Reconfigurable antennas for portable wireless devices

Aberle, J.T.; Oh, Seok-Jin; Auckland, D.T.; Rogers, S.D.

doi:10.1109/map.2003.1282191

Cited by 129 publications

(52 citation statements)

References 3 publications

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“…Nevertheless, the resulting miniaturisation is not always sufficient for the lower frequency bands. Bandwidth can be improved through the introduction of lossy elements, but this has an impact on efficiency, alternatively one may look to tunable or reconfigurable antennas [3][4][5][6][7], as well as dual and multi-band antennas [8]. Tuneable antennas offer several real advantages in terms of potential frequency agility, bandwidth expansion, and polarization diversity [9].…”

Section: Introductionmentioning

confidence: 99%

A capacitively loaded antenna for use in mobile handsets

Elfergani

Abd‐Alhameed

See

et al. 2010

2010 Loughborough Antennas &Amp; Propagation Conference

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Abstract-A tuneable slotted patch antenna design is presented and verified for use in the DCS, PCS and UMTS bands. The tuning circuit consists of two varactor diodes, with some passive components, and is integrated fully with the radiator patch, with the varactors occupying different locations over the slot. The tuning does not require any further modification to the patch or feed geometry. Good agreement is observed between the predicted and observed impedance bandwidth, return loss, gain and radiation pattern, throughout the range 1.70 GHz -2.05 GHz.

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Section: Introductionmentioning

confidence: 99%

A capacitively loaded antenna for use in mobile handsets

Elfergani

Abd‐Alhameed

See

et al. 2010

2010 Loughborough Antennas &Amp; Propagation Conference

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“…Reconfigurable antennas with frequency adjustability, radiation pattern selectivity, and polarization diversity are good candidates for these applications [1,2]. Reconfigurable antennas are also the components of front-ends for cognitive radio systems [3].…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable Patch Antennas With Four-Polarization States Agility Using Dual Feed Ports

Yang¹,

Gong²,

Tan³

et al. 2013

PIER B

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Abstract-Polarization reconfigurable patch antennas which can switch polarization states among vertical and horizontal linear polarization (LP), left-and right-hand circular polarization (CP) is demonstrated in this paper. The original orthogonal linear polarized antenna is a square patch fed by two ports at the adjacent edges. CP operations can be activated by introducing perturbations at the opposite corners of the patch. If a diode is loaded on every perturbed corner, the antenna polarization states can be alternated by controlling the bias voltage of two PIN diodes. Perturbation elements can be cut on the patch or on the ground. Two antenna prototypes are suggested, simulated, and verified by experiments. These polarization reconfigurable antennas have good antenna performances of low reflection coefficient, axial ratio, and cross-polarization (X-pol), and high isolation between two LP operations. They have concise structure with only two PIN diodes being required. The two reconfigurable antennas are low cost and can be integrated easily in wireless communication systems.

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“…Komulainen tennas that have a reconfigurable operating frequency together with frequency-invariant radiation characteristics will have clear technical benefits. Whilst this kind of antenna will not cover all the frequency bands simultaneously, it may provide several dynamically selectable narrow frequency bands and, within these bands, exhibit higher efficiency than is achievable with conventional antenna solutions [3]. This approach may be used to downsize the antennas whilst maintaining the operating bandwidth or, alternatively, to increase the bandwidth of the antenna without increasing the physical size.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the antenna tuning can be used to compensate for proximity effects that occur when the operating frequencies of handset antennas are detuned by the proximity of the user or by changes in the operating environment, such as occur when opening and closing a clamshell or a swivel-type mobile phone [1], [4]. In a wider context, frequency-tunable antennas are used in space and military applications and are proposed as one of the key enablers for the futures software defined radios [3], [5]- [7]. However, there are some conceivable drawbacks to frequency tunable antennas, which exhibit high RF power loss, limited power handling capability, poor linearity, and especially high dc power consumption of active tuning circuit components.…”

Section: Introductionmentioning

confidence: 99%

A Frequency Tuning Method for a Planar Inverted-F Antenna

Komulainen

Berg

Jantunen

et al. 2008

IEEE Trans. Antennas Propagat.

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Abstract-A novel method is presented for electrically tuning the frequency of a planar inverted-F antenna (PIFA). A tuning circuit, comprising an RF switch and discrete passive components, has been completely integrated into the antenna element, which is thus free of dc wires. The proposed tuning method has been demonstrated with a dual-band PIFA capable of operating in four frequency bands. The antenna covers the GSM850, GSM900, GSM1800, PCS1900 and UMTS frequency ranges with over 40% total efficiency. The impact of the tuning circuit on the antenna's efficiency and radiation pattern have been experimentally studied through comparison with the performance of a reference antenna not incorporating the tuning circuit. The proposed frequency tuning concept can be extended to more complex PIFA structures as well as other types of antennas to give enhanced electrical performance.

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Reconfigurable antennas for portable wireless devices

Cited by 129 publications

References 3 publications

A capacitively loaded antenna for use in mobile handsets

A capacitively loaded antenna for use in mobile handsets

Reconfigurable Patch Antennas With Four-Polarization States Agility Using Dual Feed Ports

A Frequency Tuning Method for a Planar Inverted-F Antenna

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