Part Number: HPF1810M -- High Pass Filter (LTCC Construction) Pass Band 1900M-5500MHz. SKU#: AK28_001S.
Enclosure uses RF Design Kit with dimension 0.9375"x0.75x0.59". S-Parameter of part measured on VNA (10 MHz to 9 GHz) is shown in third picture.
Proudly Made in USA by Lotus Communication Systems, INC. in Massachusetts (www.lotussys.com).