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