How high is the fence? I only need a rabbit fence 24-28"H so I just use the fencing all the way around and create an entranceway with posts on either side. I secure the fence panel to one post with heavy wire and, depending on the gauge of the fence panel, weave a bamboo pole on the end for extra strength. Secure the "gate" closed with clip on carabiners or clamps.
But I only use the "gate" when I need to bring things in or out with a wheelbarrow or I'm letting my parents or small kids in to enjoy the garden. For everyday use, I just step over it like a hurdle -- it's my leg-lift exercise regimen... And believe me, wearing heavy gardening boots, multiple trips in and out of the various garden areas can leave me burning in the beginning of the season!