When a splitting structure is arranged based on the symmetrical splitting structure, {HEAD ~ a straight waveguide} may be connected to a Y type waveguide element, especially at {TAIL ~ the input waveguide}, which means that a waveguide extending to the outermost output port partially includes a straight waveguide, thus causing the waveguide to become longer 
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When a splitting structure is arranged based on the symmetrical splitting structure , { HEAD ~ a straight waveguide } may be connected to a Y type waveguide element , especially at { TAIL ~ the input waveguide } , which means that a waveguide extending to the outermost output port partially includes a straight waveguide , thus causing the waveguide to become longer
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH