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"Pada penelitian ini dirancang mikrostrip bandpass filter multiband Untuk mendukung transceiver multiband pada frekuensi 900 MHz untuk GSM, 1,8 GHz untuk WCDMA, 2,6 GHz untuk LTE, 3,5 GHz untuk fixed-WiMAX, 4,3 GHz untuk WLAN dan 5,2 GHz untuk WLAN. Perancangan dimulai menggunakan single-COS, kemudian ditambahakan sebuah resonator (DCOS) sehingga menghasilkan frekuensi 6 band. Pembuatan mikrostrip filter multiband dengan mempergunakan teknik folded Dual Cross open stub yang merupakan optimasi bentuk COS untuk menghasilkan filter ukuran lebih sederhana dan compact namun dapat memiliki frekuensi kerja yang multiband. Hasil pengkuran menujukan Pada frekuensi GSM, nilai S11 900 MHz sebesar -34.4 dB. Pada frekuensi WCDMA, nilai S11 pada 1,8 GHz sebesar -30 dB. Pada frekuensi LTE, nilai S11 pada 2,6 GHz sebesar -25,4 dB. Pada frekuensi fixed-WiMAX, nilai S11 pada 3,450 GHz sebesar -24,2 dB. Pada frekuensi WLAN, nilai S11 pada 4,25 GHz sebesar -27.3 dB. Pada frekuensi WLAN, nilai S11 pada 5,2 GHz sebesar - 29,4 dB. Pada frekuensi GSM, nilai S21 900 MHz sebesar -0.22 dB. Pada frekuensi WCDMA, nilai S21 pada 1,8 GHz sebesar -0.45 dB. Pada frekuensi LTE, nilai S21 pada 2,6 GHz sebesar -0.74 dB. Pada frekuensi fixed-WiMAX, nilai S21 pada 3,450 GHz sebesar -1.3 dB. Pada frekuensi WLAN, nilai S21 pada 4,25 GHz sebesar -1.4 dB. Pada frekuensi WLAN, nilai S21 pada 5,2 GHz sebesar -1.9 dB. Penambahan cross open stub menjadi dual cross openstub menghasilkan frekuensi kerja sebanyak 6 buah. Sementara itu, hasil pengukuran menujukan multiband filter terjadi pergeseran frekuensi tengah sebesar 5-10 MHz. Dari hasil simulasi maupun pengukuran menunjukan bahwa BPF ini telah mencapai kinerja yang diharapkan sesuai frekuensi teknis yang ditetapkan.

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In this research is designed microstrip bandpass filter to support multiband multiband transceiver at 900 MHz for GSM, WCDMA 1.8 GHz, 2.6 GHz for LTE, 3.5 GHz for fixed-WiMAX, 4.3 GHz for WLAN and 5,2 GHz for WLAN. The design starts using single-COS, then ditambahakan a resonator (DCOS) resulting in six frequency bands. Making multiband microstrip filter using the technique folded open stub Dual Cross which is the optimization of COS to filter sizes produce more simple and compact yet can have a multiband frequency work. Results pengkuran addressing the GSM frequency, 900 MHz S11 value of - 34.4 dB. In WCDMA frequency, the value of S11 at 1.8 GHz at -30 dB. In LTE frequency, the value of S11 at 2.6 GHz at -25.4 dB. In the fixed-WiMAX frequencies, the value of S11 at 3.450 GHz -24.2 dB. In the WLAN frequency, the value of S11 at 4.25 GHz at -27.3 dB. In the WLAN frequency, the value of S11 at 5.2 GHz -29.4 dB. At frequencies GSM 900 MHz S21 value of -0.22 dB. In WCDMA frequency, the value of S21 at 1.8 GHz of -0.45 dB. In LTE frequency, the value of S21 at 2.6 GHz of -0.74 dB. In the fixed-WiMAX frequencies, the value of S21 at 3.450 GHz of -1.3 dB. In the WLAN frequency, the value of S21 at 4.25 GHz of -1.4 dB. In the WLAN frequency, the value of S21 at 5.2 GHz of -1.9 dB. The addition of open stubs into a dual cross cross openstub generate frequencies up to 6 pieces of work. Meanwhile, the measurement results addressing multiband filter center frequency shift of 5-10 MHz. From the simulation results and measurements show that the BPF has achieved the expected performance according to established technical frequencies."

