Radiated efficiency of aperture tuned antennas: Comparison of MEMS Digital Variable Capacitor and fixed ceramic capacitors

Tornatta, Paul; Gaddi, R.; Morrell, Larry; Joshi, V. K.; Bishop, Bruce F.

doi:10.1109/mwsym.2014.6848582

Cited by 5 publications

(4 citation statements)

References 4 publications

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“…As the measurements or theoretical derivation of the exact value of C coupling is beyond the scope of this article, we present a tendency of the total parasitic capacitance as a function of C coupling . Such a low minimum capacitance is no able to be achieved even by the state-of-the-art microelectronic mechanical system (MEMS) technologies [10]. frequency from 920 to 770 MHz by changing the electrical length of the radiator while the DVC provide a fine tuning at each SPST state, that is, DVC changes the center frequencies from 920 to 820 MHz when the SPST is on and from 770 to 720 MHz when the SPST is off.…”

Section: Antenna Structurementioning

confidence: 99%

Section: Antenna Structurementioning

confidence: 99%

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A new frequency‐reconfigurable antenna using coupling patterns for mobile handsets

Lee

Cho

2015

Micro & Optical Tech Letters

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This letter focuses on the design of a new frequencyreconfigurable antenna for a mobile handset application. The proposed antenna supports the most important long-term evolution bands: band 17 (704-746 MHz), band 13 (746-787 MHz), band 5 (824-894 MHz), and band 8 (880-960 MHz). A digital variable capacitor (DVC) is used via a coupling pattern proximity to the aperture of an inverted F antenna (IFA) to which a single-pole single throw RF switch is connected to take advantages of the two different kinds of tuning elements. We show that the proposed antenna is able to have a quasicontinuous and wide range of frequency tuning capabilities over 700-960 MHz through simulations and experiments. We also show that the coupled aperture used for connection of the DVC to the aperture of IFA is helpful for reducing the ohmic losses in the DVC from the antenna efficiency degradation which is the most important figure of merit for frequency reconfigurable antennas based on the active tuning elements.

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Section: Antenna Structurementioning

confidence: 99%

Section: Antenna Structurementioning

confidence: 99%

A new frequency‐reconfigurable antenna using coupling patterns for mobile handsets

Lee

Cho

2015

Micro & Optical Tech Letters

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“…Aperture tuning has been widely used as it can maximise antenna radiation efficiencies over wider‐frequency ranges while maintaining optimum power transfer properties [2]. However, there are two major problems in aperture tuning, which are the ohmic loss and the parasitic impedances of the tuning elements.…”

Section: Introductionmentioning

confidence: 99%

“…The series resistances of the impedance matching components have a large impact on the radiation efficiency especially at low frequencies such as 700 MHz [3]. A recent study showed that a microelectromechanical systems (MEMSs) variable capacitor with small equivalent series resistance (ESR) can reduce antenna efficiency degradations by the variable capacitors [2]. The MEMS technology looks a more promising solution for aperture tuning because of its low ESR properties as well as its small minimum capacitance compared with other types of variable capacitors.…”

Section: Introductionmentioning

confidence: 99%

Frequency tunable antenna using coupling patterns for mobile terminals

Lee¹,

Cho

2015

Electron. lett.

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A frequency-reconfigurable antenna based on aperture tuning using a coupled aperture structure on which a digital variable capacitor (DVC) is connected is presented. The coupled aperture structure is used to avoid electrical contact between the antenna radiator and the DVC in order to reduce antenna efficiency degradation due to ohmic losses at the DVC. The operating frequency is 700 MHz where the antenna efficiency is sensitive to the ohmic loss in the DVC. Analysis based on measurements and simulation confirm the benefits of using the coupled aperture structure over the conventional aperture tuning. It is shown that the coupled aperture plays a key role in reducing the impact of the equivalent series resistance of the DVC component on the antenna efficiency at 700 MHz.

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High-Linearity 3-Bit Frequency-Tunable Planar Inverted-F Antenna for RF Applications

Chaabane¹,

Madrangeas²,

Chatras³

et al. 2017

Antennas Wirel. Propag. Lett.

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Radiated efficiency of aperture tuned antennas: Comparison of MEMS Digital Variable Capacitor and fixed ceramic capacitors

Cited by 5 publications

References 4 publications

A new frequency‐reconfigurable antenna using coupling patterns for mobile handsets

A new frequency‐reconfigurable antenna using coupling patterns for mobile handsets

Frequency tunable antenna using coupling patterns for mobile terminals

High-Linearity 3-Bit Frequency-Tunable Planar Inverted-F Antenna for RF Applications

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