Summary
International Symposium on Antennas and Propagation
2012
Session Number:POS2
Session:
Number:POS2-23
Orthogonal Linear Polarization Detection Slot-ring Antenna
Md. Azad Hossain, Eisuke Nishiyama, Ichihiko Toyoda,
pp.-
Publication Date:2012/10/29
Online ISSN:2188-5079
Summary:
The polarization detection of the received signal for many applications such as polarimetric sensors, MIMO, satellite remote sensing, ITS, radars etc. is becoming important in recent years. In a word, if the detection of the polarization characteristics and the wireless propagation conditions of the received signals are possible, the above application modules and systems will be advanced and expanded much more effectively. For instance, polarization detection antenna can be a vital element for the realization of the anti-jamming technology of radar systems. To meet this requirement, the authors have reported an orthogonally polarized microstrip array antenna for linear polarization discrimination, where �}45 deg. linear polarizations of the received signal can be discriminated at the array antenna design frequency. The array antenna was realized by 12 patch antenna elements and a double balanced RF multiplier. However, there was an impedance mismatch between the antenna elements and the feed lines. As a result, the output voltage for the polarization detection was low in spite of the 12 elements array antenna. In this paper, a single slot-ring antenna for linear polarization detection is proposed. The slot-ring antenna consists of four zero bias diodes which are loaded in every 45 deg. physical location on the slot-ring. The experimental output voltage of the single slot-ring antenna is observed higher than the 12 element array antenna. Therefore, the proposed slot-ring antenna is extremely simple with better performance. The diodes are loaded on the slot-ring in such that, it acts slot-ring antenna/ amplitude detector at the design frequency. When the �}45 deg. polarized signal is received, the output voltage of the antenna is either positive or negative according to the diode orientation. Needless to say, the output voltage depends on the diode orientation. The experimental results confirm the orthogonal polarization detection ability successfully.