On the excitation of higher order modes of an equilateral triangular Dielectric Resonator Antenna

Higher order modes of an equilateral triangular shaped Dielectric Resonator Antenna (DRA) is excited. Higher order TM
₁₀₃
^Z
, TM
₁₀₅
^Z
and TM
₁₁₅
^Z
modes are excited along with fundamental TM
₁₀₁
^Z
mode. It is found that TM
₁₀₁
^Z
, TM
₁₀₃
^Z
and TM
₁₀₅
^Z
modes produce a peak in the broadside direction whereas TM
₁₁₃
^Z
mode produces a null in the broadside direction.