Connections and feeds for broadband antennas

Details Connections and feeds for broadband antennas Connections and feeds for broadband antennas

2006-09-19

2006-09-19

Takaoka, Dean (Department: 2817)

Wave transmission lines and networks

Coupling networks

Balanced to unbalanced circuits

C333S034000, C343S792500, C343S821000

Reexamination Certificate

active

07109821

ABSTRACT:
The present invention relates to connecting and impedance matching a balanced electrical signal, such as that received by an antenna, with an unbalanced transmission circuit, such as that delivered to an amplifier. A planar circuit board is described that delivers signals having opposite polarization collected by different antenna arms to a location for convenient connection to a twin-lead transmission line. Circuit topologies for the circuit board are described that provide relatively low loss and low cross-coupling. A tapered microstrip balun is also described that includes two conducting microstrips on opposing faces of a dielectric separator. Stepped or tapered microstrips at the balanced input port of the balun provide an impedance transforming section electrically connecting to a mode transducing section, in which one of the microstrips tapers outward to form a substantially wider strip. Appropriate choice of parameters is shown to lead to favorable performance in a compact balun.

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Proceedings of the IEEE, vol. 53, Jun. 1965, pp. 647-648.

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