PROBLEM TO BE SOLVED: To provide a partial reflection surface antenna that can transmit over a distance which a high-frequency signal can be transmitted and makes it unlikely for the possibility of the high-frequency signal receiving interference, by having two different kinds of arrangements of the antenna array disposed on the surface of the reflecting plate.;SOLUTION: A partial reflection surface antenna 2 mainly comprises a substrate 21, with an upper surface having a signal transmitting notch for transmitting and receiving a high-frequency signal; and a reflecting plate 22 for partially reflecting the high-frequency signal. The reflective plate thereon has a second antenna array and a first antenna array surrounded by the second antenna array, a plurality of support elements that support the reflecting plate on a substrate, and a specified distance is maintained between the reflecting plate and the substrate, wherein the first and second antenna arrays are constituted of a plurality of first microstrip reflecting units 231 and a plurality of second microstrip reflecting units 232, respectively. Also, the distance between the first microstrip reflecting units is smaller than the distance between the second microstrip reflective units.;COPYRIGHT: (C)2007,JPO&INPIT
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