A PRINTED 2-ARM SPIRAL ANTENNA OPERATING AT THE 90-GHZ BAND

Recently, there has been increased research on millimeter-wave regions due to mobile communication. In addition to the characteristics of hi gh-frequency carrier, an even larger-capacity communication becomes po ssible by making the communication circuits and the antennas broadband . This paper describes a high-frequency broadband printed antenna nece ssary for a monolithic small and lightweight transceiver capable of a large-capacity communication. As a broadband antenna, a two-arm spiral antenna was designed and tested at 90 GHz. At frequencies from 89 GHz through 99 GHz, the antenna pattern and the return loss were measured . In addition, Hallen's integral equation for a linear antenna with an arbitrary shape was analyzed numerically by means of the moment metho d so that the difference between the theory and the measurement was ve rified. Agreement of both is excellent. Hence, the fundamental data ha ve been collected for realization of broadband active integrated anten nas which combine the monolithic circuit and the planar antenna.