Differentially Fed Wideband Filtering Slot Antenna With Endfire Radiation Under Multi-Resonant Modes

Xu, Yanhui; Li, Zhu; Liu, Neng‐Wu

doi:10.1109/tap.2019.2925265

Cited by 31 publications

(11 citation statements)

References 20 publications

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“…Figure 1A depicts the geometry of a conventional λ /4 open‐ended slot antenna on a dielectric substrate of Arlon AD270 with a relative permittivity of ε r = 2.65, thickness of 1 mm and loss tangent of 0.0023. Since the maximum amplitude of the radiated electric fields outside the ground conductor could be maintained along the z ‐axis, 28 the end‐fire radiation pattern of the antenna toward almost the direction of the open end of the slot is successfully obtained, as shown in Figure 2A.…”

Section: Geometry and Analysis Of The Proposed Antennamentioning

confidence: 98%

Proposal and design of an end‐fire slot antenna with low back‐lobe and improved front‐to‐back ratio

Liu

2020

Int J RF Microw Comput Aided Eng

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This paper has proposed an end-fire slot antenna with back-lobe level suppression and front-to-back ratio (FBR) improvement. At first, the radiation characteristic of the conventional λ/4 slot antenna are meticulously investigated to initially demonstrate that its FBR can be maintained as high as about 6 dB. Then, the antenna under three different boundary conditions is deeply studied. The results reveal that the currents along the two sides of the metal ground are parallel to the slot radiator, resulting to affect the back-lobe radiation level to a great degree. As such, a pair of rectangular slots is properly etched on the two sides of the metal ground for further reduction of back-lobe radiation level and FBR improvement. Finally, a prototype antenna operating at 4.7 GHz is designed and fabricated. The measured results demonstrate that the back-lobe is indeed greatly decreased as predicted and the measured FBR of the proposed slot antenna exceeds 25 dB, where an increment of about 19 dB than the conventional λ/4 slot counterpart is successfully obtained, thereby evidently exhibiting better end-fire radiation performance.

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Section: Geometry and Analysis Of The Proposed Antennamentioning

confidence: 98%

Proposal and design of an end‐fire slot antenna with low back‐lobe and improved front‐to‐back ratio

Liu

2020

Int J RF Microw Comput Aided Eng

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“…By employing additional multiple slots and cutting the slot in different shapes, wideband performance of about 109% and 60% was successfully obtained in References 22,23. The antenna in Reference 24 yielded an improved bandwidth of about 34% by means of employing a stepped slot section. Furthermore, the stepped impedance slot antennas were further developed as an alternative approach to extend its bandwidth of more than 90% in References 25‐27.…”

Section: Introductionmentioning

confidence: 98%

Wideband microstrip‐fed slot antenna with end‐fire radiation under dual‐resonant modes

Liu

2020

Int J RF Microw Comput Aided Eng

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In this paper, a microstrip-fed narrow slot antenna with end-fire radiation and expanded bandwidth under dual-resonant modes operation is proposed. At first, the open-ended slot radiator is studied and used to effectively suppress all the undesired even-order modes, reduce the antenna size, and form up the end-fire radiation pattern simultaneously. After that, by symmetrically introducing a pair of slot stubs near the electric-field distributions nodal lines of its second oddorder mode, the resonant frequency of second odd-order mode is gradually moved down. As such, the first and second odd modes could be effectively moved in proximity to each other, thus resulting in the improved impedance bandwidth of the slot antenna under dual-mode operation. To validate the predicted results, the proposed wideband microstrip-fed slot antenna is in final fabricated and measured. Both simulated and measured results are derived with good agreement. Measured results indicate that the impedance bandwidth of the slot antenna has achieved an immense enhancement up to about 25.5% (2.43-3.14 GHz). Moreover, the front-to-back ratio (FBR) beyond 6.0 dB has been successfully obtained across the whole operating band for end-fire radiation.

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“…Among those methods mentioned above, the pattern diversity technique can achieve low ECC without occupying a large footprint, which requires the radiation pattern of each element antenna to be oriented in different directions. Directional antennas are good candidates for pattern diversity, such as the Yagi‐like antennas 7–12 and the open‐slot antenna 13 . Besides, it is known from 14 that when two orthogonal complementary sources (magnetic dipole and electric dipole) are excited with the same phase and amplitude, a standard unilateral radiation pattern which is cardioid‐shape in both orthogonal planes can be obtained.…”

Section: Introductionmentioning

confidence: 99%

“…Directional antennas are good candidates for pattern diversity, such as the Yagi-like antennas [7][8][9][10][11][12] and the open-slot antenna. 13 Besides, it is known from 14 that when two orthogonal complementary sources (magnetic dipole and electric dipole) are excited with the same phase and amplitude, a standard unilateral radiation pattern which is cardioid-shape in both orthogonal planes can be obtained. The antenna designed based on this principle can be called complementary antenna, or Huygens source antenna.…”

Section: Introductionmentioning

confidence: 99%

Compact planar multiple‐input‐multiple‐output antenna with pattern diversity based on the complementary theory

Wen

Dong

2021

Micro & Optical Tech Letters

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A three‐port planar multiple‐input‐multiple‐output (MIMO) antenna system with pattern diversity based on the complementary theory is presented in this letter. Three directional antennas without any directors or reflectors are introduced as the radiating elements, which are rotationally symmetrical and sharing a small ground. The unilateral radiation pattern is achieved for each antenna element based on the complementary theory, where an electric dipole and a magnetic dipole are placed orthogonally and excited simultaneously. An inverted L‐shaped stub is used as the electric dipole. A capacitively loaded loop operated on the zeroth‐order resonant mode is applied as the equivalent magnetic dipole. The capacitive loading is realized with six periodical interdigital left‐handed series capacitors. Furthermore, a defected ground structure between each two ports is adopted to further improve the isolation. The operation mechanism of the proposed MIMO antenna is discussed and experimentally verified. The proposed MIMO antenna system has a measured fractional bandwidth of 7.2% (3.33–3.58 GHz) with |S11| < −10 dB. The port isolation is better than 15 dB and the envelope correlation coefficient is less than 0.0234 in the operation band.

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Differentially Fed Wideband Filtering Slot Antenna With Endfire Radiation Under Multi-Resonant Modes

Cited by 31 publications

References 20 publications

Proposal and design of an end‐fire slot antenna with low back‐lobe and improved front‐to‐back ratio

Proposal and design of an end‐fire slot antenna with low back‐lobe and improved front‐to‐back ratio

Wideband microstrip‐fed slot antenna with end‐fire radiation under dual‐resonant modes

Compact planar multiple‐input‐multiple‐output antenna with pattern diversity based on the complementary theory

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