On designing dual-band matching circuits for capacitive coupling element antennas

Lehtovuori, Anu; Valkonen, Risto; Ilvonen, Janne

doi:10.1109/eucap.2014.6902531

Cited by 9 publications

(5 citation statements)

References 9 publications

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“…One possible dual-band matching circuit topology that can cover the desired bands is presented in [20]. This matching circuit combines the performance of low-pass and high-pass resonators (see Figure 3).…”

Section: Antenna Geometrymentioning

confidence: 99%

Multiband Frequency Reconfigurable 4g Handset Antenna With Mimo Capability

Ilvonen¹,

Valkonen²,

Holopainen³

et al. 2014

PIER

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Abstract-A novel frequency reconfigurable 4G Multiple-Input Multiple-Output (MIMO) handset antenna is presented and verified with experimental results. Frequency tuning is used to minimize the antenna volume and to compensate for the losses related to user-originated impedance detuning. Both antenna elements are independently frequency reconfigurable and can cover most of the LTE-A bands. The study compares the losses of CMOS-and MEMS-based digitally tunable capacitors (DTC). In addition, two prototypes with total antenna volumes of 1170 and 3900 mm 3 have been studied. The results show that the larger antenna structure operates with an efficiency better than 49% across the frequencies of 698-960 MHz and better than 56% across the frequencies of 1430-2690 MHz, when a MEMS-based DTC is used. In addition, a new method is introduced to estimate the suitability of the antenna geometry for frequency tunable antennas.

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Section: Antenna Geometrymentioning

confidence: 99%

Multiband Frequency Reconfigurable 4g Handset Antenna With Mimo Capability

Ilvonen¹,

Valkonen²,

Holopainen³

et al. 2014

PIER

Self Cite

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“…The example illustrates that the complete representation for the transforms given in comprehensive manner enables their flexible usage for versatile requirements. Conversely, representing transforms for converting one L‐matching section to another facilitates the design process .…”

Section: Examplesmentioning

confidence: 99%

Dual‐band matching of arbitrary loads

Lehtovuori

Valkonen

Valtonen

2014

Micro & Optical Tech Letters

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This article presents a systematic approach for dual‐band impedance matching of an arbitrary load using two matching circuits designed separately for the desired passbands as the basis. Exact transform equations for converting the obtained single‐band matching circuits into a dual‐band matching circuit can be applied to any kind of load impedance with arbitrary frequency‐dependency. The matching and impedance levels can be chosen individually for both passbands. The examples on the dual‐band matching of coupling‐element antennas demonstrate that also wide bandwidths can be achieved. The presented equations facilitate designing multiband matching circuits and are feasible also for solving double matching problems. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2958–2966, 2014

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“…14 However, due to the size limitation inherent in mobile devices, the optimization of the antenna geometry is very challenging. 15 Employing fixed decoupling and matching networks (DMN), realized with lumped circuits or transmission lines at the antenna feed points, is another promising method to compensate the decoupling [16][17][18][19] and impedance mismatch [20][21][22] for single-band and multiband communication. Although using these circuit-based techniques would reduce the difficulty and effort incurred in both designing the antenna and relaxing the constraints imposed on the antenna structure, a common drawback is that the decoupling and matching are only predefined across a fixed narrow bandwidth within both bands of operation.…”

Section: Introductionmentioning

confidence: 99%

An efficient tunable decoupling and matching method for simplifying compact dual‐band mobile terminal antennas

Chen

Hua

et al. 2021

Int J RF Mic Comp-Aid Eng

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An efficient tunable decoupling and matching method is proposed for simplifying compact mobile terminal antennas, that operates simultaneously in two independent bands. To enable carrier aggregation, the lower band in this design is tunable over the frequencies of interest for the traditional standards, while the upper band provides a fixed broad bandwidth to meet the bandwidth demands of 5G mobile terminal applications. Multi‐element antenna systems, containing a simple antenna structure combined with tunable networks to realize dual‐band decoupling and matching function, are systematically studied. The network structures are simplified to minimize the losses incurred in maintaining a good performance. To demonstrate the proposed approach, a two‐element antenna system is developed in which the lower band can be tuned over the frequency range of 2.25 to 2.75 GHz, and the broad upper band can cover frequencies from 4.42 to 6.21 GHz. Good performance such as high total efficiency, low envelope correlation coefficient and stable radiation patterns, can be observed, thus, validating the effectiveness of the proposed method for simplifying the antenna structure.

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On designing dual-band matching circuits for capacitive coupling element antennas

Cited by 9 publications

References 9 publications

Multiband Frequency Reconfigurable 4g Handset Antenna With Mimo Capability

Multiband Frequency Reconfigurable 4g Handset Antenna With Mimo Capability

Dual‐band matching of arbitrary loads

An efficient tunable decoupling and matching method for simplifying compact dual‐band mobile terminal antennas

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