ONE-SIDE SHORT-CIRCUITED MICROSTRIP ANTENNA

PROBLEM TO BE SOLVED: To keep an interval between a planar radiation conductive part and a ground conductive plate with high precision in parallel by integrally forming a first short-circuited conducting part and the planer radiation conductive part and integrally forming the second short-circuited conducting part and a fixed conductive part. SOLUTION: The first short-circuited conductive part 31 is integrally formed with the planar radiation conductive part 2 and vertically bent in a bending part 3. The second short-circuited conductive part 32 is integrally formed with the fixed conductive part 4 and vertically bent in the bending part 4. The tow short-circuited conductive parts 31 and 32 and partially superimposed so as to be fixed by screws 7. Therefore, the planar radiation conductive part 2 is supported by a dielectric spacer 5 with high measure precision so that the precision of height H in the short-circuited conductive parts 31 and 32 is obtained. Moreover, the interval between the ground conductive plate 1 and the planar radiation conductive part 2 is kept in parallel and the variation of resonance frequencies is restricted together with the high precision of the length L of the planar radiation conductive part 2.