Orthomode Transducers: Part 5 – RF Testing with a Matched Load David W. Porterfield, PhD Founder, Micro Harmonics This is the fifth blog in a series on orthomode transducers [1–4]. In earlier posts, we introduced orthomode transducers (OMTs) and their applications [1], explored several common OMT architectures [2], and outlined the key performance parameters used [...]
Orthomode Transducers: Part 4 – RF Testing with a Short Circuit Termination David W. Porterfield, PhD Founder, Micro Harmonics In previous blogs, we gave a brief introduction to orthomode transducers (OMTs) and their applications [1], showed some of the common OMT architectures [2], and described the important parameters of OMTs, including insertion loss, port reflections, [...]
Orthomode Transducers: Part 3 – Characterization David W. Porterfield, PhD Founder, Micro Harmonics In previous blogs, "Orthomode Transducers: Part 1 – Introduction and Applications" and "Orthomode Transducers: Part 2 – Architectures", we gave a brief description of orthomode transducers (OMTs), discussed some applications, and described some basic architectures. In this third post, we will examine [...]
When MMW Challenges Push the Limits of Design, We Reengineer What’s Possible Micro Harmonics was founded on the clear belief that advancement at millimeter wave (MMW) and terahertz (THz) frequencies requires components designed to resolve industry challenges. We are committed to listening to our customers, learning about their needs, and designing innovative solutions. The pace [...]
Orthomode Transducers: Part 2 – Architectures David W. Porterfield, PhD Founder, Micro Harmonics In our previous blog, "Orthomode Transducers: Part 1 – Introduction and Applications", we provided an preliminary examination of orthomode transducers (OMTs) and their applications. In this post, we will explore the OMT architecture. OMTs have three waveguide ports. Two ports support a [...]
Orthomode Transducers: Part 1 – Introduction and Applications David W. Porterfield, PhD Founder, Micro Harmonics Orthomode transducers (OMTs), also known as polarization duplexers, are waveguide components that combine or separate two orthogonally polarized signals. OMTs have three waveguide ports. Two of the ports support a single propagating mode, typically the TE10 mode in rectangular waveguide. [...]
A mm-Wave Circulator with High Transmitter and Receiver Isolation (Part 2) David W. Porterfield, Ph.D. President and Founder Micro Harmonics Corporation In last month’s blog, I showed why a triple junction circulator offers no advantage over a single junction circulator in isolating a sensitive receiver from a high-power transmitter (S31). I also showed that the [...]
A mm-Wave Circulator with High Transmitter and Receiver Isolation (Part 1) Circulators are used in transmit/receive systems to allow a transmitter and receiver to share a common antenna. A circulator schematic is shown in Figure 1, with typical connections for the transmitter (Tx), receiver (Rx), and antenna (Ant). Figure 1 – Schematic for a circulator [...]
Are Faraday Rotation Isolators Sensitive to Magnetic Fields? Some Faraday rotation isolators are very sensitive to magnetic fields while others show almost no sensitivity at all. It depends on the magnetic bias point. Faraday rotation isolators employ a magnetically biased ferrite rod. An internal magnet or an array of magnets is used to bias the [...]
Do mm-Wave Power Amplifiers Need Isolators? The answer to the question is often yes. It is common to see a mm-wave power amplifier with an isolator attached to the output port. The reason may have less to do with the impedance matching of the amplifier and more with the impedance matching of the load. The [...]
