Investigation on complementary antenna based on bow-tie shaped meander slot

Li, Ming; Hua, Guang; Yang, Kai

doi:10.1109/apcap.2015.7374504

Cited by 3 publications

(4 citation statements)

References 8 publications

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“…One straightforward approach to increase the electrical length is to increase the current path, which in turn increases the radiation resistance. Different configurations provide a longer current path 54 such as folded slot, 55 meander slot, 56,57 and bowtie slot 58 . Ideally, the electrically short slot configuration should be optimized to achieve the highest possible radiation resistance and hence, power efficiency.…”

Section: Discussionmentioning

confidence: 99%

“…Different configurations provide a longer current path 54 such as folded slot, 55 meander slot, 56,57 and bowtie slot. 58 Ideally, the electrically short slot configuration should be might increase the coupling. The vertical spacing between the slot elements within a module is more critical than the spacing between the slots of adjacent modules.…”

Section: Discussionmentioning

confidence: 99%

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Multiple slot modules for high field magnetic resonance imaging array coils

Alkandari

Bosshard

Huang

et al. 2023

Magnetic Resonance in Med

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Purpose Mitigating coupling effects between coil elements represents a continuing challenge. Here, we present a 16‐bowtie slot volume coil arranged in eight independent dual‐slot modules without the use of any decoupling circuits. Methods Two electrically short “bowtie” slot antennas were used to form a “module.” A bowtie configuration was chosen because electromagnetic modeling results show that bowtie slots exhibit improved B1+Pin$$ \frac{B_1^{+}}{\sqrt{P_{in}}} $$ efficiency when compared to thin rectangular slots. An eight‐module volume coil was evaluated through electromagnetic modeling, bench tests, and MRI experiments at 4.7 T. Results Bench tests indicate that worst‐case coupling between modules did not exceed −14.5 dB. MR images demonstrate well‐localized patterns about single excited modules confirming the low coupling between modules. Homogeneous MR images were acquired from a synthesized quadrature birdcage transmit mode. MRI experiments show that the RF power requirements for the proposed coil are 9.2 times more than a birdcage coil. Whereas from simulations performed to assess the proposed coil losses, the total power dissipated in the phantom was 1.1 times more for the birdcage. Simulation results at 7 T reveal an equivalent B1+ homogeneity when compared with an eight‐dipole coil. Conclusion Although exhibiting higher RF power requirements, as a transmit coil when the power availability is not a restriction, the inherently low coupling between electrically short slots should enable the use of many slot elements around the imaging volume. The slot module described in this paper should be useful in the design of multi‐channel transmit coils.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Multiple slot modules for high field magnetic resonance imaging array coils

Alkandari

Bosshard

Huang

et al. 2023

Magnetic Resonance in Med

View full text Add to dashboard Cite

show abstract

“…Thus, the advanced antenna exhibits the lowest configuration complexity in all tabulated antennas from comparative studies. Compared to the nonplanar antennas, 9,13,21,37,40,50 the proposed antenna has a relative lower profile and lower configuration. Compared to the antennas with low profile (i.e., height < 0.1λ g ), 22,24,25,39 the proposed antenna has a wider impedance bandwidth, F I G U R E 9 Simulated and measured radiation performances of the antenna prototype, (A) front-to-back ratio, and (B) boresight gain and efficiency higher front-to-back ratio and nearly equal E-and Hplane radiation patterns.…”

Section: Measurement and Verificationmentioning

confidence: 98%

“…The fourth one is the slot-dipole combined antenna. [29][30][31][32][33][34][35][36][37][38][39][40] A slot radiator cut on the metallic plane serves as a magnetic dipole, 41 while its inherent bi-directional radiation may be a drawback. 42,43 In this case, a metallic cavity box 44 or a plane reflector 45 should be backed one-quarter wavelength to the slot for back lobe suppression and enhanced impedance matching.…”

Section: Introductionmentioning

confidence: 99%