Abstract
A novel transmission line model is represented to model bowtie patch antennas. The purposed model uses two slots for modeling the radiation from patch sides. Each radiation slot is presented by parallel equivalent admittance. Also in this model mutual coupling and the effect of slots length limitation as well as the influence of the side slots on the radiation conductance are taken into account implicitly. Admittance and controlled source equations that used for rectangular patch antenna are modified. 1. Introduction These days microstrip antennas are popular and getting more and more attention due to their excellent advantages. Depending upon the applications, microstip antennas having different geometrical shapes are used. In other hand now days researchers are interested in the design and development of compact microstip radiating elements. It can be argued that Bowtie microstip antenna is one of such compact microstrip antennas (2). The Bowtie antenna dose not has a regular geometric shape and hence most of the analytical techniques such cavity model can not be used for antenna's parameter calculation directly. However, popular numerical techniques like method of moment (MOM), finite element method, finite-difference time -domain (FDTD) method, etc., could be used for analysis of such antennas but they are computationally expensive.
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