Perancangan Bandpass Filter Pita Sempit pada Frekuensi L-Band untuk Aplikasi Synthetic Aperture Radar (SAR)

Abstract

Abstrak -Pada sistem Synthetic Aperture Radar (SAR), lebar pita menentukan resolusi yang diinginkan. Jika lebar pita sempit, maka resolusi yang didapatkan akan tinggi sehingga objek yang diamati akan lebih presisi. Untuk mendapatkan performa tersebut, dibutuhkan filter yang dapat menjaga lebar pita dari keluaran generator sinyal Chirp. Penelitian ini merancang filter dengan selektivitas tinggi pada frekuensi 1,27 GHz dengan lebar pita sebesar 10 MHz. Dengan karakteristik tersebut, perancangan filter dapat menggunakan resonator berbentuk kotak karena dapat menghasilkan lebar pita yang sempit. Dari hasil perancangan menggunakan duroid 5880 dengan permitivitas relative sebesar 2,2 didapatkan respon frekuensi pada 1,27 GHz dengan nilai S11 sebesar -36,25 dB dan nilai S21 sebesar -0,92 dB. Untuk lebar pita pada rentang frekuensi 1,265 -1,275 GHz didapatkan nilai S11 dan S21 secara berurutan sebesar -14,37 dB dan -1,09 dB serta -14,43 dB dan -1,08 dB. Abstract -In the Synthetic Aperture Radar (SAR) system, the bandwidth specifies the desired resolution. If the bandwidth is small, then the resolution obtained will be high so that the observed object will be more precise. To obtain such performance, a filter that can stabilize the bandwidth from Chirp Generator output is required. This study designs a filter with high selectivity at a 1.27 GHz frequency with a 10 MHz bandwidth. With these characteristics, a rectangular resonator filter design can be used because it can produce narrow bandwidth. The designed filter using Duroid 5880 with relative permittivity 2.2 obtains the frequency response at 1,27 GHz with value of S11 equal to -36,25 dB and S21 value equal to -0,92 dB. For bandwidth at the frequency range 1,265 -1,275 GHz, it is obtained the values of S11 and S21 respectively -14.37 dB and -1.09 dB also -14.43 dB and -1.08 dB.

Design of L-Band Power Amplifier by Using Microstrip-Based GaAs p-HEMT MMG15241H Transistor

“…E. Microstrip Line Microstrip line is a popular type of line used in the design of microwave power amplifiers [11]. The advantages of microstrip line are easy to be miniaturized and easy to be fabricated by using the circuit printing technique [1].…”

“…Based on (10) and (11), the value of the microstrip line wavelength is 130.71 mm, the length of input line (L1) = 3.67 mm and the length of input stub (Lin) = 35.20 mm, then the length of output line (L6) = 15.68 mm and the length of output stub (Lout) = 8.29 mm.…”

X-Band Microstrip Bandpass Filter Design using Square Loop Resonator and Defected Ground Structure

“…To get a better performance, a filter must have a good Q-factor value. Several studies have been done [1,2] to increase the Q-factor value by modifyingthe capacitive gap between the feed and the resonator.…”

Design of Dual Band Microstrip Antenna at L-Band and S-Band Frequencies for Synthetic Aperture Radar (SAR) Sensors

“…Synthetic Aperture Radar (SAR) is a remote sensing technology that has many benefits. It can be operated in various weather conditions at night because it is an active system that operates on microwave frequency [1] [2]. Remote sensing has an important role in various topographical, environmental, and military applications.…”