On the efficiency of frequency reconfigurable high-Q antennas for 4G standards

Barrio, Samantha Caporal Del; Pelosi, Mauro; Pedersen, Gert Frølund

doi:10.1049/el.2012.1315

Cited by 17 publications

(10 citation statements)

References 3 publications

(3 reference statements)

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“…In this way the exact requisite tuning resolution can be achieved without the need for moving to another position on PCB, as is the case for tuning conventional antenna concepts [45]- [48]. Furthermore, by having at the open-end of the antenna, the influence on the natural mode of the antenna is minimized, Fig.…”

Section: B Pros and Consmentioning

confidence: 99%

Compact Agile Antenna Concept Utilizing Reconfigurable Front End for Wireless Communications

Bahramzy

Jagielski²,

Svendsen³

et al. 2014

IEEE Trans. Antennas Propagat.

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The conventional full-duplex radio communication systems require that the radio transmitter (Tx) is active at the same time as the radio receiver (Rx). The Tx and the Rx are using separate dedicated frequency bands and the Tx-Rx isolation is ensured by duplex filters. However, increasing number of frequency bands crave for multiband and multimode operation, which either require agile duplexers or a bank of narrow-band filters with a switch. While practical agile duplexers are not available, a bank of narrow-band filters with a switch is bulky and incurs switching loss. This paper proposes an approach that separates the Tx and Rx chain throughout the front end (FE). The complexity of the FE is reduced dramatically by replacing the duplex filters with tunable filters and closely integrating the tunable antennas in the FE, providing filtering which can be used to lower requirements for the tunable filters. For this purpose, very small narrow-band antennas are designed, which can cover 1710-2170 MHz by using tunable capacitors. Simulations and measurements of the antenna concept are carried out in the proposed FE architecture, serving as a proof of concept.Index Terms-Capacitive loaded antenna, highantenna, inductive loaded antenna, MEMS, radio frequency (RF) front-end (FE), Rx antenna, transmitter-receiver isolation, tunability, Tx antenna.

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Section: B Pros and Consmentioning

confidence: 99%

Compact Agile Antenna Concept Utilizing Reconfigurable Front End for Wireless Communications

Bahramzy

Jagielski²,

Svendsen³

et al. 2014

IEEE Trans. Antennas Propagat.

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“…Aperture-tuned antennas provide the option to increase the radiation efficiency, but they pose another challenge: the tuning components have parasitic losses, resulting in a lower radiation efficiency. This can be especially problematic for high-Q antennas [46] (i.e. small bandwidths), where the antenna structure becomes highly resonant, resulting in high currents and therefore possibly a low radiation efficiency.…”

Section: Introductionmentioning

confidence: 99%

A New Design Method for Frequency- Reconfigurable Antennas Using Multiple Tuning Components

Bronckers

Roc'h

Smolders

2019

IEEE Trans. Antennas Propagat.

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“…Isolation study of wide-band, medium-band and narrow-band antennas is conducted in [9,14] to show the advantage of narrow-band antennas in terms of isolation. The challenges of frequency tunable high-Q antennas have been discussed in [15][16][17]. An investigation on currents running through the source, the short and the capacitor of a tunable planar inverted F antenna for hand-held devices, has been performed in [15].…”

Section: Introductionmentioning

confidence: 99%

“…The loss mechanism of tunable high-Q antennas is investigated in [16] and proposes a distributed tuning mechanism in order to reduce the loss because of the tuning component. The work in [17] highlights the efficiency issue of a tunable high-Q antenna by comparing it with a low-Q antenna. The effect of user on tunable high-Q antennas is studied in [9,18] As addressed in [15][16][17], there are some conceivable drawbacks of frequency tunable high quality factor (Q) antennas, which among other things are because of relative high current density on the antenna structure and limited tuning/matching component Q.…”

Section: Introductionmentioning

confidence: 99%

Self‐matched high‐ Q reconfigurable antenna concept for mobile terminals

Bahramzy

Jagielski²,

Svendsen³

et al. 2014

IET Science, Measurement & Technology

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This study presents reconfigurable antenna design for a front end (FE) that has separate transmit (Tx) and receive (Rx) path. In such an FE, the Tx and Rx antennas can be content with covering only the transmit and receive channels in a frequency band. Therefore they can be quite narrow-band. Narrow-band antennas can exhibit high losses, because of the relative high current density per area and limited tuning/matching component Q. To address this, a self-matched antenna design is introduced, having the tunable capacitor as the only physical component. The Tx and Rx narrow-band antennas are designed to cover the frequency range 1710-2170 MHz. Metrics as for example, impedance bandwidth and efficiency are obtained both in simulations and measurements.

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On the efficiency of frequency reconfigurable high-Q antennas for 4G standards

Cited by 17 publications

References 3 publications

Compact Agile Antenna Concept Utilizing Reconfigurable Front End for Wireless Communications

Compact Agile Antenna Concept Utilizing Reconfigurable Front End for Wireless Communications

A New Design Method for Frequency- Reconfigurable Antennas Using Multiple Tuning Components

Self‐matched high‐ Q reconfigurable antenna concept for mobile terminals

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