A Micromachined Dual-Band Orthomode Transducer

Abstract

In this paper, an orthomode transducer (OMT) for dual-band operation and optimized for stacked micromachined layers implementation is presented. The proposed design avoids the use of septums, irises, pins, or small features and minimizes the number of equal-thickness micromachined layers required. In this way, the micromachining fabrication is simplified, making the proposed design a very attractive candidate for high frequency applications and for low-cost batch production. A -band dual-band design (one different polarization in each frequency band) with more than 10% fractional bandwidth for each band and 30% separation between bands is presented. In addition, proper routing and layered bends are designed for an optimum standard interfacing with the same orientation of the input/output ports. Two OMTs in a back-to-back configuration are fabricated using a thick SU-8 photo-resist micromachining process. A total of six stacked SU-8 layers, all of them with the same thickness of 635 m, are used. The experimental results are coherent with the tolerance and misalignment of the process, validating the proposed novel OMT design.Index Terms-Dual-band, micromachining, orthomode transducer (OMT), SU-8, -band, waveguide.

Compact Duplexing for a 680-GHz Radar Using a Waveguide Orthomode Transducer

“…However, the septum structure is very difficult to fabricate for 680-GHz operation, and the approaches of [11] and [12] are more appropriate for our situation. These approaches also avoid the use of other critical elements, such as ridges, pines, or small features.…”

“…However, it is interesting to obtain an estimation of the XP-based on rigorous full-wave simulations. According to past knowledge [11]- [13], a key parameter responsible of the degradation of the XP in OMT devices is the misalignment errors between split-block. The XP at the common port of the OMT translates directly into the XP level of the radiation pattern at boresight.…”

Untitled

“…In class I implementation [4]- [7] the through port is symmetric which is used for one mode and a non symmetric side arm which is used for other mode. This is depicted as shown in Figure 1.…”

An x‐band waveguide orthomode transducer with integrated filters

“…Orthomode transducers (OMT) have been widely investigated [1][2][3][4] and are used to split signal polarization. An OMT is employed in the transmitting or receiving of two orthogonally polarized signals (eg, the uplink and downlink paths in satellites), which can double the channel capability.…”