A novel HF fishbone antenna with vee-element

A novel HF fishbone antenna with V-shape dipoles is introduced. Long V-shape dipoles instead of short linear ones are used as elements to increase the directivity. NEC-2 (Numerical Electromagnetic Code Version 2) is involved to numerically evaluate the radiation characteristics of this new fishbone antenna with two different arm lengths, 12 m and 20 m, respectively. Parameters such as open angle of V-shape dipole, loading resistance, spacing between adjacent dipole and total number of dipoles are optimized according to the simulating results. It is found that the directivity of a fishbone antenna with V-type elements is about 2-5 dB higher at higher frequency band than that of a traditional fishbone antenna. It is also found that the advantages of a traditional fishbone antenna, such as low side-lobe and wide operating band are well reserved in the new design.