The method of moments and the FDTD method have been widely used for the analysis of radiated electromagnetic fields. In comparison with the FDTD method, the method of moments calculates the electromagnetic field by a light computational load and analyzes the far field accurately. A wire grid model of the printed circuit board placed on the upper plane of the imitated equipment has been reported and it can calculate the electromagnetic field below 1 GHz. However, the wire grid model using the calculation above 1 GHz has not been reported. This paper proposes the analytical model that can analyze the radiated electromagnetic fields with horizontal polarization at frequencies above 1 GHz. Since the contribution of the current on a microstrip line (MSL) is significant in the case of horizontal polarization, the proposed method attempts to simulate the current distribution by inserting impedances and admittances into the wire grid model of MSL. As a result of the studies, it is found that an analysis is possible with an accuracy within ±5 dB of the measured results in the frequency range of 1 to 3 GHz when the current distribution, calculated by the FDTD method, is simulated by inserting inductance and capacitance into the wire grid model. It is also found that the result of calculation by the model is similar to that by the FDTD method, which requires a computation time about 4 times longer. © 2007 Wiley Periodicals, Inc. Electron Comm Jpn Pt 1, 90(8): 20–29, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecja.20354 Copyright © 2004 Wiley Periodicals, Inc.Copyright © 2007 Wiley Periodicals, Inc.