TCM-Based Bezel Antenna Design With Small Ground Clearance for Mobile Terminals

Deng, Changjiang; Xu, Zhan; Ren, Aidi; Hum, Sean V.

doi:10.1109/tap.2018.2880045

Cited by 51 publications

(26 citation statements)

References 33 publications

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“…do not need to be zero for the sum to be zero, i.e., the general case when ports 1 and 2 do not excite different modes. For example, if ports 1 and 2 excite modes 1 and 2 by the same magnitude [15], [25]. The orthogonality of far-field patterns in (2) at a given frequency is also a suitable property to be used for modal tracking [29].…”

Section: mentioning

confidence: 99%

“…The method was also applied for MIMO antenna design [14]. In contrast, in the preliminary study [26], a current-based tracking method [25] was used, and it failed to identify and track one of the modes, resulting in the missing mode (J4) not being used to enhance bandwidth.…”

Section: mentioning

confidence: 99%

“…Moreover, self-resonant antenna structures (e.g., PIFA, monopole and slot antennas), which are bulkier than their non-resonant coupling elements, are typically used for excitation by at least one of the two ports [10]- [15], [18], [19], [21]- [23]. Hence, efforts were made to completely avoid using self-resonant structures in MIMO antennas [9], [25].…”

Section: Introductionmentioning

confidence: 99%

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Low-Profile Two-Port MIMO Terminal Antenna for Low LTE Bands with Wideband Multimodal Excitation

Aliakbari¹,

Lau²

2020

Preprint

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It is challenging to design multiple-input multiple-output (MIMO) terminal antennas for LTE bands below 1 GHz, due to the conventional chassis offering only one resonant characteristic mode. Recently, it was shown that minor structural changes can yield additional resonant mode(s), which were used to design two-port MIMO antennas. However, the resulting bandwidth for the second port does not cover the low LTE bands. Herein, a new approach to structural changes and feed design is proposed for the design of a low profile (4 mm) two-port MIMO antenna that covers all common low LTE bands (0.75-0.96 GHz) with total efficiency of above 67%. The large symmetric bandwidth (25%) is achieved using three additional resonant modes obtained by structural changes as well as two simple probe-feed ports jointly exciting weighted combinations of the four modes over frequency. The envelope correlation coefficient of below 0.15 is facilitated by the different phase shifts of the characteristic electric fields at the port locations. Moreover, the design requires no ground clearance, no decoupling structure and the two ports are separated by only 0.2 wavelength. Finally, to show design flexibility, a third antenna is added to the top of the chassis to create a three-port MIMO antenna

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Section: mentioning

confidence: 99%

Section: mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Low-Profile Two-Port MIMO Terminal Antenna for Low LTE Bands with Wideband Multimodal Excitation

Aliakbari¹,

Lau²

2020

Preprint

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“…The resulting current distributions can be used for determining the feed locations for the antenna elements. The orthogonal modes can be excited separately with multiple exciters for good MIMO performance as is done, e.g., in [10], [19], [20], and in this letter, or multiple modes can be combined by modifying the structure to be excited with a single exciter for increased bandwidth [8], [15]. Below 1 GHz, there is only one dominant mode for a regular ground plane of a phone-sized device, which is the λ/2 dipole-type resonance along the longer dimension.…”

Section: A Characteristic Mode Analysismentioning

confidence: 99%

“…When the metal rim is kept completely intact, the antenna design is typically more difficult. Many of the unbroken metal rim antennas combine the operation of several different current loops in the metal rim with the ground plane structure for wideband operation [7]- [15]. However, the published designs have several weaknesses.…”

Section: Introductionmentioning

confidence: 99%

Unbroken Metal Rim MIMO Antenna Utilizing Antenna Clusters

Luomaniemi

Hannula

Kormilainen

et al. 2019

Antennas Wirel. Propag. Lett.

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This letter presents an antenna system for mobile devices with an unbroken metal rim. By utilizing the characteristic mode analysis for the unbroken metal rim, efficient multiple-inputmultiple-output operation can be achieved. The design is based on an antenna cluster technique that uses several coupled elements that are used to efficiently excite the modes of the rim. Nonresonant antenna elements and matching networks are used to couple to the metal rim. The design has small ground clearance of 5 mm and height of only 4 mm, and can operate in wide bandwidths both in 700-960 MHz low band and 1.56-4 GHz high band. Measurement results confirm that competent performance is achieved.

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Preprocessing for characteristic mode tracking based on the correlation

Liu

Yang

et al. 2020

Int J Numerical Modelling

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Mode swapping in characteristic mode analysis (CMA) affects consistent interpretation of the modal data. Mode tracking based on the eigenvector correlation can effectively determine the correct ordering of modes at each sampling frequency. However, there has been a lack of corresponding preprocessing for this mode-tracking algorithm. For example, the applicable frequency band cannot be determined in advance. In this paper, cosine similarity is used to calculate the correlation between modes of adjacent frequencies. It is then proposed that the 3/2 proportional relationship between the maximum size of the structure and the minimum operating wavelength can be used to choose the reliable operating band range of the algorithm. Meanwhile, it is recommended that the meshing side length should be less than one-tenth of a wavelength, and the adjacent sampling frequency interval should be less than the relative bandwidth of 10%. Through this preprocessing, correlation-based algorithms can efficiently implement mode tracking for open conductors.

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TCM-Based Bezel Antenna Design With Small Ground Clearance for Mobile Terminals

Cited by 51 publications

References 33 publications

Low-Profile Two-Port MIMO Terminal Antenna for Low LTE Bands with Wideband Multimodal Excitation

Low-Profile Two-Port MIMO Terminal Antenna for Low LTE Bands with Wideband Multimodal Excitation

Unbroken Metal Rim MIMO Antenna Utilizing Antenna Clusters

Preprocessing for characteristic mode tracking based on the correlation

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