الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
The diplexer, one of the most crucial components used in RF/microwave transceivers to route signals of two distinct frequencies to the right outputs and prevent cross-channel interference. The demand for small, lightweight, inexpensive, and low-profile antenna has grown dramatically because of wireless communication technology’s rapid development. To meet these needs, microstrip antennas were created. This thesis’ main objective is to develop an effective design for a duplexer with excellent isolations and minimal insertion losses. It is possible to utilize the duplexer for high-speed mobile communication systems since it is based on the integration of the suggested diplexer and antenna. The first section of this thesis introduces a novel layout for a very effective microstrip diplexer. The suggested diplexer works by combining two selective BPFs adjusted to the desired transmit and receive frequencies. The T-junction is used to join the two filters. The suggested diplexer is approved by a satisfactory concordance between the simulated and measured outcomes. The presentation of a wideband, partially ground planed microstrip patch antenna is made in the second section of this thesis. The suggested wide band antenna possesses an impedance bandwidth of 75%. The acquired characteristics of the overall system are very suitable after integrating the proposed diplexer and the proposed wideband antenna element. The suggested full-duplex antenna system attains a compact size of (109×88)𝑚𝑚2, high isolation of −40 𝑑𝐵 in both sides at 𝑓𝑟=1.97 𝐺𝐻𝑧 and 𝑓𝑡=1.82 𝐺𝐻𝑧. In addition to, it has low return losses of −36 𝑑𝐵 at 1.97 𝐺𝐻𝑧 and −38 𝑑𝐵 at 1.82 𝐺𝐻𝑧, together with small frequency space ratio of 𝑟=0.075. The completed full-duplex Tx/Rx antenna system is created as a result, obtaining interesting characteristics. A hardware realization is implemented for the suggested full-duplex antenna system for verification purposes. On the other hand, the for-profit CST Microwave Studio software is employed to produce the simulation results.