"Pada skripsi ini dilakukan rancang bangun quad-band bandpass filter yang bekerja pada frekuensi 0.9 GHz, 1.8 GHz, 2.3 GHz, dan 2.6 GHz. Quad-band bandpass filter dirancang dengan menggunakan resonator paralel yang dihubungkan secara cascade. Pada perancangan filer ditambahkan tiga transmisi zero mandiri untuk menghasilkan empat frekuensi resonansi yang diperoleh dengan menghubungkan resonator paralel secara seri dengan kapasitor atau induktor. Transmisi zero juga digunakan untuk meningkatkan rejection antar passband dan mengatur frekuensi resonansi. Perancangan quad-band bandpass filter menggunakan perankat lunak ADS lalu difabrikasi dengan menggunakan kompoen pasif pada PCB substrat FR-4. Hasil perancangan dan hasil fabrikasi terdiri dari parameter S11, S21, bandwidth, dan VSWR. Dari hasil simulasi didapat S11 sebesar 59.12, -25.80, -33.25, -33.84 dB, S21 kurang dari 0 dB, bandwidth sebesar 122, 94, 92, 87 MHz dan VSWR sebesar 1.002, 1.108, 1.044, 1.041 untuk frekuensi 950 MHz, 1.85 GHz, 2.35 GHz, dan 2.65 GHz. Hasil pengukuran didapat frekuensi resonansi bergeser menjadi 776 MHz, 1.526 GHz, 2.435 GHz, dan 2.787 GHz dengan besar S11 berturut-turut sebesar -20 dB, -13.6 dB, -36.8 dB, -34.6 dB, dengan nilai VSWR sebesar 1.22, 1.52, 1.03, dan 1.04. Hasil pengukuran fabrikasi quad-band bandpass filter menujukkan pergeseran frekuensi resonansi dari hasil resonansi namun tetap memenuhi spesifikasi return loss dan VSWR.

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In this paper, quad-band bandpass filter was designed and work at frequency 0.9 GHz, 1.8 GHz, 2.3 GHz, dan 2.6 GHz. Quad-band bandpass filter design was using shunt resonator that connected in cascade connection. In filter design, three independen transmissions zero was generated to provide four resonance frequencies by simply connect shunt resonator in series with capacitor or inductor. Transmission zero is also generated to enhance rejection area between each passband and to adjust resonance frequency. Quad-band bandpass filter design was used ADS software and then fabricated with lumped component in FR-4 substrate PCB. Parameter for simulation and measurement result was S11, S21, bandwidth, and VSWR.

Simulation result show that S11 was 59.12, -25.80, -33.25,-33.84 dB, S21 less than 0 dB, bandwidth 122, 94, 92, 87 MHz and VSWR was 1.002, 1.108, 1.044, 1.041 for resonance frequency at 950 MHz, 1.85 GHz, 2.35 GHz, and 2.65 GHz. Measurement result show that resonance frequency shifted to 776 MHz, 1.526 GHz, 2.435 GHz, and 2.787 GHz with respectively S11 result was -20 dB, -13.6 dB, -36.8 dB, -34.6 dB, and VSWR result was 1.22, 1.52, 1.03, and 1.04. Measurement result shown that resonance frequency was shifted compared to simulation result and satisfy S11 and VSWR specification."

"Buku yang berjudul "A handbook of active filters" ini ditulis oleh D. E. Johnson, J. R. Johnson, dan H. P. Moore. Buku ini merupakan sebuah buku panduan mengenai elemen-elemen filter."

