Development of Frequency GSM Signal Jammer

This paper gives an explanation to the concept of mobile Jamming and explores jamming in the two popular mobile networks: Global system for mobile communication (GSM) and digital cellular network (DCS). The designed intelligent jamming system blocks the controller channel only, also it operates only if an active mobile is in the controlled area. The ADS - advance Design System for Agilent software package is used analyzed and simulated the mobile jamming system. The Mobile Detector Phone Jammer successfully jammed all the four operators but the radius of the range did not get as expected in the designed, this project only focuses on blocking the signal transmission between the ranges 935 to 960 MHz when tested and performed well. This can be effectively find its use in School Examination hall and religion worship centers. Keywords—Jammer, Mobile Phone, Network, Signal, Frequency

Microwave Bandpass Filter Integrated with Notch Response for Wide-band Applications

This paper presents the design of wide-band bandpass filter using microstrip structure at 3-6GHz with fractional bandwidth of 66.67% based upon short-circuited stubs structure of 5th degree. In order to avoid the interference from existing system that operates in the frequency band, the folded stepped impedance resonator (SIR) was introduced to generate a narrow notch band at 5.2GHz. Pin diode is employ as switching mechanism for the notch response. This design is simulated by Advance Design System (ADS) software and using Roger Duroid 4350B with a dielectric constant of 3.48, substrate thickness 0.508mm and loss tangent 0.0019.The achieved return loss is better than 15dB and insertion loss is less than 1dB.The designed filter can be used in microwave communication systems such as wireless communication devices and military applications (radar system).

High Power Amplifier (HPA) pada Frekuensi 437,430 MHz untuk Aplikasi TTC Downlink Nano Satelit TEL-U SAT

Sistem Telemetry, Tracking, and Command (TTC) berfungsi sebagai interface komunikasi antara nano satelit dengan stasiun bumi. Salah satu perangkat yang penting dalam TTC adalah transmitter yang bekerja pada frekuensi downlink 437,430 MHz. Dari perhitungan link budget diperlukan sebuah high power amplifier (HPA) yang memiliki daya output 30 dBm agar data yang dikirimkan dapat diterima dengan baik oleh stasiun bumi. Pada tulisan ini dirancang dan direalisasikan HPA dua tingkat dengan frekuensi kerja 435 - 438 MHz. Penguat daya tingkat pertama menggunakan komponen aktif transistor BFR96S dan penguat daya tingkat kedua menggunakan komponen aktif transistor MRF555. Penyepadanan impedansi input menggunakan metode impedance matching Pi-network, sedangkan untuk penyepadanan impedansi interstage dan output menggunakan metode impedance matching T-network. Simulasi penguat daya menggunakan software Advance Design System (ADS 2011). Hasil perancangan HPA pada frekuensi 437,430 MHz menghasilkan gain sebesar 28,400 dB, VSWRin sebesar 1,291, dan VSWRout sebesar 1,295. Dari hasil pengukuran prototipe HPA, pada frekuensi 437,430 MHz menghasilkan gain sebesar 23,01 dB, VSWRin sebesar 2,126, VSWRout sebesar 1,695 pada bandwidth 50 MHz.

Perancangan Quadband BPF dengan Komponen Lumpeduntuk Sistem m-BWA

Ada banyak teknologi mobile broadband wireless access (m-BWA) yang saat ini digunakan, agar bisa mencakup seluruh teknologi m-BWA yang ada dalam sebuah perangkat maka diperlukan teknologi multiband . Salah satu komponen penting yang mendukung perkembangan teknologi m-BWA adalah bandpass filter (BPF), yang berfungsi untuk memilah-milah dan mengisolasi band yang spesifik dari interferensi pada transceiver radio frequency (RF). Pada penelitian ini akan dirancang quadband BPF yang beroperasi pada frekuensi tengah 950 MHz dan 1,85 GHz untuk aplikasi GSM, 2,35 GHz untuk aplikasi WiMAX, dan 2,65 GHz untuk aplikasi LTE secara simultan. Rangkaian quadband BPF dibangun dan dikembangkan dari konsep dualband BPF dengan menambahkan sejumlah cross coupling pada inductive coupling BPF tersebut untuk menghasilkan zero pada frekuensi tertentu yang diharapkan menggunakan komponen lumped. BPF yang dirancang memiliki spesifikasi, input return loss (S11) < -10 dB, insertion loss (S21) > -3 dB, dan voltage standing wave ratio (VSWR) antara 1 – 2, dan group delay kurang dari 10 ns. Perancangan dilakukan menggunakan perangkat lunak Advance Design System (ADS) dan kemudian difabrikasi berbasis printed circuit board (PCB). Hasil simulasi BPF menunjukkan kinerja quadband BPF memenuhi kriteria perancangan sedangkan hasil fabrikasi mengalami pergeseran.

Analysis of a Chaotic Memristor Based Oscillator

A chaotic oscillator based on the memristor is analyzed from a chaos theory viewpoint. Sensitivity to initial conditions is studied by considering a nonlinear model of the system, and also a new chaos analysis methodology based on the energy distribution is presented using the Discrete Wavelet Transform (DWT). Then, using Advance Design System (ADS) software, implementation of chaotic oscillator based on the memristor is considered. Simulation results are provided to show the main points of the paper.

A Macromodel of Memristor Using Symbolically Defined Devices

A macromodel of the prototype of memristor is developed in Advance Design System software (ADS) by using symbolically defined devices (SDDs). This model can simulate the electrical behaviors of a memristor. It is shown that the presented macromodel meets the requirements for simulations of application circuits.

The Design and Modeling of 2.4 GHz and 3.5 GHz MMIC LNA

LNA is an electronic amplifier that is required in receiver systems to increase the amplitude of the very low level signals from the antenna without adding too much noise. Software Advance Design System (ADS) was used to simulate the circuit and design the layout. LNA was designed using cascode topology with feedback techniques which produces better matching and unconditionally stable over the entire desired frequencies. For the 2.4 GHz operation, the amplifier achieves gain of 14.949 dB, noise figure of 1.951 dB and input reflection coefficient of -10.419 dB. With operating voltage supply at 3V, the total current consumption is 13 mA. For 3.5GHz amplifier, gain is 22.985 dB, noise figure is 1.964dB, input reflection coefficient is -12.427 dB and current consumption is 18 mA.