What is the exact meaning of Mizbe'ach Miktar Ketores"?
Rashi: It means a Mizbe'ach for the smoke of incense ascends. 1
Targum Onkelos and Targum Yonasan: It means a Mizbe'ach to bring on it incense.
Rashbam: It also implies that it is to burn Ketores exclusively, and not Shelamim, Olos and Nesachim. 2
Why did the Torah not list the Mizbe'ach ha'Ketores in Terumah (together with the Shulchan and the Menorah, as it does in Shemos 37:25)?
Ramban and Seforno: Having concluded "ve'Nikdash bi'Chevodi. ve'Shachanti ... ", 1 the Torah now adds that there is an additional K'li that is required, on which one sacrifices the Ketores purely in order to honor Hashem, 2 as opposed to the other Keilim listed in Terumah, which were instrumental in bringing the Shechinah down to the world. 3