Meandering Microstrip Leaky Wave Antenna With Dual-Band Linear–Circular Polarization and Suppressed Open Stopband

This article proposes a dual-band frequency scanning meandering microstrip leaky wave antenna with linear polarization in the Ku-band and circular polarization in the K-band. This is achieved by making use of two spatial harmonics for radiation. The unit cell of the periodic microstrip antenna contains three meanders with mitred corners. To ensure circular polarization, a theoretical formulation is developed taking into account the delay caused by the microstrip length intervals. It defines the unit cell geometry by determining the length of the meanders to ensure that the axial ratio remains below 3dB throughout the operational band. Moreover, the meanders are used to provide better control over scanning rate (the ratio of change in angle of maximum radiation with frequency) and reduce spurious radiation of harmonics by ensuring single-harmonic operation within the operational band. To guarantee continuous scanning through broadside direction, open stopband is suppressed using mitered angles. The antenna is designed on a 0.254-mm substrate making it suitable for conformal applications. The fabricated antenna shows a backward-to-forward beam steering range of 72° (−42° to 30°) in the K-band (19.4–27.5 GHz) with circular polarization and of 75° (−15°to 60°) in the Ku-band (11–15.5 GHz) with linear polarization.