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Abstract
Complementary sources concept and half-mode/quarter-mode substrate integrated waveguide (HMSIW/QMSIW) technology are introduced in this paper to improve the back-radiation suppression and bandwidth of microstrip patch antennas (MPAs). The HMSIW cavity as the feeding structure brings an additional resonant frequency to the inherent resonant mode of typical MPAs, which efficiently extends the bandwidth of the MPAs. In addition, while stimulating the MPA mode, the HMSIW cavity drives a monopole by slightly breaking the shorting wall of the HMSIW cavity and loading a printed monopole. The loaded monopole and the equivalent magnetic currents of the MPA construct an orthogonal complementary source model that indicates back radiation suppression. A differential feeding scheme is also employed to enhance the radiation performance. The dual-polarized model, achieved by replacing the HMSIW cavity with QMSIW cavities, is also addressed and even fabricated and tested. The measured results show a differential impedance bandwidth of 15.4% from 1.91 GHz to 2.23 GHz with a differential port-to-port isolation of 38 dB. In the operating band, the average gain is 7.5 dBi, and the front-to-back ratio (FBR) is over 18 dB with a maximum value of 34 dB.
Highlights
DUE to their attractive properties, including low cost, light weight, and ease of integration, microstrip patch antennas (MPAs) have been widely adopted in many modern communication systems [1]
We introduce half-mode/quarter-mode substrate integrated waveguide (HMSIW/QMSIW) techniques [26], [27] to excite MPAs for enhanced bandwidth
A new wideband MPA is proposed in this paper
Summary
DUE to their attractive properties, including low cost, light weight, and ease of integration, microstrip patch antennas (MPAs) have been widely adopted in many modern communication systems [1]. When the MPAs are stimulated, a loaded monopole is fed by the improved HMSIW/QMSIW cavity, so orthogonal complementary sources are constructed to suppress the back radiation [30]–[32]. DIFFERENTIAL HMSIW-FED COMPLEMENTARY MPAs Due to the inherent high pattern symmetry and low cross-polarization performance of the differential antenna, a differential feeding scheme is introduced in these HMSIW-fed MPAs for more obvious analysis of the back radiation suppression characteristics. I is larger than those of the other two From another perspective, as compared in Fig. pattern, the radiation patterns of two reference antennas (Ant. I and Ant. II) exhibit an obvious back lobe, while the proposed differential HMSIW-fed complementary MPA (Ant. III) exhibits obvious zero radiation in the back direction.
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