Abstract
We show for high-symmetry disk, square, or equilateral triangular thin microstrip antennas of any composition respectively obeying C∞v, C4v, and C3v point group symmetries, that the transverse magnetic electromagnetic cavity mode wave functions are restricted in form to those that are one-dimensional representations of those point groups. Plots of the common nodal points of the ten lowest-energy non-radiating two-dimensional representations of each of these three symmetries are presented. For comparison with symmetry-broken disk intrinsic Josephson junction microstrip antennas constructed from the highly anisotropic layered superconductor Bi2Sr2CaCu2O8+δ (BSCCO), we present plots of the ten lowest frequency orthonormal wave functions and of their emission power angular distributions. These results are compared with previous results for square and equilateral triangular thin microstrip antennas.
Highlights
Until very recently, there has been a region in the electromagnetic (EM) spectrum from about 0.1 to 10 THz over which compact coherent sources have been difficult to produce, due mainly to output power P values below 1 mW, the approximate value desired for many applications
Resonant tunneling diodes (RTDs) have been able to operate with sufficient power for f < 1.4 THz at room temperature [9, 10], but recently were shown to emit up to 2.0 THz, albeit at P values around 1 μW [11, 12]
By varying the bias V, the output f changes until it locks onto a standing wave mode of that EM cavity, resulting in coherent emission from the stack of intrinsic Josephson junction (IJJ) at f = fc(m, n), where fc(m, n) is the frequency of the EM cavity mode indexed by the two integers (m, n) for the particular cavity geometry, enhancing the output power at that f value [20]-[37]
Summary
There has been a region in the electromagnetic (EM) spectrum from about 0.1 to 10 THz over which compact coherent sources have been difficult to produce, due mainly to output power P values below 1 mW, the approximate value desired for many applications. By varying the bias V , the output f changes until it locks onto a standing wave mode of that EM cavity, resulting in coherent emission from the stack of IJJs at f = fc(m, n), where fc(m, n) is the frequency of the EM cavity mode indexed by the two integers (m, n) for the particular cavity geometry, enhancing the output power at that f value [20]-[37] Two reviews of this phenomenon were recently published [38, 39]. This wave function is even under all three group operations, so it is an example of symmetry type A1.
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