Microstrip lines are widely used in the design of planar structures for a number of reasons. One of the main applications is in the development of planar small antennas, i.e. when the device for accommodating the antenna has a restrict area. Each antenna or planar structure, in general, has an Electromagnetic Signature -EMS- that can be determined by scanning the structure appropriately. This work aim at presenting a qualitative method for the EMS determination of planar antennas using TDR - Time Domain Reflectometry - method. ELEKTRONIKA,Gdansk University of Technology,TESPOLCain, F.M., O'neil, G., Antenna designs for notebook computers: Pattern measurement and performance considerations (2012) 8th IEEE International Workshop on Performance and Management of Wireless and Mobile NetworksLiu, L., Wang, W., Shi, D., Gao, Y., Design and performance investigation of a 2.6 GHz dual-element MIMO antenna system for LTE terminal (2012) 6th Asia-Pacific Conference on Environmental Electromagnetics (CEEM)Khaleghi, A., Azoulay, A., Bolomey, J., A dual band back coupled meanderline antenna for wireless lan applications (2005) Vehicular Technology Conferencem, pp. 226-229Chou, L.-C., Wong, K.-L., Kuo, C.-H., A small-size internal dualband metal-strip antenna for 2.4/5 ghz wlan operation in the laptop computer (2008) Antennas and Propagation Society International Symposium, pp. 1-4Kretly, L., Capovilla, C.E., Barbin, S., A novel antenna array based on quasi-yagi element for adaptive wireless system applications (2003) Microwave and Optoelectronics Conference 2003. IMOC 2003. Proceedings of the 2003 SBMO/IEEE MTT-S International, 1, pp. 307-311. , Sept Vol. 1McCabe, S., Scott, J., Impulse tdr and its application to measurement of antennas (2011) Microwave Conference Proceedings (APMC), 2011 Asia-Pacific, pp. 658-661. , DecCataldo, A., Tarricone, L., Trotta, A., Attivissimo, F., Ursol, C., Time domain reflectometry technique for monitoring of liquid characteristics (2005) Antennas and Propagation Society International SymposiumFerrari, P., Flechet, B., Angenieux, G., Time domain characterization of lossy arbitrary characteristic impedance transmission lines (1994) Microwave and Guided Wave Letters IEEE, 4 (6), pp. 177-179Kwak, K.-S., Yoon, T.-S., Park, J.B., Load impedance measurement on a coaxial cable via time-frequency domain reflectometry (2006) SICEICASE 2006. International Joint Conference, pp. 1643-1646Okhowat, M., Fallahi, R., Measurements of antenna reflection coefficients in time domain (2006) Mathematical Methods in Electromagnetic Theory 2006 International Conference on, pp. 328-330Smith, P., Furse, C., Gunther, J., Analysis of spread spectrum time domain reflectometry for wire fault location (2005) Sensors Journal IEEE, 5 (6), pp. 1469-1478Cataldo, A., Monti, G., De Benedetto, E., Cannazza, G., Tarricone, L., Catarinucci, L., A comparative analysis of reflectometry methods for characterization of antennas (2008) Instrumentation and Measurement Technology Conference Proceedings 2008. IMTC 2008, pp. 240-243. , IEEEMohanan, P., Microstrip and printed antennas: Contributions from crema in the last decade (2007) Applied Electromagnetics Conference 2007. AEMC 2007. IEEE, pp. 1-4. , Dec