This paper presents the design of a high isolation
miniaturized compact diplexer model based on Band-Pass Filter
technique, which is intended especially for a lower band
[1.7 GHz to 1.9 GHz] fixed for 4G-LTE and a
higher band [3.4 GHz to 3.8 GHz] fixed for
5G Sub-6 GHz. The designed diplexer is very compact with an overall
size of 11× 36.49 mm2. The proposed design
method is implemented by directly combining two band pass filters
(BPFs) with separated electric and magnetic coupling distribution
and designed with planar structures on a Rogers RT/duroid 6010LM
substrate with a relative dielectric constant of 10.2, which
simplifies significantly the design process of diplexer. The
performance of this structure is presented and discussed in terms of
its important characteristics: Impedance matching, Transmission
losses and Isolation. Good agreements between simulated and measured
results are achieved, which successfully verifies the proposed
design method.
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