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The via filling technique was used to build tunable BST, BZT ferroelectric material capacitors to control phase shift. This phase shifter has the advantages of meta- material structures, which produce little phase error and compensation while having the simultaneous advantage of using LTCC technology for embedding passive components that improve signal integrity (several signal lines, power planes, and ground planes) by using different processes like via filling, screen printing, laminating and firing that can be produced in compact sizes at a low cost. The proposed design and implementation in this research introduce new types of tunable meta- material phase shifters embedded inside LTCC, which use BST and BZT as capacitive tunable dielectric material controlled by changing the applied voltage. Two of the most promising ferroelectric materials in microwave applications are BST and BZT. Tunable ferroelectric materials have been investigated, since they offer the possibility of lowering the total cost of phased arrays. They are used in synthetic aperture radars (SAR), low earth orbit (LEO) communication satellites, collision warning radars, and intelligent vehicle highway systems (IVHS), in addition to various other applications. They are essential components for active and passive phased array antennas and their most common use is in scanning phased array antennas. Microwave phase shifters have many applications in microwave devices. Tunable ferroelectric capacitors, zero meta- material phase shifters, and tunable meta- material phase shifters are presented. This dissertation describes electrically tunable microwave devices utilizing low temperature co-fired ceramics ( LTCC) and thick film via filled with the ferroelectric materials barium strontium titanate (BST) and barium zirconate titanate (BZT). Tunable ferroelectric meta- material phase shifter embedded inside low temperature co-fired ceramics ( LTCC) Using the effective dielectric constant of a heterogeneous layered dielectric structure, results from Method of Momentum (MoM) electromagnetic simulations are consistent with the experimental observations.« less The base dielectrics of commercial low temperature cofired ceramics ( LTCC) systems have a temperature coefficient of resonant frequency ( compensation is achieved when the compensating dielectric is integrated next to the SL. Localized temperature stability in Low Temperature Cofired Ceramics ( LTCC).