Papers by ISAR Publications
Ultra Wideband Band is a Radio Technology that uses low energy level for short range and also hig... more Ultra Wideband Band is a Radio Technology that uses low energy level for short range and also high bandwidth communications over a large position of radio spectrum. UWB antenna has low power requirements and also reduce fading from multipath. In UWB systems the signals are pulse based waveforms compressed in time rather than sinusoidal waveforms compressed in frequency. The FCC set aside the frequencies 3.1GHz to 7 GHz for UWB use in US. Usually Frequency above 10.7GHz are used in satellite TV and military radars. Even UWB antenna plays a major role in various applications as it behaves like a bandpass filter and reshapes to avoid undesired distortions. The information can be modulated on UWB signals by encoding the polarity of the pulse, its amplitude. Another feature of UWB is that pulses, are very short (less than 60cm for 500 MHz pulse). UWB range applications range from sensor networks to various position and tracking systems, where low rate communications are combined with precise radar systems with high speed spatial resolution. Various research works have addressed the design challenges faced by rf front end Engineers working on designing these systems. A wideband circularly polarized antenna in the 3.5GHZ and 7GHz range is discussed in . Various UWB based antennas have been discussed [2] and [3] , their performance over the operating range have been calculated and presented. A wideband Y slot antenna has be realised in [4] to improve the bandwidth of the operating range in addition to the achieved compactness f the micsrotrip antenna. An L shaped UWB antenna is presented in [5] and broadside radiation characteristics have been achieved as a result. In addition to the antenna design, [6] presents an band reject radiating patch in the said frequency range. The effects on the VSWR performance by the antenna structure in discussed in [7] and the antenna is realised.
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Papers by ISAR Publications