Systematic Pattern Synthesis for Single Antennas Using Characteristic Mode Analysis

Li, Hui; Sun, Sining; Li, Wencong; Wu, Miao; Zhou, Changfei

doi:10.1109/tap.2020.2978939

Cited by 33 publications

(17 citation statements)

References 40 publications

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“…To reduce the user effect, an omni-directional pattern with radiation nulls in the boresight direction, i.e., along the positive and negative of z-axis, is preferred [20]. As shown in Fig.…”

Section: Cma Of Connected Double Plate Modelmentioning

confidence: 99%

“…For instance, some design techniques have been found to be effective for mitigating user effects in terminal antennas in LTE low band [12]- [23]. However, existing contributions focus on single-antenna design [12]- [20] and only a few consider MIMO antennas [21]- [23].…”

Section: Introductionmentioning

confidence: 99%

“…A comparison study in [23] reveals that the CMA-based MIMO terminal antennas are in general more robust to user effects in the low band, in terms of impedance matching and correlation. Moreover, it has been found that the excited modes of an antenna can substantially influence its user effects [18]- [20]. Since the antenna pattern is a linear combination of the far-fields of the characteristic modes (CMs) excited by the antenna, the user effects on a given CM can be found.…”

Section: Introductionmentioning

confidence: 99%

“…It is not uncommon in the literature to utilize far-field properties to guide antenna designs involving proximity of human tissue, due to the lack of consensus on a suitable near-field figure-of-merit [24]. Subsequently, this insight is applied using CMA to synthesize a desired antenna pattern consisting of several chassis modes [20]. However, the design is single-port and the achieved bandwidth is small (6%).…”

Section: Introductionmentioning

confidence: 99%

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Low-Band MIMO Antenna for Smartphones With Robust Performance to User Interaction

Aliakbari

Lau

2021

Antennas Wirel. Propag. Lett.

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This letter proposes a two-port MIMO smartphone antenna for frequency bands below 1 GHz, which is robust to user effects. The design is achieved by first analyzing the characteristic modes of a chassis that includes the large screen. Two modes predicted to be less affected by the user than other commonly used modes are selected. The modal currents and near-fields of the two desired modes then guide the design: The monopole-like mode introduced by the screen is tuned to resonance using shorting pins and selectively excited using the center feed location. The nonresonant loop mode is selectively excited for the first time by four inductive feeds added along the longer sides of the chassis, with proper phase shifts provided by a feeding network. The proposed antenna features isolation of above 19 dB and envelope correlation coefficient of below 0.12 in the considered scenarios. The measured bandwidth is above 15% for both ports, and the average radiation efficiency is 2 dB and 4.57 dB higher for two user scenarios with respect to a reference design. Moreover, no adaptive matching is needed as the impedance matching is robust to the user hand/head.

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Section: Cma Of Connected Double Plate Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Low-Band MIMO Antenna for Smartphones With Robust Performance to User Interaction

Aliakbari

Lau

2021

Antennas Wirel. Propag. Lett.

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“…17) is capable to efficiently excite the desired Mode 1 and Mode 3 identified from the previous CMA, the MWC (an parameter of the equation ( 1)) has been calculated. In particular, the correlation coefficient among CMs and the obtained radiation pattern [38], [43] has been exploited to retrieve the modal excitation degree. As it is apparent from Fig.…”

Section: B Modal Excitation Cofficientmentioning

confidence: 99%

Characteristic Modes Analysis of Non-Uniform Metasurface Superstrate for Nanosatellite Antenna Design

Dicandia

Genovesi

2020

IEEE Access

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This work addresses the use of the Characteristic Modes Analysis (CMA) for tailoring a Metasurface (MTS) in view of exploiting it in compact, low-profile, Circularly Polarized (CP) antennas. The investigated non-uniform MTS is exploited as a superstrate in the design of a novel compact and low-profile antenna for nanosatellite applications. The MTS consists of a 3 × 4 array of unequal patches arranged in a rectangular lattice. The antenna parameters are carefully tailored by using the CMA to achieve a significant performance enhancement with respect to a uniform MTS in terms of both Axial Ratio (AR) bandwidth and aperture efficiency. The reliability of the CMA approach is verified by assessing the overall performance of the whole radiating structure comprising the stripline feeding excitation. The proposed MTS antenna is compact (0.068 0) provides a remarkable aperture efficiency going from 86 % up to 96 % and an AR coverage in the upper hemisphere greater than 84 % within the desired S-band (2.025 -2.29 GHz).

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Design of adjustable‐dual‐beam and constant‐polarization antenna by odd mode of coupled‐patch in central symmetry

Lin

2021

Int J RF Microw Comput Aided Eng

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In this article, two coupled patch elements in central symmetry are used to produce a pair of even/odd characteristic modes with single‐/dual‐beams. It is found that the pointing direction of dual‐beam could be adjusted in both horizontal and vertical planes with unchanged polarization. Common‐fed configuration is adopted to effectively excite the odd mode and fully suppress the even mode. Modal impedance analysis is performed for the proposed antenna to determine the two feeding positions. A prototype antenna with its dual‐beam rotated by 45° in horizontal plane and inclined by 40° in vertical plane is fabricated and measured. The antenna possesses a 10‐dB impedance bandwidth of 0.73% and a radiation gain of 7.0 dBi.

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Systematic Pattern Synthesis for Single Antennas Using Characteristic Mode Analysis

Cited by 33 publications

References 40 publications

Low-Band MIMO Antenna for Smartphones With Robust Performance to User Interaction

Low-Band MIMO Antenna for Smartphones With Robust Performance to User Interaction

Characteristic Modes Analysis of Non-Uniform Metasurface Superstrate for Nanosatellite Antenna Design

Design of adjustable‐dual‐beam and constant‐polarization antenna by odd mode of coupled‐patch in central symmetry

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