Broad-band reversed-l-shaped antenna

Abstract

Abstract PURPOSE:To widen the frequency band of synthetic input impedance with a passive element roughly coupled, by adding a compensating element to a reversed-L-shaped antenna and then by varying the input impedance of the reversed-L-shaped antenna. CONSTITUTION:Electric current, once fed from input terminal 1, is shunted to radiating element 2 and parallel element 4 to radiate an electromagnetic wave into the air, but part of the electromagnetic wave propagates to passive element 6 to generate electric current on element 6 in proportion to the extent of coupling, so that part of it will be radiated again. When the extent of coupling between the reversed-L-shaped antenna and passive element 6 increases up to >= one tenth, rough coupling should be applied since an influence on directivity increases and, in consequence, mutual interference lessens, so that the frequency band of input impedance can not be widened. For the purpose, compensating element 7 with distribution constants of fine inductance L and fine capacity C is added to vary the input impedance of the reversed-L-shaped antenna, thereby widening the frequency band of the synthetic input impedance.

Inventors

• 👤 Akira Mishima
• 👤 Kazuhiro Kosaka
• 👤 Toyoji Suzuta

Bibliographic Details