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A low profile wideband 16×16 waveguide array with dual circular polarizations is proposed. A 90 degrees hybrid is integrated with the array to obtain the dual circular polarizations. The whole metal structure is adopted to achieve high radiation efficiency. This antenna will be fabricated with Metal 3D Printing.

A millimeter-wave integrated diplexer is introduced utilizing metal insert channel filter technology and E-plane waveguide matching configurations. Special waveguide transformer sections are optimized by using HFSS. Computer-optimized design data are presented in the Ka-band frequency range.

A shared-aperture dual-wideband dual-polarized planar microstrip array is investigated.The operating frequencies are at L- and X-bands. For both bands, stacked patches are selected as the radiating elements to meet the bandwidth requirements. A low-profile design of a planar microstrip array with 2 × 1 L-band elements interleaved with 16 × 8 X-band elements has been achieved. The design is discussed in detail, and the measured results are presented. The measured bandwidth of VSWR < 2 reaches 8.1 and 13% for L- and X-bands, respectively. The measured isolation between the L- and X-band is below −35 dB, and the isolation between the cross-pol ports is below −26 and −24 dB for L- and X-band, respectively. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:486–491, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26579

The Direct Metal Laser Sintering (DMLS) 3-D printing technique is used to fabricate a relatively large 8×8 wideband waveguide array with an integrated corporate-fed network. This DMLS rapid prototyping technique offers the flexibility to fabricate complicated waveguide-based structures with good reliability and high-precision. Experimental results show antenna efficiency is higher than 80% over a wide operation bandwidth and even exceeding 90% at most frequencies. This work demonstrates the 3-D DMLS technique is a promising manufacturing method for the fabrication of complex waveguide antenna arrays.

The aim of this paper was to investigate a hybrid technology that combined striplines and E-plane metallic waveguides for the application of dual-polarized array in Ku-Band. The array was a sandwich structure consisting of multiple metal and substrate layers. The stripline circuits coupled the input power from the E-plane waveguide to form a hybrid structure, which was used to feed the radiators directly to obtain high gain. Here, the design of an efficient waveguide-to-stripline structure was a key issue to the whole feeding network as it was used as main feed line to construct a 4×4 Ku-Band dual-polarization array with circular radiators. Design details of the array and structural realization are given. Result data shows a good agreement between simulation and measurement, which reveals the hybrid structure is a promising technique for wideband and high-gain dual-polarized array application.

A mirror-symmetric hybrid feeding network is proposed in this paper for the design of a dual-polarization high-gain array antenna in Ku-band. The hybrid structure consists of E-plane waveguides and series-feed stripline circuits. Input power is coupled from a simple E-plane waveguide to all stripline branches, which are used to excite the circular waveguide radiators individually. However, for the sake of avoiding long line effect from the series-feed circuits in large array, key issue of equal-phase distribution among radiators should be solved efficiently. Two 8×4 stripline sub-networks are placed in a mirror-symmetric position. Such arrangement could introduce another 180 degree phase difference to compensate the antiphase caused by E-plane T-junction waveguide power divider in the design. In turn, all the radiators could be fed in equal-phase. The hybrid feeding network has been realized on an 8×8 array. Design details of the feeding network and array structure are given. The mirror-symmetric hybrid structure can be considered as a good candidate for dual-polarized large array application.

This paper describes the design of a dual-wideband dual linear polarization shared aperture patch antenna. The antenna consists of one antenna element for L-band and an 8×8 planar array for X-band, sharing the same radiation aperture. The array, together with the feeding network is analyzed with HFSS software. The Return Loss, Isolation, and Radiation Patterns of the array are presented. The impedance bandwidth of this antenna array, corresponding to 10dB Return Loss is 13.0% and 14.7% in L- and X-band respectively. The isolation between the orthogonal polarization ports is better than 25 dB and 35 dB in L- and X-band respectively. The cross-polarization is below −22 dB and −25 dB in L- and X-band respectively.