(英) |
Recently “antenna integrated radios” have been increasing rapidly which do not have terminals for monitoring Tx output power due to constraints on size and cost and requirements for multiple frequency use and multiple antennas. These radio terminals must be tested using radiation measurements where performance is expressed as total radiated power (TRP) and equivalent isotropically radiated power (e.i.r.p.). The existing standard method of measuring radiated power from equipment under test (EUT) is spherical scanning method in a radio anechoic chamber. This method , however, has serious problems such as a large-scale facility, long measurement time, and low sensitivity that makes it difficult to measure low-level spurious radiation.
In order to solve these difficulties, we previously proposed a novel TRP measurement method using a spheroidal coupler. This provides a compact facility, short measurement time, and very high sensitivity. Furthermore, it can measure radiation efficiency of antennas. Based on feasibility study, we developed a spheroidal coupler system and conducted basic experiments, consequently we verified that it performed TRP measurement with high accuracy.
This paper describes “displacement method”, the basic concept of the method, the spheroidal coupler we developed, and the results of TRP measurement |