Title :
Radiation efficiency measurement based on Wheeler method using hybrid coupler and phase shifter
Author :
Watanabe, K. ; Ishii, Naohiro
Author_Institution :
Grad. Sch. of Sci. & Technol., Niigata Univ., Niigata, Japan
Abstract :
A method to evaluate reflection coefficients accurately by using a hybrid coupler and a sliding short is modified to save measurement time. For modified method, a digital phase shifter is used to vary the phase of reference standard. Radiation efficiency based on Wheeler method for a monopole antenna is evaluated by the modified method to confirm the effectiveness of using the digital phase shifter instead of the sliding short.
Keywords :
antenna radiation patterns; electromagnetic wave reflection; monopole antennas; phase shifters; waveguide couplers; Wheeler method; digital phase shifter; hybrid coupler; monopole antenna; radiation efficiency measurement; reflection coefficients; sliding short; Antenna measurements; Couplers; Phase measurement; Phase shifters; Reflection coefficient; Standards; Uncertainty; Wheeler method; hybrid coupler; phase shifter; radiation efficiency; reflection coefficient; uncertainty;
Conference_Titel :
Electromagnetics (iWEM), 2014 IEEE International Workshop on
Conference_Location :
Sapporo
DOI :
10.1109/iWEM.2014.6963704
