In this paper, we obtain the left-handed circularly polarized (LHCP) and right-handed circularly polarized (RHCP) of triangular array eight patches antennas using corporate feeding-line for circularly polarized-synthetic aperture radar (CP-SAR) sensor embedded on unmanned aerial vehicle (UAV) with compact, simple, and efficient configuration. Although the corporate feeding-line design has already been developed, its design was for the side antenna view of 0° and only produced one of LHCP or RHCP instead of both. Here, the design for LHCP and RHCP eight patches array fed by corporate feeding-line having the side antenna view of 36° at f=1.25 GHz for CP-SAR are discussed. We use the 2016 version of computer simulation technology (CST) to realize the method of moments (MoM) for analyzing. The performance results, especially for gain and axial ratio (Ar) at resonant frequency are consecutively 13.46 dBic and 1.99 dB both of LHCP and RHCP. Moreover, the 12-dBic gain-bandwidth and the 3-dB Ar-bandwidth of them are consecutively around 38 MHz (3.04%) and 6 MHz (0.48%). Furthermore, the two-beams appeared at boresight in elevation plane for average beamwidth of 12 dBic-gain and the 3 dB-Ar LHCP and RHCP have similar values of around 12° and 46°, respectively.
In this paper, we obtain the basic configuration of the left-hand circular polarization (LHCP) array two patches stack triangular truncated microstrip antenna. This construction use the basic corporate feed microstrip-line with modified lossless T-junction power divider on radiating patch for circularly polarized-synthetic aperture radar (CP-SAR) sensor embedded on airspace with compact, small, and simple configuration. The design of Circular Polarization (CP) is realized by truncating the whole three tips and adjusting the parameters of antenna at the resonant frequency, f=5.2 GHz. The results of characteristic performance and S-parameter for the LHCP array two patches stack antenna at the resonant frequency show successively about 7.24 dBic of gain, 1.99 dB of axial ratio (Ar), and -11.43 dB of S-parameter. Moreover, the impedance bandwidth and the 3 dB-Ar bandwidth of this antenna are around 560 MHz (10.77%) and 50 MHz (0.96%), respectively.
Pemanfaatan jaringan WLAN untuk proses belajar mengajar di kelas sudah banyak dilakukan. Jaringan ini banyak dipakai karena mudah dan sederhana dalam implementasi, biaya relatif lebih murah dibandingkan dengan jaringan kabel, mendukung mobilitas user, serta adanya standard yang telah didefinisikan dengan baik. Meskipun demikian, performansi WLAN tidak dapat diprediksi dengan tepat, karena sangat tergantung dengan kondisi lingkungan pada saat digunakan. Kondisi lingkungan dapat berupa lokasi dan banyaknya client yang terhubung dalam satu layanan access point (AP), kondisi ruangan, serta keberadaaan perangkat elektronik lain yang menggunakan frekuensi ISM.Dalam penelitian ini, performansi WLAN dievaluasi berdasarkan parameter data rate, jenis stasiun yang digunakan (standar 802.11b dan 802.11g), serta batasan fragmentasi frame. Evaluasi performansi WLAN dilakukan melalui simulasi menggunakan opnet MODELER academic edition. Hasil simulasi menunjukkan bahwa dalam jaringan WLAN802.11, besarnya data rate sangat berpengaruh terhadap kinerja jaringan. Begitu juga dengan stasiun standar 802.11b, meskipun tetap bisa dilayani tetapi keberadaannya menyebabkan penurunan kinerja yang sangat signifikan. Dari 12 stasiun mobile yang ada dalam WLAN, dengan hanya 2 stasiun bertipe 802.11b telah menyebabkan penurunan kinerja sebesar 63% dalam pencapaian throughput. Mekanisme fragmentasi dapat digunakan sebagai alternatif untuk meningkatkan kinerja WLAN. Dari hasil simulasi, pemakaian mekanisme fragmentasi berhasil meningkatkan kinerja sebesar 38% sampai 50%.
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