| 摘要 |
PURPOSE: To receive the frequency of a fundamental mode and also another different fundamental frequency by preparing a conductor pin which pierces through a ground conductor with no contact with it at a prescribed position set on a radiation conductor of a microstrip antenna. CONSTITUTION: A dielectric substrate 101 uses the synthetic resin PFA that has dielectric constantε(= 2.2), and the core wire 105a of a coaxial probe 105 is connected to a feeding point 106 that is apart from two sides of a batch 102 by distances C and D respectively. A coating wire 105b is grounded at the grounds 103 and 104. A matching pin 1 pierces through the substrate 101 in almost vertical direction and one of both ends of the pin 1 is connected to a contact 2 that is set at a position apart from two sides of the batch 102 by distances E and F respectively. The other end of the pin 1 is located at a position near a point crossing a horizontal plane formed by the ground 103. The ground 103 has an oblong hole 3 which has a prescribed size from the axis of the pin 1 and has no contact with the ground 103. In such a constitution, both a fundamental wave of frequency of 1.575GHz and another fundamental mode frequency of 2.5GHz can be received at a time.
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