Single-Element Beamforming using Multi-Mode Antenna Patterns

Johannsen, Nils L.; Hoeher, Peter Adam

doi:10.1109/lwc.2020.2983023

Cited by 11 publications

(4 citation statements)

References 13 publications

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“…In [64], by using phase-shifted characteristic modes of an MPA, the null scanning angle could be changed from 0° to ±32°. Additionally, Liu and Zhu successfully reshaped the non-broadside radiation beam into a broadside beam by controlling the equivalent magnetic currents of a slot antenna [26], as shown in Figure 20, or an MPA [65] under higher-order modes. To further extend the MMR concept, a steerable multiport antenna was explored in [66].…”

Section: Multibeam/multipolarization Mmrmentioning

confidence: 99%

Multimode Resonator Technique in Antennas: A Review

Li¹,

Liu

2023

Electromag. Sci.

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During the past several decades, the multimode resonator (MMR) technique has been extensively investigated and widely used, with successful exploration of a variety of high-performance patch antennas, slot antennas, dielectric resonant antennas, dipole antennas, and so on. In this review paper, we summarize the research milestones for these MMR antennas worldwide as one of the most contributive research teams in this field. First, the basic working principles of the MMR technique are clearly illustrated and studied, including mode excitation, mode suppression, impedance performance improvement, and radiation performance improvement. Next, the research topics regarding impedance performance enhancement, i.e., widebandwidth operation, multibandwidth operation, and mutual coupling reduction, based on the MMR method are intensively described. After that, the relevant works on radiation performance enhancement, i.e., high-gain, wide-beamwidth, multibeam, multipolarization, low-cross-polarization, filtering-response, and leaky-wave antennas, based on the MMR method are extensively illustrated. By using this technique, several ideas about operating frequency reallocation, electric-field null control, radiation pattern reshaping, and efficiency null generation of the antennas are proposed and demonstrated by our team for the first time. In addition, the application of the MMR technique for wireless communication systems is introduced and presented, such as implant communication, wireless power transfer, and multiple-input multiple-output communication. With these arrangements, exploration and reporting of more interesting and useful MMR design methods can be anticipated in the future.

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Section: Multibeam/multipolarization Mmrmentioning

confidence: 99%

Multimode Resonator Technique in Antennas: A Review

Li¹,

Liu

2023

Electromag. Sci.

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“…Subsequently, the manifold matrices calculated in Section II are used to optimize the overall radiation based on digital beamforming, which allows arbitrary amplitudes and phases at each port. A patternbased beamforming for multi-mode antennas is described in [20], where a maximization of the gain towards a certain angle is targeted.…”

Section: Radiation Optimizationmentioning

confidence: 99%

Geometry-Based UAV MIMO Channel Modeling and Pattern Optimization for Multimode Antennas

Johannsen

Almasri

Hoeher

2022

IEEE Trans. Antennas Propagat.

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Improving safety is of general interest in aviation. Flight transponders used in collision avoidance systems advise pilots with information of potential collisions and avoidance resolutions. Some transponders are capable of transmitting the instantaneous position of the vehicle which might be turned off. To prevent autonomous flights from collisions, the transponder signals shall be used to estimate the direction-of-arrival (DoA). Recently, multi-mode antennas have been investigated for communication and localization purposes. Multi-mode antennas provide several orthogonal ports on a single radiator surface. This leads to a reduction of space and weight, which is of interest in airborne applications. To perform direction-of-arrival estimation as well as communication, a suitable channel model is required. In this contribution, a channel model fulfilling the requirements for both multiple-input multiple-output (MIMO) communication and DoA estimation is proposed. This channel model relies on the manifold matrix representation of the UAV under consideration. The derived description of a manifold matrix for the UAV use-case is used for an optimization to achieve a close to omnidirectional radiation pattern. Therefore, different optimization functions are derived and their performance is compared. The results of the optimization using the calculated manifold matrix are verified by measurements taken in an antenna measurement chamber.

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“…Based on the theory of characteristic modes [ 18 , 19 , 20 ], M

PAs are capable of realizing multiple orthogonal radiation patterns on a single conducting surface [ 21 , 22 , 23 ], hence reducing weight and volume. The utilization of M

PAs was investigated in [ 24 , 25 , 26 , 27 , 28 , 29 ] for communication and ultra-high-speed communication, in [ 27 ] for IoT applications with the possibility of high connectivity, and in [ 30 , 31 , 32 ] for DF use cases. Furthermore, approaches for joint communication and sensing specifically designed towards integrating M

PAs aboard UAVs are presented in [ 33 , 34 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

Direction-of-Arrival Estimation for Unmanned Aerial Vehicles and Aircraft Transponders Using a Multi-Mode Multi-Port Antenna

Almasri,

Johannsen,

Hoeher

2024

Sensors

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Increasing airspace safety is an important challenge, both for unmanned aerial vehicles (UAVs) as well as manned aircraft. Future developments of collision avoidance systems are supposed to utilize information from multiple sensing systems. A compact sensing system could employ a multi-mode multi-port antenna (M 3PA). Their ability to radiate multiple orthogonal patterns simultaneously makes them suitable for communication applications as well as bearing and ranging applications. Furthermore, they can be designed to flexibly originate near-omnidirectional and/or directional radiation patterns. This option of flexibility with respect to the radiation characteristic is desired for antennas integrated in collision avoidance systems. Based on the aforementioned properties, M 3PAs represent a compelling option for aircraft transponders. In this paper, direction-of-arrival (DoA) estimation using an M 3PA designed for aerial applications is put to the test. First, a DoA estimation scheme suitable to be employed with M 3PAs is introduced. Next, the validity of the proposed method is confirmed through numerical simulations. Lastly, practical experiments are conducted in an antenna measurement chamber to verify the numerical results.

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Single-Element Beamforming using Multi-Mode Antenna Patterns

Cited by 11 publications

References 13 publications

Multimode Resonator Technique in Antennas: A Review

Multimode Resonator Technique in Antennas: A Review

Geometry-Based UAV MIMO Channel Modeling and Pattern Optimization for Multimode Antennas

Direction-of-Arrival Estimation for Unmanned Aerial Vehicles and Aircraft Transponders Using a Multi-Mode Multi-Port Antenna

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