Karakterisasi Antena Mikrostrip dengan H-slot untuk Aplikasi Synthetic Aperture Radar Pita X

Antena mikrostrip patch berbentuk persegi untuk aplikasi synthetic aperture radar pada pita X telah dirancang dan disimulasikan menggunakan teknik pencatuan proximity coupling. Pada bagian tengah patch ditambahkan slot berbentuk “H” untuk menghasilkan bandwidth lebar. Studi parameter dilakukan dengan mengubah parameter fisik antena untuk mengetahui pengaruhnya terhadap kinerja antena. Karakterisasi antena juga dilakukan dengan membandingkan rancangan antena mikrostrip tanpa slot dan dengan slot terhadap antena mikrostrip konvensional. Dimensi akhir rancangan antena mikrostrip dengan H-slot adalah 11,1mm mm. Hasil simulasi menunjukkan bahwa penambahan slot pada antena yang diajukan menghasilkan bandwith fraksional sebesar 34,23% pada rentang frekuensi 7,95GHz sampai 11,23GHz dan gain sebesar 3,57dB pada frekuensi 9,4GHz.

Long-range supercurrents through a chiral non-collinear antiferromagnet in lateral Josephson junctions

The proximity-coupling of a chiral non-collinear antiferromagnet (AFM)1–5 with a singlet superconductor allows spin-unpolarized singlet Cooper pairs to be converted into spin-polarized triplet pairs6–8, thereby enabling non-dissipative, long-range spin correlations9–14. The mechanism of this conversion derives from fictitious magnetic fields that are created by a non-zero Berry phase15 in AFMs with non-collinear atomic-scale spin arrangements1–5. Here we report long-ranged lateral Josephson supercurrents through an epitaxial thin film of the triangular chiral AFM Mn3Ge (refs. 3–5). The Josephson supercurrents in this chiral AFM decay by approximately one to two orders of magnitude slower than would be expected for singlet pair correlations9–14 and their response to an external magnetic field reflects a clear spatial quantum interference. Given the long-range supercurrents present in both single- and mixed-phase Mn3Ge, but absent in a collinear AFM IrMn16, our results pave a way for the topological generation of spin-polarized triplet pairs6–8 via Berry phase engineering15 of the chiral AFMs.

Antiferromagnetic proximity coupling between semiconductor quantum emitters in WSe2 and van der Waals ferromagnets

Quantum emitter magnetometry can probe interface magnetism in van der Waals ferromagnets. The hysteretic optical response demonstrates switching from ferromagnetic to antiferromagnetic proximity-coupling in the presence of surface oxides.

A Review Analysis on Microstrip Patch Antenna

This article presents the general overview of various antennas and a detailed study of Microstrip Antenna (MPA). The MPA designing equations and basic structure is explained in this manuscript. The properties of the materials required for MPA is summarized in table form. Some practical antenna structures are also explained here in order to analyze the overall view of MPAs after explanation of most common patch structure shapes. At last, the properties of Co-axial, Proximity Coupling, Aperture Coupling and stripline feeding are also introduce in terms of ease of fabrication, impedance, modelling, bandwidth etc.

Tunable Valley Polarization in Janus WSSe by Magnetic Proximity Coupling to CrI3 Layer

We investigate the electronic properties and valley physics of Janus monolayer WSSe on the substrate CrI3 layer based on first-principles calculations. It is shown that the K and K’ valley...

Dual-Band 2 × 2 MIMO Antenna with Compact Size and High Isolation Based on Half-Mode SIW

This paper presents a close-spaced dual-band 2 × 2 multiple-input multiple-output (MIMO) antenna with high isolation based on half-mode substrate integrated waveguide (HMSIW). The dual-band operation of the antenna element is achieved by loading a rectangular patch outside the radiating aperture of an HMSIW cavity. The HMSIW cavity is excited by a coaxial probe, whereas the rectangular patch is energized through proximity coupling by the radiating aperture of HMSIW. The antenna elements can be closely placed using the rotation and orthogonal arrangement for a 2 × 2 array. Small neutralization lines at the center of the MIMO antenna can increase the isolation among its elements by around 10 dB in the lower band and 5 dB in the higher band. A prototype of the MIMO antenna is fabricated and its performance is measured. The measured results show that the resonant frequencies are centered at 4.43 and 5.39 GHz with bandwidths of 110 and 80 MHz and peak gains of 6 and 6.4 dBi, respectively. The minimum isolation in both bands is greater than 35 dB. The envelope correlation coefficient is lower than 0.005 within two operating bands.