This work proposes a novel crossover cavity with high isolation and power handling capability. It consists of a one-pole Substrate Integrated Waveguide (SIW) circular resonator that excites two decoupled evanescent modes at the same resonant frequency. The proposed structure deploys two substrates acting as one evanescent-mode circular cavity. The electric fields of the evanescent modes are confined in the secondary substrate. Meanwhile, most of their magnetic fields exist in the main substrate. Each semicircular post is loaded by a capacitive load ($C_{1}$) in the secondary substrate, defining the resonant frequencies of the excited modes. Moreover, the isolation between channels is controlled through capacitive slots in the top metal layer of the main substrate. Consequently, the resonant frequency of the proposed crossover cavity and the isolation between its channels are independently tuned. The proposed SIW crossover cavity is implemented at 8.7 GHz with a size of (0.65$\lambda_{g}\times $0.65$\lambda_{g}$). A high-power handling capability of 44.7 dBm is measured. Also, 1.7 dB and 64 dB levels of insertion loss and isolation are measured, respectively. Furthermore, a 50-dB isolation bandwidth of 739 MHz is achieved. The scalability of the one-pole crossover cavity to a second-order transfer function has been demonstrated in a simulated two-channel crossover configuration.

This paper details the design and development of a planar switched beam network using 4 × 4 Butler matrix (BM) over a thin and flexible type biocompatible substrate. Four mils thick liquid crystal polymer (LCP) is used as a substrate here (ϵr = 2.92, tanδ = 0.002). The proposed design is centered at 28 GHz, targeting commercial millimeter-wave applications. Floral-shaped antenna with defective ground structures has been implemented as basic radiating elements. The whole structure is based on microstrip line configuration. The architecture occupies an area of 23.85 × 19.20 mm2 over the LCP substrate. Individual components of the BM are detailed here, followed by a system analysis of the whole integrated structure. The present work also covers the electrical equivalent circuit modeling of the whole beam-forming network. The fabricated prototype offers better than 18 dB return losses at each input port for the desired frequency band with 6 dBi (max.) peak gain and 500 MHz bandwidth around the center frequency. Port-to-port isolation of better than 15 dB is achieved with this topology. Experimental and simulated results are in good agreement in all aspects. A comparative study is also chalked out to highlight the significance of the current research work with respect to alike earlier reported structures.

This article argues that “crossover”– a recording artist's movement across the racialized boundaries of commercial music genres and the attainment of a broader consumer base– is central to the history and production logic of the U.S. commercial dance industry. By framing the televised variety show The Jacksons (1976–1977) as a formative production experience for Michael and Janet Jackson and situating it within a genealogy of popular dance on commercial television, I examine how racial and class signifiers were used to appeal to different demographics, highlighting the historical lineages and capitalist foundations of the U.S. commercial dance industry.