"This book describes the design of low-voltage analog integrated filters using current mirrors, one of the most common building blocks both in analog and mixed-signal VLSI circuits, offering the advantages of low-voltage operation, derivation of resistorless topologies and electronic adjustment capability of their frequency characteristics. Several design examples are described, using current mirrors that fulfill the requirements of modern low-power wireless and biomedical applications, such as universal biquadratic filter topologies, complex filters for Bluetooth/ZigBee low-IF receivers and Wavelet filters for cardiac signal detection. The experimental results from the fabricated chips will also be presented, showing their utility in modern low-voltage low-power portable devices."

"This book brings together leading researchers to highlight recent advances and identify promising directions for future development. Motivated by the market for mobile and wireless communications, fully integrated analogue filters for high-frequency applications are now receiving great interest world-wide. Chapters are dedicated to Gm-C filters, MOSFET-C filters, active-LC filters, log-domain filters, switched-current filters, adaptive analogue filters and on-chip automatic filter tuning.The topical nature of the book and calibre of the authors ensures that this book will be of wide interest to the electronics community world-wide."

"Pada penelitian ini, dirancang sebuah triple-band bandpass filter (BPF) menggunakan hairpin Tri Section Step Impedance Resonator (TSSIR), yang dapat bekerja pada frekuensi 1400 MHz, 2400 MHz dan 3800 MHz secara bersamaan, dirancang, dibuat dan dievaluasi. Proses perancangan dan simulasi menggunakan perangkat lunak Advanced Design System (ADS). Bandpass Filter (BPF) yang dirancang menggunakan konfigurasi hairpin TSSIR yang dibuat pada Printed Circuit Board (PCB) FR-4 dengan nilai permitivitas 4.6, ketebalan substrat 1.6 mm dan loss tangent 0.002. Parameter yang digunakan saat perancangan ialah Insertion Loss, Return Loss, VSWR dan Bandwidth. Hasil simulasi Return Loss memiliki nilai -30.156 dB, -20.607 dB, dan -17.287 dB dan hasil fabrikasi pada penelitian ini memiliki nilai Return Loss sebesar dan -15.007 dB, -10.467 dB, dan -10.047 dB. Sedangkan nilai hasil simulasi Insertion Loss sebesar -0.682 dB, -0.855 dB, dan -1.262 dB dan hasil fabrikasi pada penelitian ini memiliki nilai Insertion Loss sebesar -2.236 dB, -2.983 dB dan -12.067 dB. Sehingga pada perancangan kali ini bandwidth pada frekuensi tengah yang ketiga (3800) MHz tidak memenuhi target disebabkan  adanya perbedaan nilai konstanta dielektrik substrat yang memiliki nilai pada rentang 4.6-4.9 pada tempat fabrikasi sehingga terjadinya pergeseran frekuensi tengah dan tidak tercapainya parameter yang diinginkan.

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In this research, a triple-band bandpass filter (BPF) was designed using a hairpin Tri Section Step Impedance Resonator (TSSIR), which can work at 1400 MHz, 2400 MHz and 3800 MHz simultaneously, was designed, fabricated and evaluated. The design and simulation process uses the Advanced Design System (ADS) software. The Bandpass Filter (BPF) was designed using a TSSIR hairpin configuration made on a Printed Circuit Board (PCB) FR-4 with a permittivity value of 4.6, a substrate thickness of 1.6 mm and a loss tangent of 0.002. The parameters used when designing are Insertion Loss, Return Loss, VSWR and Bandwidth. The results of the Return Loss simulation have values of -30,156 dB, -20,607 dB, and -17,287 dB and the fabrication results in this study have Return Loss values of and -15,007 dB, -10,467 dB, and -10,047 dB. While the insertion loss simulation results are -0.682 dB, -0.855 dB, and -1.262 dB and the fabrication results in this study have insertion loss values of -2.236 dB, -2.983 dB and -12.067 dB. So that in this design the bandwidth at the third center frequency (3800) MHz does not meet the target due to differences in the dielectric constant values of the substrate which have values in the range 4.6-4.9 at the fabrication site resulting in a shift in the middle frequency and the desired parameters are not achieved."