Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title:Path loss measurements of Sub-Tera Hz band Date Submitted: March 2009 Source: Young-Chai Ko, Moon-Il Kim, Jun Heo Address [] Voice:[], FAX: [], E-Mail: koyc@kora.ac.kr, mkim@korea.ac.kr, junheo@korea.ac.kr Re: [] Abstract: This is path-loss measurement results in 100GHz – 400 GHz Sub-Tera Hz band. Purpose: Informative Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15. Young-Chai Ko,Korea University

2. Path loss measurements of Sub-Tera Hz band Young-Chai Ko,Korea University

3. Path loss measurements of Sub-Tera Hz band • Path loss measurement in short distance within 1m for the application to WPAN [Doc:15-08-0410-01-0thz]. • Measured frequency band: • 100GHz • 200GHz • 300 GHz • 400 GHz • Acknowledgement • Experiment setup and measurement : Prof. H. Xin from U of Arizona and Moon-Il Kim from Korea University Young-Chai Ko,Korea University

4. Introduction to Measurement Setup • Gaussian beam between TX and RX THz Transmitter THz Receiver Moving Direction Young-Chai Ko,Korea University

5. Measurement Results • Tx/Rx distance ranging from 55.88cm to 76.22cm, with ~1 inch step increment • Loss factor(=relationship between Power(dB) and Distance(dB)) value is close to 2/20cm 55.8cm 1 inch Young-Chai Ko,Korea University

6. Analysis in Frequency Domain 55.88cm reference line, 0 rad • Fourier transformed relative E-field magnitudes and phases for all 8 distances, taking 55.88cm(shortest distance) spectrum as the reference. • Monotonically decrease as the distance increase within ~450 GHz • Phase in good match with plane-wave expected values 55.88cm reference line, 0dB Young-Chai Ko,Korea University

7. Analysis in Frequency Domain Matlab fitted loss factor -1.8683 Matlab fitted loss factor -1.7358 Matlab fitted loss factor -2.1013 Matlab fitted loss factor -1.3869 Young-Chai Ko,Korea University

8. Link Budget Analysis • Link budget where • : transmitted carrier power • : transmitter antenna gain • : path loss • : receiver antenna gain • : receiver implementation losses • : Noise Power calculated as • : Boltzman’s constant • : Receiver noise bandwidth • : Noise figure Young-Chai Ko,Korea University

9. Maximum Allowable Path Loss • Maximum allowable path loss [G. Stuber, Principles of Mobile Communication] • where is the receiver sensitivity which can be calculated as • : received energy per modulated symbol • : Noise spectral density given as • : Data rate in bits per sec • Example with =5dB, =3dB, and =10dBm in room temperature Young-Chai Ko,Korea University

10. Conclusion and Future Discussion • Waveform maxima and field magnitude monotonically decrease as the Tx/Rx distance increases with the path loss of 1dB/10cm. • At least within 1meter, the data rate of 10~20Gbps is possible in the LOS environment. • It is needed to • Measure the path loss beyond 1meter. • Measure the delay profile Young-Chai Ko,Korea University