Air gap height 1 Air-gap distance 1 Antenna arrays 1 Antenna design 1 Antenna feeders 1 Antenna structures 1 Beam-steering 1 Feeding lines Feeding networks 1 Main beams 1 Mutual coupling 1 Natural frequencies 1 Off mode 1 PIN diode switches 1 Parasitic element 1 Planar antenna arrays 1 Radiating elements 1 Reflection 1 Semiconductor diodes 1 Simulations and measurements 1 Spurious effects 1 Switch state 1