[PDF] Top 20 A Hybrid Reconfigurable Antenna Design for Cognitive Radio System—Combination of Sensing and Reconfigurable Antennas

... A cognitive radio CR is a wireless transponder that can sense the environment in which it wishes to operate and can adapt itself to optimize its ...operation. Sensing the en- vironment may involve ... See full document

... In the underlay approach, secondary users should operate below the noise floor of primary users, and thus severe constraints are imposed on their transmission power (should be less than −42 dBm/MHz). One way to achieve ... See full document

... of cognitive radio. The communication link between two antennas typically suffers from multipath, interference, and ...involving antennas the including the usage of antenna diversity in ... See full document

... UWB antenna system is considered one of the most important parts of the UWB ...UWB antennas, which achieve the requirements of UWB systems such as compact size, wideband frequency range, and ... See full document

... proposed antenna can sense the spectrum using a separate UWB antenna to fulfill the condition of cognitive capability for CR system, but it requires more ...the antenna solution since ... See full document

... “UWB Sensing Antenna, Reconfigurable Transceiver and Reconfigurable Antenna Based Cognitive Radio Test Bed”, In this paper, a unique cognitive radio ... See full document

... patch antenna can be implemented for both sensing and communication ...printed antennas have been reported [18-23]. These antennas were tuned by using two different technologies either by ... See full document

... routine. Antenna technology is a key constituent in wireless communication ...frequency reconfigurable patched microstrip antenna is ...These antennas have capability to reconfigure it’s ... See full document

... selectively reconfigurable antenna capable of switching between a wide operating band of frequency range ...for sensing the entire band and then adjusting its bandwidth to select the suitable ... See full document

... Reconfigurable antennas are needed to cover different wireless services over a wide frequency ...frequency reconfigurable antenna is required for a cognitive radio ...a ... See full document

... Spectrum Sensing Cognitive Radio is considering only radio frequency ...The antennas at each end of the communications circuit are combined to minimize errors and optimize data ...more ... See full document

... UWB system becomes a hot topic which will bring us great potential interests ...UWB antennas have drawn more and more researching ...UWB system brings to us, it also carries ...UWB system and ... See full document

... The reconfigurable antenna constitution is got via integrating the band-go filter shown beforehand within the antenna feeding ...the antenna is made reconfigurable founded on the mode ... See full document

... A combination of spectrum sensing and frequency reconfigurable antenna design for cognitive radio is presented here and shown in ...proposed hybrid antenna can sense ... See full document

... For the return loss measurements we are using KEYSIGHT E5063A vector network analyzer. Fig. 8 show the picture of fabricated antenna in which two SPST RF switches (AMT2551011) are used to achieve ... See full document

... Printed antenna is one of the terms that have been widely used in the recent antenna ...of antenna has been rapidly developed over the past few ...of antenna with high performance and simple ... See full document

... distribution system, where specific bands are assigned to particular services and only licensed users are assigned to licensed ...[1]. Cognitive radio (CR) system has the capability to take the ... See full document

... the antenna. Another way to achieve this is by means of changing the antenna structure mechanically or adjusting the antenna matching ...frequency reconfigurable antennas were ... See full document

... The frequency reconfigurable antenna and polarization reconfigurable antenna is designed as per parameters stated in Table 1 and Table 2. These designed parameters are used to simulate and ... See full document

... The photograph of the manufactured reconfigurable antenna is shown in Figure 5. The antenna is fabricated on a 1.6 mm FR4 substrate with relative permittivity of ε r = 4.4. During measurements, the ... See full document