By Robert E. Collin
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Additional info for Antennas and Radiowave Propagation (Mcgraw Hill Series in Electrical and Computer Engineering)
6. Conclusions Given the review of antenna types, one can ask which type of antenna is most appropriate for each speciﬁc UWB application. It has been demonstrated that each type presents advantages and disadvantages. 48 Ultrawideband Antennas: Design and Applications Fig. 22. Geometry of a square slot with a coplanar waveguide feed. To summarise, in frequency-independent antennas, there is a tendency for the current to become attenuated as the ﬁelds are radiated — these would be electrically large antennas.
22 shows the slot antenna studied in Sze and Shia (2008). 7 GHz. Slots may also be made in the metal patch, in order to add notch-bands. An ellipse-shaped slot antenna is shown in Li et al. (2006). Different types of feed are studied, using a microstrip line and a coplanar waveguide terminated by a U-shaped stub. The dimensions of the stub may be used to control the lower limit of the working band. In the 3–10 GHz range, the gain varies between 2 and 7 dBi and the return loss is below –10 dB. 6.
19) where GD is the group delay normalised by the maximum value. , 2006b). 2. Correlation-based averages: Angular range The study, given by the ﬁdelity factor, of the correlation between the input pulse to the transmitting antenna and the output pulse from the receiving antenna, is undoubtedly important. Another very useful analysis is the examining of the correlation between a pulse transmitted in a spatial direction, called the reference direction, and the pulses transmitted within a solid angle of interest .
Antennas and Radiowave Propagation (Mcgraw Hill Series in Electrical and Computer Engineering) by Robert E. Collin