Tunable and dual-band rectangular slot-ring antenna

Carrasquillo-Rivera, I.; Solis, R.A.R.; Colom-Ustáriz, José G.

doi:10.1109/aps.2004.1330304

Cited by 16 publications

(8 citation statements)

References 4 publications

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“…The practical SMD components are lossy. Furthermore, various biases on a varactor have different values [12] and result in varying . The bias choke of the varactor is another factor affecting and the matching band selection performance.…”

Section: Fabrication and Measurement Of A Tunable Cross-type Networkmentioning

confidence: 99%

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Novel Cross-Type Network for Wide-Tuning-Range Reconfigurable Multiband Antennas

Lee

Tsai

Yang

2014

International Journal of Antennas and Propagation

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This paper presents a cross-type network design with a novel reconfigurable functionality to realize a tunable multiband antenna. By attaching a reconfigurable network at the feeding port of a broadband antenna, multi-input impedance adjustment enables the production of multimatching operating bands. Each band can be independently controlled by a single component with a considerably wide tuning range and high selectivity. The experiments in this study involved using an ultra-wideband (UWB) antenna connected to the proposed cross-type network. The tunable antenna operates in a dual band of (1.39 to 2.34 GHz) and (2.1 to 3.6 GHz) with tunable frequency ratios of 168% and 132%, respectively. The average bandwidths at and are approximately 50 MHz and 148 MHz, respectively, implying narrowband operation. The measured radiation pattern revealed that the tunable antenna exhibits a nearly omnidirectional radiation pattern at both 1.8 and 3.5 GHz. The network circuit architecture can be extended to the multiband function type by adopting this matching approach. The amount of shunt matches determines the number of operation bands.

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Section: Fabrication and Measurement Of A Tunable Cross-type Networkmentioning

confidence: 99%

“…Numerous studies have analyzed reconfigurable and multiband structures, such as the microstrip patch antenna [4][5][6][7], PIFA [8,9], and slot antenna [10][11][12]. Reconfigurable antennas can manipulate the current distribution of the structure and vary resonance frequencies.…”

Section: Introductionmentioning

confidence: 99%

Novel Cross-Type Network for Wide-Tuning-Range Reconfigurable Multiband Antennas

Lee

Tsai

Yang

2014

International Journal of Antennas and Propagation

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“…The radiation efficiency varies between about 80%-90% over the tuning range. Many other frequency agile antennas using varactors have been proposed including PIFAs [9][10][11], slot dipoles [12] slot rings [13], and printed bowties [14], making the varactor one of the most versatile techniques for obtaining frequency agility. A second approach to achieving continuous frequency tuning is through the use of substrate materials, such as ferrites, ferroelectrics, or liquid crystals, whose material properties can be altered by applying a static electric or magnetic field.…”

Section: A Examples Of Continuous Frequency Tuningmentioning

confidence: 99%

Frequency agile antennas for wireless communications – A survey

Petosa

2010

2010 14th International Symposium on Antenna Technology and Applied Electromagnetics &Amp; The American Electromagnetics Confer

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A review of the various methods for designing frequency agile antennas is undertaken. Examples of techniques for achieving either discrete or continuous frequency tuning are examined along with the common antenna elements being considered for wireless communications. Advantages and disadvantages of the various techniques are discussed along with current achievable performance. I. INTRODUCTIONThe proliferation of wireless communication applications and devices, and the ever-increasing demand for bandwidth will lead to saturation of the available frequency spectrum. Various methods are currently being studied and implemented to improve channel capacity (ex. MIMO, diversity schemes, cognitive radio). Many of these methods require antennas capable of wideband or multi-band operation. However, the compact nature of hand-held or portable devices puts significant physical constraints on the maximum antenna dimensions which, in turn, results in a restriction on the achievable bandwidth. By designing antennas with frequency agility, small antennas with narrow instantaneous bandwidths can be tuned to operate over a larger range of frequencies, thus effectively enhancing bandwidth performance. There is thus an emerging need for small, compact antennas with frequency agility. This paper identifies the key figures of merit for frequency agile antennas (a sub-class of reconfigurable antennas) designed for wireless communications, presents the potential antenna candidates and reviews the various proposed techniques for achieving frequency agility. Selected examples are then presented to illustrate the typical performance currently being achieved.

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“…Hong demonstrated that the resonance frequency of a slot-ring antenna can be reduced by capacitive loading [3]. Slot-ring antennas that are tunable or reconfigurable over a small frequency range have been presented using either capacitive loading [4,5] or reconfigurable matching networks [6]. This paper presents a square slot-ring antenna that tunes from 5 GHz to less than 2 GHz with capacitive loading.…”

Section: Introductionmentioning

confidence: 97%