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Abstrak :
Cognitive radio merupakan teknologi telekomunikasi yang sedang dikembangkan dalam rangka mengatasi terbatasnya sumber daya spektrum frekuensi dan rendahnya efisiensi penggunaan spektrum yang ada. Skripsi ini membahas rancang bangun antena yang sesuai untuk aplikasi cognitive radio yang dapat bekerja pada frekuensi CDMA 1,9 GHz , WCDMA 2,1 GHz dan WiMAX 2,3 GHz untuk divais elektronik. Rancang bangun antena terdiri dari dua antena yaitu printed monopole antenna untuk pemindai dan Z-shape slot microstrip antenna untuk reconfigurable antenna. Dua antena tersebut di fabrikasi pada substrat FR4 dengan ground yang umum pada lapisan atasnya. Antena pemindai bertujuan sebagai pemindai spektrum dengan karakteristik pita lebar (1,0 GHz sampai 2,4 GHz). Reconfigurable antenna bertujuan untuk menghasilkan frekuensi resonansi dengan mengatur switch pada antenna yang memungkinkan antena memiliki tiga frekuensi resonansi yang berbeda. Hasil pengukuran menunjukkan sensing antenna memiliki impedance bandwidth 1,4 GHz (VSWR ≤ 2) dengan pola radiasi yang baik jika dibandingkan dengan hasil simulasi. Sedangkan reconfigurable antenna dapat bekerja dengan baik CDMA 1,9 GHz , WCDMA 2,1 GHz dan WiMAX 2,3 GHz sebagai prediksi pada hasil simulasi.

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Cognitive radio is technology that is developed as a solution for limited frequency spectrum resources and inefficiency spectrum utilization issues. This thesis discusses the design of antenna for cognitive radio applications applied into electronic device which can perform at CDMA, WCDMA and WiMAX frequency. The design consists of two antennas, namely a printed monopole antenna for sensing and Z-shape slot microstrip antenna for reconfigurable antenna. Two antennas are fabricated on FR4 substrate with common ground on the top layer. The sensing antenna is aimed at spectrum sensing, which has wideband characteristics (1.0 GHz to 2.4 GHz) and omnidirectional radiation pattern. The reconfigurable antenna is designed for generating the desired resonant frequency by adjusting the switch position on the antenna structure allowing for the antenna to have three different resonant frequencies. The measurement results show that the sensing antenna has 1.4 GHz impedance bandwidth (VSWR ≤ 2) with good agreement of the radiation pattern compared to the simulation results. Moreover, reconfigurable antenna can work well at CDMA 1.9 GHz, WCDMA 2.1 GHz dan WiMAX 2.3 GHz as predicted in the simulation results.

Abstrak :
Cognitive radio merupakan teknologi telekomunikasi yang memberikan solusi untuk masalah keterbatasan ketersediaan sumber daya spektrum frekuensi dan rendahnya efisiensi penggunaan spektrum yang ada. Skripsi ini membahas rancang bangun antena yang sesuai untuk aplikasi cognitive radio yang dapat digunakan pada alokasi frekuensi 1,8 GHz dan 2,35 GHz. Rancang bangun antena terdiri dari dua antena printed monopole di atas substrat FR4 dengan menggunakan ground sebagian. Antena pertama berfungsi sebagai sensing antenna dengan karakteristik wideband dan memiliki pola radiasi omnidirectional. Antena kedua merupakan communicating antenna dimana pada struktur antena diberi switch sehingga antena ini dapat merekonfigurasi frekuensi kerja. Hasil pengukuran menunjukkan sensing antenna memiliki impedance bandwidth 5,197 GHz pada kondisi switch OFF dan impedance bandwidth 10,328 GHz pada kondisi switch ON yang diukur pada batas RL ≤ -10 dB. Sedangkan reconfigurable communicating antenna memiliki frekuensi kerja 2,35 GHz pada kondisi switch OFF dan frekuensi kerja 1,8 GHz pada kondisi switch ON. ......Cognitive radio is technology developed nowadays to be the solution for limited frequency spectrum resource and inefficiency spectrum utilization issues. Design of antenna for cognitive radio application is proposed in this final project. The antenna is designed to work at 1.8 GHz and 2.35 GHz frequency allocation. The design consists of two printed monopole antenna printed over FR4 substrate sharing a common partial ground. The first antenna is the sensing antenna for spectrum sensing, having wideband characteristic and omnidirectional radiation pattern. The second one is the communicating antenna which is a frequency reconfigurable antenna with the existing switch on the antenna's structure so that the antenna will have two different working frequencies. The measurement shows that the sensing antenna has 5.197 GHz impedance bandwidth when the switch is OFF and 10.328 GHz impedance bandwidth when the switch is ON which is measured at return loss below -10 dB. While, the reconfigurable communicating antenna is working at 2.35 GHz when the switch is OFF and it is working at 1.8 GHz when the switch is ON.

Abstrak :
This major reference work provides the most up-to-date research advances and theories in cognitive radio technology, from cognitive radio principles and theory to cognitive radio standards and systems, from fundamental limits of cognitive radio channels to cognitive radio networks, from the current cognitive radio practices and examples to future 5G cognitive cellular networks. This handbook will include some emerging applications of cognitive radio in areas such as smart grid, internet-of-things, big data, small cell/heterogeneous networks, and in 5G. The potential readers include postgraduate students, academic staff, telecommunications engineering, spectrum policy makers, and industry entrepreneurs.

Abstrak :
This book provides the most up-to-date research advances and theories in cognitive radio technology, from cognitive radio principles and theory to cognitive radio standards and systems, from fundamental limits of cognitive radio channels to cognitive radio networks, from the current cognitive radio practices and examples to future 5G cognitive cellular networks. The book will include some emerging applications of cognitive radio in areas such as smart grid, internet-of-things, big data, small cell/heterogeneous networks, and in 5G. The potential readers include postgraduate students, academic staff, telecommunications engineering, spectrum policy makers, and industry entrepreneurs.

Abstrak :
[This book provides a broad introduction to Cognitive radio, which attempts to mimic human cognition and reasoning applied to software defined radio and reconfigurable radio over wireless networks. It provides readers with significant technical and practical insights into different aspects of Cognitive radio, starting from a basic background, the principle behind the technology, the inter-related technologies and application to cellular and vehicular networks, the technical challenges, implementation and future trends. The discussion balances theoretical concepts and practical implementation. Wherever feasible, the different concepts explained are linked to application of the corresponding scheme in a particular wireless standard.;This book provides a broad introduction to Cognitive radio, which attempts to mimic human cognition and reasoning applied to software defined radio and reconfigurable radio over wireless networks. It provides readers with significant technical and practical insights into different aspects of Cognitive radio, starting from a basic background, the principle behind the technology, the inter-related technologies and application to cellular and vehicular networks, the technical challenges, implementation and future trends. The discussion balances theoretical concepts and practical implementation. Wherever feasible, the different concepts explained are linked to application of the corresponding scheme in a particular wireless standard., This book provides a broad introduction to Cognitive radio, which attempts to mimic human cognition and reasoning applied to software defined radio and reconfigurable radio over wireless networks. It provides readers with significant technical and practical insights into different aspects of Cognitive radio, starting from a basic background, the principle behind the technology, the inter-related technologies and application to cellular and vehicular networks, the technical challenges, implementation and future trends. The discussion balances theoretical concepts and practical implementation. Wherever feasible, the different concepts explained are linked to application of the corresponding scheme in a particular wireless standard.]