There are really good reasons for considering commercial, off-the-shelf (COTS) products rather than custom designs in many technology and application areas. Indeed considering COTS is mandatory for many organisations and even enshrined in law for US government procurement.¹
The main reasons for using COTS components are rapid availability, low cost and low risk. Clearly in many markets it is far better to buy a product that is in stock, already sold by the thousand and is well proven than to design something special for the purpose.
But this isn’t true for millimeter wave waveguides!Details