Conclusion
By the preceding section, it is seen that a dual band blade antenna can be polarity diverse as well as dual band. The bands chosen for this example are relatively close in frequency and give a poor example of the power of such a device, yet it nicely illustrates what can be completed. Given enough real-estate, one can cover two very diverse bands with good coverage and opposite polarization.
It also clearly illustrates that the impact of the rectangular slot radiating element is negligible on the radiation pattern of the lower frequency monopole. This is due to the previously mentioned rule of thumb stating it is wise to keep the slot smaller than one-tenth the frequency of operation of the blade. Hence, that frequency does not 'see' the slot.
By combining two elements in this manner, one saves costs in manufacturing and saves real-estate in mounting the antenna. It is noteworthy to mention again that each radiating element must have a different feed structure and most likely a different matching network.
Read more about this topic: Dual-band Blade Antenna
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