The phrase "a frequent focus" is correct and usable in written English.
It can be used to describe something that is often the center of attention or consideration in a particular context.
Example: "In recent studies, climate change has become a frequent focus of environmental research."
Alternatives: "a common emphasis" or "a regular point of interest".
When Shelley was five, the commune split up, partly because the house was a frequent focus of attacks.
His research is concerned with innovation strategy and management, with a frequent focus on the energy and manufacturing sectors.
Professor Lester's research is concerned with innovation strategy and management, with a frequent focus on the energy and manufacturing sectors.
The visual appeal extends even further, in contrast to the typical concert video, with a frequent focus on the players' antique instruments.
Although Cherry will not play today against the Eagles unless the game is a rout, he found himself a frequent focus of conversation this past week.
— Local issues are a frequent focus for students at High Tech High, a network of public charter schools in San Diego, where P.B.L. is incorporated across the curriculum.
Discussions regarding the outcome of knee arthroplasty frequently focus on the implants used and the surgical technique employed, with a less frequent focus on patient profile.
During the 1990s the World Bank became a more frequent focus of WFP attention as such multilateral institutions promoted neoliberal policies (those leading to a free flow of trade and investment and a reduction in the role of the state).
As Africa has gotten to be a more and more frequent focus for CNN's reporting, even in the US domestic service nowadays, you'd think fundamental mistakes in geography would be high priorities for the network to avoid.
Lewis (1979, 1999), amongst others, provides an alternative to the frequent focus on presenting absolute numbers to describe vulnerability and resilience.
The Sacramento-area seat is a frequent Republican focus.
