], multiple radiating elements [8], or create fictitious resonant modes [9]. These approaches, however, can only be used to design antennas that have fixed dual-or multiband characteristics.…”

Section: Introductionmentioning

confidence: 99%

Dual-Band Reconfigurable Antenna With a Very Wide Tunability Range

Behdad

Sarabandi

2006

IEEE Trans. Antennas Propagat.

314

149

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Abstract-A new technique for designing dual-band reconfigurable slot antennas is presented. Dual-frequency operation is achieved by loading a slot antenna with two lumped variable capacitors (varactors) placed in proper locations along the slot. Loading the slot antenna with lumped capacitors shifts down the resonant frequencies of the first and second resonances of the antenna. However, these frequency shifts depend not only on the values of the capacitors, but also on their locations along the slot antenna. Here, it is shown that by choosing the locations of the varactors appropriately, it is possible to obtain a dual-band antenna whose first and second resonant frequencies can be controlled individually. In other words, the frequency of either the first or the second band can be fixed, while the other one is electronically tuned. Using such a design, an electronically tunable dual-band antenna is designed and fabricated using two identical varactors having a capacitance range of 0.5-2.25 pF. The antenna is shown to have a frequency ratio ( = 2 1 ) ranging from 1.3 to 2.67.An important feature of this antenna is its consistent radiation pattern, polarization, and polarization purity at both bands and across its entire tunable frequency range.Index Terms-Multifrequency antennas, multiple band antennas, reconfigurable antennas, slot antennas.

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Slot antenna with parasitic element for dual band operation

Cited by 28 publications

References 2 publications

A Varactor-Tuned Dual-Band Slot Antenna

A Varactor-Tuned Dual-Band Slot Antenna

Design of a Novel Microstrip-Fed Dual-Band Slot Antenna for Wlan Applications

Dual-Band Reconfigurable Antenna With a Very Wide Tunability Range

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