Although the ego and the persona are two separate concepts, I believe that they are related concepts.
The ego is the center of our consciousness while the persona is like a mask that we wear. The ego is who most of us think that we are. The persona is that part of us that we show to others.
In our dreams, the ego may make its appearance as the dreamer. The persona?s appearance is often the dreamer?s clothing or lack of it,
The persona is akin to a mask. It is the part of us that we show to others. We all have our own persona. When a persona is weak, we see the person much like as he or she really is. This is shown in our dreams when the dreamer is naked or almost naked. Contrariwise, a person whose dream persona is like a protective shell that is very difficult to penetrate might show his or her dream self as someone wearing inappropriately heavy clothing or even armor. (But, wearing armor does not always mean the same thing. We have to look at the actual content of the dream. As Freud is alleged to have said, "Sometimes a cigar is just a cigar.")
http://www.quotationspage.com/quote/21100.html 
http://webspace.ship.edu/cgboer/mask.gifIf you read different articles on the internet about Jung and his ideas, you will sometimes read that the ego and the persona are archetypes. I?m not so sure about this. Archetypes come from the unconscious while the ego is center of the consciousness.
^^^^^
So, what about the persona? The following is from
http://clinical-psychology.suite101.com/article.cfm/what_is_the_persona According to Jungian analyst Dr. Boris Matthews, "the persona is a functional complex ... that operates as an attitude, or way of relating to, the "outer" world. It serves both as "interface" with the world and protection from the '"outer" world, depending on life experience including how one has been accepted, wounded or rejected when one has naively presented an authentic thought, feeling, or reaction."^^^
As noted above, the persona is a "complex." Our complexes come from the personal unconscious while archetypes come from the collective unconscious. Therefore, the persona can not be an archetype.
