The phrase 'passive defense' is correct and can be used in written English.
You could use this phrase when talking about a strategy used in combat or other situations where one is trying to defend against attack without actively attacking back. For example: "The army adopted a policy of passive defense to protect against potential invaders."
By the late 4th and 5th centuries, Roman fortresses were being built on easily defensible ground with irregular outlines that conformed to the topography; clearly, passive defense had become the dominant design consideration.
First, consider a routine passive defense.
Radiation sensing is, of course, a passive defense, similar to a fence.
Declarer judged that from West's passive defense, he held the heart ace.
Tunicates largely rely upon the passive defense afforded by their heavy tunic.
"We teach passive defense in Utah," said State Representative Curtis Oda, a Republican from Clearfield.
In addition, the Department of Homeland Security, working with the Department of Health and Human Services, invested heavily in passive defenses against biological attacks, focusing on such programs as Project BioShield and the Laboratory Response Network.
In addition, a variety of computer sciences courses are also offered and include topics such as computer security, network security, active, and passive defenses, data and computer communications, computer and network administration, advanced operating systems, and database systems.
Encrusting sponges and colonial bryozoans are generally considered in modern marine communities to be superior competitors when competing with solitary animals for substrate space [ 109- 111] and the limited passive defenses of living brachiopods make them particularly vulnerable to smothering by other organisms [ 25, 111].
For passive antitank defense the line depended upon natural obstacles, such as rivers and lakes, and upon "dragon's teeth," five rows of pyramid-shaped reinforced concrete projections.
A crowd of 18,555 came to witness the first N.B.A. playoff game in four years at Continental Arena, but it saw the home team come out unsteady in its halfcourt offense and passive on defense as the Nets lost for only the ninth time in 42 home games this season.
