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The deterioration in the antenna characteristics that are observed when a single-arm spiral antenna is located in front of a shallow conducting cavity can be mitigated by using an absorbing strip (ABS), which is placed behind the outer arm filaments. The use of lumped resistor elements connected to the arm end results in wideband antenna characteristics similar to those of the spiral with the ABS...
A BOR-SPR antenna is a wideband antenna. This paper presents a modified BOR-SPR antenna, which has the same configuration as the BOR-SPR, except that slots are cut into a conducting parasitic ring (SPR) surrounding a conducting body of revolution (BOR). It is found that the slots generate a stop band in the frequency response of the VSWR, where the center frequency of the stop band is sensitive to...
When a conducting shallow cavity is placed behind an equiangular spiral to obtain a unidirectional beam, the inherent wideband characteristics of the spiral deteriorate. To restore the wideband characteristics, a ring-shaped absorbing strip (R-ABS) is placed under the spiral arms. Analysis of the equiangular spiral with the R-ABS is performed using the finite-difference time-domain method. It is found...
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