Certain aspects of the present disclosure provide an asymmetric antenna structure. An example antenna device generally includes a first antenna element, a second antenna element, and a flexible coupling element asymmetrically positioned between surfaces of the first and second antenna elements and electrically coupling the first antenna element to the second antenna element.

Certain aspects of the present disclosure provide an asymmetric antenna structure. An example antenna device generally includes a first antenna element, a second antenna element, and a flexible coupling element asymmetrically positioned between surfaces of the first and second antenna elements and electrically coupling the first antenna element to the second antenna element.

Certain aspects of the present disclosure provide an asymmetric antenna structure. An example antenna device generally includes a first antenna element, a second antenna element, and a flexible coupling element asymmetrically positioned between surfaces of the first and second antenna elements and electrically coupling the first antenna element to the second antenna element.

Certain aspects of the present disclosure provide an asymmetric antenna structure. An example antenna device generally includes a first antenna element, a second antenna element, and a flexible coupling element asymmetrically positioned between surfaces of the first and second antenna elements and electrically coupling the first antenna element to the second antenna element.

A transmission line transition that couples RF energy between a coaxial cable and an air dielectric microstrip is provided. In some embodiments, the transition can combine a thin printed circuit board substrate and an insulating surface to form an effective capacitive coupling transition that can couple RF energy from the center conductor of a coaxial cable to an air microstrip. In some embodiments, the transition can include an insulating system affixed to a metallic surface, and the insulating system can secure an airstrip conductor in close proximity to an inner conductor of a coaxial cable to capacitively couple the airstrip conductor to the inner conductor of the coaxial cable. In some embodiments, the transition can employ a metallic body coated with an insulating surface to capacitively couple RF energy from the center conductor of the coaxial cable to the air microstrip.

A transmission line transition that couples RF energy between a coaxial cable and an air dielectric microstrip is provided. In some embodiments, the transition can combine a thin printed circuit board substrate and an insulating surface to form an effective capacitive coupling transition that can couple RF energy from the center conductor of a coaxial cable to an air microstrip. In some embodiments, the transition can include an insulating system affixed to a metallic surface, and the insulating system can secure an airstrip conductor in close proximity to an inner conductor of a coaxial cable to capacitively couple the airstrip conductor to the inner conductor of the coaxial cable. In some embodiments, the transition can employ a metallic body coated with an insulating surface to capacitively couple RF energy from the center conductor of the coaxial cable to the air microstrip.

A transmission line transition that couples RF energy between a coaxial cable and an air dielectric microstrip is provided. In some embodiments, the transition can combine a thin printed circuit board substrate and an insulating surface to form an effective capacitive coupling transition that can couple RF energy from the center conductor of a coaxial cable to an air microstrip. In some embodiments, the transition can include an insulating system affixed to a metallic surface, and the insulating system can secure an airstrip conductor in close proximity to an inner conductor of a coaxial cable to capacitively couple the airstrip conductor to the inner conductor of the coaxial cable. In some embodiments, the transition can employ a metallic body coated with an insulating surface to capacitively couple RF energy from the center conductor of the coaxial cable to the air microstrip.

A transmission line transition that couples RF energy between a coaxial cable and an air dielectric microstrip is provided. In some embodiments, the transition can combine a thin printed circuit board substrate and an insulating surface to form an effective capacitive coupling transition that can couple RF energy from the center conductor of a coaxial cable to an air microstrip. In some embodiments, the transition can include an insulating system affixed to a metallic surface, and the insulating system can secure an airstrip conductor in close proximity to an inner conductor of a coaxial cable to capacitively couple the airstrip conductor to the inner conductor of the coaxial cable. In some embodiments, the transition can employ a metallic body coated with an insulating surface to capacitively couple RF energy from the center conductor of the coaxial cable to the air microstrip.

A broadband quadruple helical circularly-polarized antenna for receiving GNSS signals comprises an excitation circuit and a set of quadruple spiral elements. Each quadruple spiral element consists of four conductors. Each conductor is a one spiral turn of the quadruple spiral element. Said conductors have equal winding angle. The winding angle of all conductors does not change in the same quadruple spiral element. Conductors of neighboring (longitudinally) quadruple spiral elements have different winding angles. The antenna provides a sharp drop in AP at angles near the horizon and a small AP level in the lower hemisphere.

A broadband quadruple helical circularly-polarized antenna for receiving GNSS signals comprises an excitation circuit and a set of quadruple spiral elements. Each quadruple spiral element consists of four conductors. Each conductor is a one spiral turn of the quadruple spiral element. Said conductors have equal winding angle. The winding angle of all conductors does not change in the same quadruple spiral element. Conductors of neighboring (longitudinally) quadruple spiral elements have different winding angles. The antenna provides a sharp drop in AP at angles near the horizon and a small AP level in the lower hemisphere.