Filtronic plc is a United Kingdom-based company. The principal activity of the Company is the design and manufacture of broadband microwave and base station filter products for wireless telecommunications systems. Its products include Point-to-Point, Compound Semiconductors and Defence Electronics. Filtronic Broadband Limited designs and manufactures microwave & millimeter-wave products for Point-to-Point radio applications. The product range includes both Transceiver Modules and Waveguide Diplexers. Its subsidiaries include Filtronic Broadband Limited, which is engaged in design and manufacture of microwave products for telecommunication systems, and Filtronic Holdings UK Limited and Isotek (Holdings) Limited, which is a Holding company. Its indirect subsidiaries include Isotek Electronics Limited, Isotek Inc, Isotek Limited and Isotek Hong Kong Holdings Limited. On November 16, 2010, it acquired the share capital of Isotek (Holdings) Limited (Isotek).