Abstract
In this paper, a mode composite coplanar waveguide (MCCPW) is proposed and studied. The MCCPW can be regarded as a combination of a quasi-coplanar waveguide and a substrate integrated waveguide (SIW). In this composite structure, the center conductor of the quasi-coplanar waveguide serves as the SIW supporting TE10 mode, while the TEM mode operates in the quasi-coplanar waveguide part. The characteristics and design method of the MCCPW are analyzed and illustrated in this work. The MCCPW is fabricated together with two transition structures to demonstrate its integration capability further with other planar circuits. The MCCPW is a single layer structure, and it has the advantages of joint structure and mode composition, which make it a possible solution for multifunction and multiband application systems. The measured and the simulated results agree well with each other, and good transition performances are achieved.
Highlights
With the rapid development of microwave wireless communication systems, there are much demands of compact size high-performance microwave circuits with broadband and multiband functionalities
The unique advantages of the MCCPW are concluded as follows: The mode composite coplanar waveguide will possess the characteristics of structure sharing and high mode isolation due to the enclosing structure of the substrate integrated waveguide (SIW)
One is to serve as the center conductor of the quasi-coplanar waveguide (QCPW) supporting TEM mode, and another is to serve as the SIW supporting TE10 mode higher than its cutoff frequency
Summary
With the rapid development of microwave wireless communication systems, there are much demands of compact size high-performance microwave circuits with broadband and multiband functionalities. A dual-band leaky wave antenna is presented in [7] which needs two-layer substrates for the transmission line itself Based on these reasons, a single layer mode composite transmission line is proposed in this paper by combining the SIW and coplanar waveguide (CPW). Combining the two-waveguide structures to design a new transmission line becomes a reasonable choice It is the original idea of the proposed mode composite coplanar waveguide (MCCPW). The unique advantages of the MCCPW are concluded as follows (which will be demonstrated ): The mode composite coplanar waveguide will possess the characteristics of structure sharing and high mode isolation due to the enclosing structure of the SIW These characteristics will lead to size reduction and high design freedom in future microwave circuits and antennas, especially in multiband application.
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