Over-The-Air Measurements of Small Radio Terminals Using Spheroidal Coupler

Tasuku TESHIROGI  Takashi KAWAMURA  Aya YAMAMOTO  Toru SAKUMA  Yasuhiko NAGO  Shigenori MATTORI  

Publication
IEICE TRANSACTIONS on Communications   Vol.E95-B   No.6   pp.2043-2050
Publication Date: 2012/06/01
Online ISSN: 1745-1345
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antennas and Propagation
Keyword: 
OTA,  TRP,  TRS,  spheroidal coupler,  

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Summary: 
We propose a novel method for measuring the matched total radiated power (TRP) and matched total radiated sensitivity (TRS) of small radio terminals, called over-the-air (OTA) measurement, using a spheroidal coupler (SC). To measure these parameters accurately in a multiple-reflection environment, such as in an SC, we developed two key techniques, i.e. displacement method and reflection compensation method, and verified their effectiveness by several simulations and fundamental experiments on a test transmitter. We also describe an absolute method for measuring antenna radiation efficiency using the displacement method. Furthermore, we describe TRP and TRS measurements for actual UMTS (Universal Mobile Telecommunications System) terminals, and verify that the proposed method achieves quick measurements with good accuracy. The SC provides a compact, low-cost OTA measurement system with high sensitivity and high speed.