Summary
International Symposium on Antennas and Propagation
2010
Session Number:3TC1
Session:
Number:3TC1-4
Estimation Method of EUT Reflection Coefficient in TRP Measurement System Using a Spheroidal Coupler
Tasuku Teshirogi, Takashi Kawamura, Aya Yamamoto, Toru Sakuma, Yasuhiko Nago,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
Recently we see rapid increases of 'antenna integrated radios' such as RFID and UWB devices in addition to cellular phones and wireless LAN. These devices, having no monitoring terminals of Tx output power, must be tested based on radiation measurement where performances are expressed in terms of total radiated power (TRP). Existing methods for measuring TRP, [1] ? [3], however, need large-scale facility such as radio anechoic chamber and 2-axis positioner. Furthermore they are time consuming and difficult to measure low-level spurious radiation. Previously we proposed a novel TRP measurement method using a spheroidal coupler (SC) which achieves high-sensitive and short time measurement with a simple facility [4]. The key technology is "displacement method" that measures the EUT (Equipment Under Test) TRP by changing the positions of the EUT and the receiving antenna. In the system, however, theoretical basis whether the maximum received power might always coincide with TRP is not clear. This paper describes an estimation method of the reflection coefficient of EUT by "phase rotation technique" that provides a highly accurate and reliable TRP measurement. The developed system and the experimental results will be also shown.