[PDF] Top 20 Study of Different Reconfiguration Techniques in patch antenna for Cognitive Radio Application

... Reconfigurable antenna covers (3-5) GHz at position 2 and (5-9) GHz at position ...UWB antenna produce return loss of - 30dB both in position one and ...communicating antenna can be controlled via a ... See full document

... Microstrip patch antenna can be implemented for both sensing and communication ...two different technologies either by varactor as in [18-21] or/and PIN diode switching as in ...the patch, and ... See full document

... of cognitive radio system is to determine the spectrum holes using an ultra wide band sensing antenna and to transmit using a narrow band frequency reconfigurable antenna in the identified ... See full document

... designed patch antenna is intended for wireless ...for different feeding techniques which must have to be verified with the fabricated ...this antenna ultimately restricts its usage ... See full document

... the antenna characteristics like resonant frequency, radiation pattern, polarization or even combinations of the characteristics above mentioned ...MIMO techniques, satellites, smart antennas, ... See full document

... NB antenna has 2:1 VSWR bandwidth from ...The antenna has a stable gain around 5dBi with radiation efficiency greater than ...the antenna ports. In [14], a more complex antenna design was ... See full document

... bow-tie antenna on a patch. A patch antenna is also known as a rectangular micro-strip ...of radio antenna with a low profile, which can be mounted on a flat ...the ... See full document

... Eigenvalue-based Detection (EBD) has been introduced as an efficient technique to perform spectrum sensing in Cognitive Radio (CR). Using the EDB approach, the secondary receiver is able to infer the ... See full document

... communication application needs compact, low cost antennas in both military and com- mercial ...volume antenna called microstrip antenna may be used for all the above mentioned ...microstrip ... See full document

... reconfigurable antenna was designed[4]-[6]. The postulated antenna in the paper is proficient to reconfigurable seven different beam ...Dipole antenna, Monopole antenna, loop ... See full document

... fractal patch antenna array Four different designs of antenna are simulated (1) modified triangular fractal patch antenna (MTFPA) (2) 2×2 modified fractal patch ... See full document

... Moreover cognitive radio [12] are likely to face dynamic environments where antenna selection [15] changes with changing channel conditions, hence a computationally efficient antenna selection ... See full document

... of cognitive radios such as the coexistence of CR users with primary users and the wide range of available spectrum incurs substantially different challenges for spectrum sharing in CR ad hoc ... See full document

... Microstrip patch antenna with air dielectric can be very roughly estimated as ...the patch, half a wavelength, is about the same as the length of a resonant dipole, we get about 2 dB of gain from the ... See full document

... 2) Narrow Band II (8.23 GHz): To design a RA to operate at 8.23 GHz, all the three switches are kept in OFF state. Thus, a horizontal slot of dimension 22 mm × 1.5 mm is created in the ground plane which leads to narrow ... See full document

... Figure4 shows radiation pattern characteristics interms of directivity (dBm) and it radiated maximum signal in broadside direction and some power in backward direction. It offers 120 0 half power beam width and F/B is ... See full document

... user). Cognitive radio provides an opportunity to secondary users to use spectrum that are free for the moment (white ...space). Cognitive radio also provides the ability for the radio ... See full document

... rectangular patch with half rectangular fractal geometry is ...proposed antenna is fabricated on RT/duroid 5880 with relative permittivity ...proposed antenna can be used in the military for ... See full document

... has different transmission coefficient response, so by adjust- ing length and width of spiral band gap, we may generate good operational characteristics at all required bands of frequencies with small cross ... See full document

... Reasoning wrapper overview illustrating the knowledge representation delayline, reasoning and learning engine, constraints, and reconfigurable core entity A highly-evolved cognitive radi[r] ... See full document