It is recommended by several researches that RLSA antennas have possibility as an option for Wi-Fi devices antennas. Therefore, to dig deeper this possibility, we designed a RLSA antenna that mimics the specification of an antenna usually found in market, that is 16 dBi outdoor patch antenna. We carried out a parameterization to get a best RLSA antenna model. The model was then fabricated and measured. The measurement results are quite agrees with the simulation results. We found that with the same size of 0.05 m2, our RLSA antennas has better performance in term of gain (2 dB higher), S11 (7 dB lower), and beamwidth (90 0 wider) compared to the patch antenna. A significant result is that RLSA antenna has much wider bandwidth (815 MHz wider) compared to the patch antenna. A test to our RLSA antenna as an antenna for Wi-Fi devices shows that it works properly.
This paper presents a brief review of the development of small radial line slot array (RLSA) antennas for Wi-Fi devices. Based on the review, we concluded that some of the RLSA antennas designed and implemented on Wi-Fi devices are not optimal. Hence, this study aimed to design a small RLSA antenna for point-to-point 5.8 GHz Wi-Fi devices with an optimum design using a previously developed technique known as the extreme beamsquint technique. We used this technique to design and simulate 50 small RLSA antenna models, and then we fabricated the best model. We measured the performance of the fabricated prototype to verify the simulation results. The following measurement results were obtained: a gain of 17.28 dBi, a bandwidth of 1 GHz, a beamwidth of 30 0 , and a mainlobe-to-sidelobe ratio of 10 dB. These results meet the required antenna specifications for Wi-Fi devices. Moreover, the prototype was successfully tested as an antenna for a Wi-Fi device.
It is recommended by several researches that
Wireless communication for the future will use 5G standards, supported by an antenna system with Massive MIMO technology incorporating subarrays. A subarray microstrip antenna that has small element spacing will result in mutual coupling effects. This paper proposes design of a two rectangular subarray antenna with coaxial feeding for massive MIMO development and analysis the effect of mutual coupling at varying spacing element. Antennas are designed and simulated, namely a single antenna, a two element antenna arrayed in the E-plane and a two element antenna arrayed in the H-plane. The simulation results show that the mutual coupling of the two antenna elements arrayed in the E-plane for all element spacing is less than -20 dB, which means the mutual coupling effect can be ignored. Whereas the mutual coupling of the two antenna elements arrayed in the H-plane for all spacing elements is greater than -20 dB, which means the value of the mutual coupling must be considered. The bandwidth of the two element subarrays on E and H-plane is 77.3-88.5 MHz depending on the element spacing, which is still below 100 MHz required for 5G application.
Multiple-input multiple-output (MIMO) merupakan sistem komunikasi nirkabel yang menggunakan banyak antena di sisi pemancar maupun penerima. Sistem ini dapat meningkatkan kualitas komunikasi nirkabel pada jaringan teknologi 5G. Teknologi 5G memiliki kecepatan data yang sangat tinggi dan tunda (delay) yang sangat rendah. Jaringan 5G di Indonesia menggunakan frekuensi menengah, yaitu pada pita frekensi 3,5 GHz. Antena merupakan perangkat yang penting di jaringan nirkabel sistem MIMO. Oleh karena itu, penelitian ini mengusulkan perancangan elemen tunggal menggunakan teknik parasitic untuk memperlebar lebar bidang (bandwidth) guna memenuhi kebutuhan antena MIMO dan perancangan antena subarray 4×4 untuk MIMO 5G. Metode yang dilakukan pada penelitian ini diawali dengan menentukan spesifikasi target antena, kemudian melakukan perancangan elemen tunggal dengan parasitic patch. Penggunaan teknik parasitic patch pada elemen antena bertujuan untuk memperlebar bandwidth supaya memenuhi spesifikasi target. Frekuensi resonansi antena mikrostrip dipengaruhi oleh penambahan jumlah parasitic patch. Banyaknya frekuensi resonansi yang timbul menghasilkan bandwidth yang lebar. Kemudian, elemen tunggal dengan parasitic patch disusun menjadi subarray 4×4. Semua elemen disusun dalam satu substrat yang sama dengan jarak antarelemen dari titik pencatuan satu ke titik pencatuan lainnya sebesar 64,28 mm atau 0,75λ. Desain subarray sudah memenuhi target spesifikasi antena jika elemen subarray sudah mempunyai fractional bandwidth lebih dari 20% dan mutual coupling kurang dari −20 dB. Bahan yang digunakan dalam desain dan fabrikasi antena adalah substrat FR-4 (epoxy) dengan konstanta dielektrik (Ɛr) 4,3 dan ketebalan substrat (h) 1,6 mm. Hasil menunjukkan bahwa diperoleh bandwidth sebesar 735 MHz atau fractional bandwidth sebesar 20,35%, return loss 14,65 dB, mutual coupling 30,05 dB, dan gain 16,86 dB. Dengan demikian, subarray 4×4 untuk antena MIMO yang dirancang sudah memenuhi spesifikasi yang diinginkan.
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