Hi Ivan,
Actually in the implementation we are going to treat
on the website zipcode as a password field. we are
asking people to enter username and zipcode which is
store in the LDAP Schema.

In the radius, I am going to receive username
(User-Name) and zipcode ( User-Password). In the ldap
module do query
filter =
"(&(uid=%{Stripped-User-Name:-%{User-Name}})(entitlements=WIFILOC1)(zipcode=%{User-Password}))"

and depends on the resultset, give access or reject.

Please let me know if this clear and any other better
way to handle this in radius.

Couldn't you just map zipcode to the password attribute in ldap.attrmap:

checkItem Cleartext-Password zipcode

you could then exclude the zipcode condition from your ldap filter as FreeRADIUS should do the work.