Use LDAP filter syntax to get AD objects with the ActiveDirectory module installed.

Get-RTADObject.ps1

function Get-RTADObject {
    [CmdletBinding()]
    param(
        [string]$LdapFilter,
        [string]$ComputerName,
        [PSCredential]$Credential
    )

    process {
        if ($ComputerName) {
            $bindingServer = $ComputerName
        } else {
            $bindingServer = [adsi]::new().distinguishedName
        }
        if ($Credential) {
            $binding = New-Object System.DirectoryServices.DirectoryEntry("LDAP://$($bindingServer)", $Credential.UserName, $Credential.GetNetworkCredential().Password)
        } else {
            $binding = New-Object System.DirectoryServices.DirectoryEntry("LDAP://$($bindingServer)")
        }

        $directorySearcher = New-Object System.DirectoryServices.DirectorySearcher($binding)
        $directorySearcher.SearchScope = 'subtree'
        $directorySearcher.PageSize = 1000
        $directorySearcher.SizeLimit = 100000
        $directorySearcher.Filter = $LdapFilter        

        $result = $directorySearcher.FindAll()

        foreach ($item in $result) {
            $object = @{}
            $item.Properties.Keys | ForEach-Object {
                $object[$_] = $item.Properties[$_][0]
            }
            [pscustomobject]$object
        }
    }
}