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The substrate integrated waveguide (SIW) plays a very important role in millimetre-wave and microwave integrated circuits and systems with low return loss and high Q-factor. Also, the half-mode substrate integrated waveguide (HMSIW) has been developed in recent years. A new Y-junction four-way power divider is proposed by integrating the 90° Y-junction SIW power divider and HMSIW power divider. Simulated and measured results show that the return loss of the input port is below -15 dB over 8.6 to 12.2 GHz and transmissions are about -7.6 dB ± 0.2 dB in the passband. So, it makes the 6 dB power divider used preferably in a broad bandwidth. The new power divider can be produced in batches and can be widely used in millimetre-wave and microwave circuits owing to its simple and novel structure.
Introduction: The microwave power divider has been widely used in many microwave and millimetre-wave systems as a key element in multiplexer, coupler and antenna feeding systems etc. Especially in microwave and millimetre-wave integrated circuits, the feeding system of a microstrip array antenna needs a power divider with low loss, high Q-factor and broad bandwidth. The conventional rectangular waveguide power divider can meet these requirements. However, the rectangular waveguide components often cannot satisfy the size and it is difficult to be integrated with microwave and millimetre-wave planar circuits. The substrate integrated waveguide (SIW) is a new kind of microwave transmission structure, which has appeared in recent years [1 -7]. This structure has the advantages of a rectangular waveguide and microstrip, and can be easily integrated with different planar transmission lines, such as microstrip and coplanar waveguides. Additionally, the halfmode SIW (HMSIW) has been developed in recent years [8- 11]. Compared with a SIW, an HMSIW reduces size by almost 50% and achieves a similar capability with the same manufacture. In this Letter, a new kind of...