What is the expected revenue contribution of the new chip scale packaging technology in calendar 2022 and beyond 
xpect that it could be a significant contributor to both filter volume and revenue in calendar 2022 and beyond. As we have previously discussed, we have dedicated engineering resources to the development of advanced chip scale packaging or CSP and wafer-level chip scale packaging or WLCSP to address the next-generation 5G mobile market. In the beginning of the March quarter, we announced that we had designed and process locked our first WLCSP product and we continue to work toward the qualification of this new packaging technology.
This morning, we announced the introduction of our second chip scale package, one which is suitable across multiple XBAW devices in the end markets and is slated for inclusion in an upcoming WiFi 6E CPE with a Tier 1 enterprise class customer. We have recently taken significant steps to strengthen our supply chain during the March quarter and once qualified and released, both new packages will be able to address the mobile device market across our entire product line, given the significantly smaller footprint of our new packaging solutions, delivering a one-to-one ratio to the size of the die. To summarize our 5G mobile activity, we have multiple customer-funded XBAW filters in design. We have announced three customer engagements, two Tier 1 RF component companies and one leading RF front-end module maker, and all three customer engagements are actively engaged with either our design or manufacturing teams.
And finally, we have just completed the development of our second chip scale package and are working toward creating a more robust supply chain for wafer-level packages in the second half of calendar 2021. Next, I would like to discuss our opportunities in 5G network infrastructure. Wide bandwidth, high-power handling, low insertion loss and high out-of-band rejection are the core filter performance requirements for 5G network infrastructure, Akoustis is ideally positioned to grow its market share in this segment, given our small Form factor solutions and our growing portfolio of RF filters above three gigahertz, where 5G is being deployed worldwide. We are currently designing and/or shipping filters in three main segments of the 5G infrastructure market, including small cell base stations, massive MIMO base stations, and Citizens broadband radio service, or CBRS equipment, the FCC C-Band auction for 3.7 to 3.98 gigahertz spectrum began in December and raised over $80 billion on a new sub 6 gigahertz 5G spectrum in the United States.
This has created yet another 5G network infrastructure opportunity for Akoustis and we expect to demonstrate XBAW filters addressing this new 3.8 gigahertz spectrum in the June quarter. We have several active engagements from OEMs that are targeting rollouts in calendar 2022 and beyond. We continue to ship XBAW filters to our Tier 1 5G small cell network infrastructure customer in support of its initial ramp we have shipped a total of four filter products to this customer and have thus far received three design wins. The production ramp with this customer is presently slower than previously expected given operator driven network deployment priorities and timing changes, but we will continue to expect to ramp production with multiple filters with this customer in the current calendar year.
The ramp timing of our second small cell 5G network infrastructure customer has similarly been affected by operator driven network deployment priorities and timing changes but we expect volume shipments to begin in the second half of calendar 2021. The Citizens Broadband Radio Service, or CBRS, has emerged as a new market for Akoustis after the spectrum auctions that occurred last summer. We continue to believe that the successful utilization of the CBRS bands within the 5G network will require a significant amount of high-frequency filters and recent customer design activity continues to support this thesis. We design locked our first 3.6 gigahertz CBRS XBAW filter in March of 2020 and announced our first order from a distributor in the September quarter to support promotion 
xpect that it could be a significant contributor to both filter volume and revenue in calendar 2022 and beyond. As we have previously discussed, we have dedicated engineering resources to the development of advanced chip scale packaging or CSP and wafer-level chip scale packaging or WLCSP to address the next-generation 5G mobile market. In the beginning of the March quarter, we announced that we had designed and process locked our first WLCSP product and we continue to work toward the qualification of this new packaging technology.
This morning, we announced the introduction of our second chip scale package, one which is suitable across multiple XBAW devices in the end markets and is slated for inclusion in an upcoming WiFi 6E CPE with a Tier 1 enterprise class customer. We have recently taken significant steps to strengthen our supply chain during the March quarter and once qualified and released, both new packages will be able to address the mobile device market across our entire product line, given the significantly smaller footprint of our new packaging solutions, delivering a one-to-one ratio to the size of the die. To summarize our 5G mobile activity, we have multiple customer-funded XBAW filters in design. We have announced three customer engagements, two Tier 1 RF component companies and one leading RF front-end module maker, and all three customer engagements are actively engaged with either our design or manufacturing teams.
And finally, we have just completed the development of our second chip scale package and are working toward creating a more robust supply chain for wafer-level packages in the second half of calendar 2021. Next, I would like to discuss our opportunities in 5G network infrastructure. Wide bandwidth, high-power handling, low insertion loss and high out-of-band rejection are the core filter performance requirements for 5G network infrastructure, Akoustis is ideally positioned to grow its market share in this segment, given our small Form factor solutions and our growing portfolio of RF filters above three gigahertz, where 5G is being deployed worldwide. We are currently designing and/or shipping filters in three main segments of the 5G infrastructure market, including small cell base stations, massive MIMO base stations, and Citizens broadband radio service, or CBRS equipment, the FCC C-Band auction for 3.7 to 3.98 gigahertz spectrum began in December and raised over $80 billion on a new sub 6 gigahertz 5G spectrum in the United States.
 This has created yet another 5G network infrastructure opportunity for Akoustis and we expect to demonstrate XBAW filters addressing this new 3.8 gigahertz spectrum in the June quarter. We have several active engagements from OEMs that are targeting rollouts in calendar 2022 and beyond. We continue to ship XBAW filters to our Tier 1 5G small cell network infrastructure customer in support of its initial ramp we have shipped a total of four filter products to this customer and have thus far received three design wins. The production ramp with this customer is presently slower than previously expected given operator driven network deployment priorities and timing changes, but we will continue to expect to ramp production with multiple filters with this customer in the current calendar year.
The ramp timing of our second small cell 5G network infrastructure customer has similarly been affected by operator driven network deployment priorities and timing changes but we expect volume shipments to begin in the second half of calendar 2021. The Citizens Broadband Radio Service, or CBRS, has emerged as a new market for Akoustis after the spectrum auctions that occurred last summer. We continue to believe that the successful utilization of the CBRS bands within the 5G network will require a significant amount of high-frequency filters and recent customer design activity continues to support this thesis. We design locked our first 3.6 gigahertz CBRS XBAW filter in March of 2020 and announced our first order from a distributor in the September quarter to support promotion 