I have a few ranger spells to offer. They aren't all smite-esq, so let me know if they aren't really what you're interested in.
I like the idea of using ranger spells to reinforce the "expertise " of the ranger, trying to match the spell with skill.
Sniper’s Shot
Cantrip
You make a ranged attack against a target within your weapons long range as part of casting this spell. You do not suffer the normal range penalties for long range, or you may ignore bonuses from less than full cover if the target is within normal range.
Against your Favored Foe: You may apply Hunter's Mark as a reaction before the attack roll is resolved. You must use a spell shot as normal to cast hunters mark)
(This assumes a 2014 ranger feature. You could probably just let this apply hunters mark. Also, I think they have some free HMs that they should be allowed to use.)
Suppressing Fire
2nd level
Action
Duration: 1 round
Brandish a piece of ammunition or weapon. Create a 30 ft cone. Any creature in the cone at the time of casting, it that enters the cube must make a Dexterity saving throw. On a fault, that take 3d8 damage of a toe based on the brandish item. On a success, they take only half damage.
Prowling Hunter
3rd(?) level Spell
Duration: 1 minute
You channel magic to heighten you senses, gaining +10 ft of dark vision (adding if you don't have it). You also gain benefits based on your fighting style(s):
Archery: No longer suffer disadvantage when an enemy is within 5 ft
Blind Fighting: Your Blind sight increases to 20ft. Additionally, you gain advantage on all perception checks that rely on sight.
Defense: You gain the uncanny dodge ability as described in the Rogue's abilities section
Dueling: As part of the attack action, you may make a 10 ft lunge. This lunge consumes movement, but does not provoke Opportunity attacks.
Thrown Weapon Fighting: no idea what to put here
Two Weapon Fighting: You become a whirlwind of weapons. You may make all attacks as if they had the Cleave mastery applied, in addition to your other weapon masteries.
This one is obviously half baked. Poorly balanced and not feature complete, but I'm trying to emphasize the fighting styles better.