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Recent advances in the design of orthomode junctions (OMJs) have created new devices capable of achieving as much as a 1:4 bandwidth, while maintaining the high performance of traditional OMJ designs [1][2][3][4][5][6]. The new OMJ technology is based on an inverted-ridge structure, with four symmetrical feeding points for external balanced feeding, stabilizing the frequency dependence of the OMJ.Probes with one or more corrugations on the aperture can greatly enhance the radiated performance in terms of return loss, pattern symmetry, stability with frequency, and minimizing the cross-polar levels within the main beam of the probe. In the standard corrugated-horn literature [7], the upper limit on achievable bandwidth for corrugated horns is often stated to be somewhere between a ratio of 1: 1.5 to 1: 1.8, depending on the performance requirements. New strategies in corrugated-horn design and optimization are therefore required in order to take advantage of the increased bandwidth of the wide band OMJ technology. This paper discusses the achievable performance and limitations of wideband probes with multiple corrugated apertures. It shows measured and predicted design examples of apertures covering up to 1:2 bandwidth in the L-to Ka-band range.

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