CPC H01P 1/36 (2013.01) [C01G 31/02 (2013.01); C04B 35/495 (2013.01); C04B 37/001 (2013.01); H01B 3/12 (2013.01); H01F 1/0315 (2013.01); H01F 1/346 (2013.01); H01P 1/38 (2013.01); C01P 2006/40 (2013.01); C04B 2235/3217 (2013.01); C04B 2235/3225 (2013.01); C04B 2235/3232 (2013.01); C04B 2235/3239 (2013.01); C04B 2235/3298 (2013.01); C04B 2235/764 (2013.01); C04B 2235/765 (2013.01); C04B 2237/345 (2013.01); C04B 2237/84 (2013.01)] | 20 Claims |
1. A method of forming a composite material for use as an isolator or circulator in a radiofrequency device, the method comprising:
providing a low temperature fireable outer material, the low temperature fireable outer material having a garnet or scheelite structure;
inserting a high dielectric constant inner material within an aperture in the low temperature fireable outer material, the high dielectric constant inner material having a dielectric constant above 30; and
co-firing the lower temperature fireable outer material and the high dielectric constant inner material together at temperature between 650-900° C. to shrink the low temperature fireable outer material around an outer surface of the high dielectric constant inner material to form an integrated magnetic/dielectric assembly without the use of adhesive or glue.
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