To create a level playing field the following analysis has been carried out in K6STI's Antenna Optimizer Professional (AOP) version software. AOP is perfect for analysis of loops and bent elements! Each dipole has been tuned for minimum reactance at 144MHz. Segmentation has been set at 25 segments per λ/2 in all examples. The Split Dipole, Folded Dipole and LFA Loop all exhibit their own respective intrinsic impedance...
Meanwhile the V Split Dipole can easily be adjusted to 50Ω by simply changing the swept back angle and tuning out reactance by altering length!
Note that the LFA Loop and V Split Dipole exhibit some pattern distortion (not symmetrical) which has an impact on the final overall pattern when located in a yagi build, LFA Loop being worst of all!
In conclusion it can be seen that rejection of unwanted signals off the ends of the LFA Loop is no better than with a conventional Split Dipole!
|Split Dipole in AOP||Antenna File - Symbolic Dimensions|
|Split Dipole - Average Q-factor = 4.9|
|Folded Dipole in AOP||Antenna File - Symbolic Dimensions|
|Folded Dipole - Average Q-factor = 3.2|
|LFA Loop in AOP||Antenna File - Symbolic Dimensions|
|LFA Loop - Average Q-factor = 2.5|
|V Split Dipole|
|V Split Dipole in AOP||Antenna File - Symbolic Dimensions|
|V Split Dipole - Average Q-factor = 7.1|