Abstract
To realize multi-band mode conversion in a high-power microwave incoherent power combination system, a tri-band conversion system (at X-, Ku-, and Ka-bands) is proposed in this paper. The tri-band conversion system mainly consists of three parts: a dual-band multiplexer, a circular waveguide with a 90° bend, and a tri-band mode converter. To investigate the mode coupling characteristics in the system, every part is carefully analyzed and verified. Numerical and simulation results show that the final conversion efficiencies of the conversion system are 98.9% [coaxial transverse electromagnetic (TEM) mode–coaxial TE11 mode at 10.16 GHz], 99.1% (coaxial TEM mode–coaxial TE11 mode at 14.45 GHz), and 99.6% (circular TM01–circular TE11 at 30.5 GHz). Meanwhile, its maximum power handling capacities reached 1.5 GW, 957.6 MW, and 726.2 MW. The good agreement between theoretical analyses and simulation results demonstrates that the proposed tri-band system is feasible in high-power microwave applications.
Highlights
High-power microwave (HPM) techniques have been extensively applied in many military and civil applications, such as space debris detection and directed-energy weapons.1–4 limited by material and technology, the output power capacity of a single HPM source is usually at the gigawatt level,5–8 which still cannot satisfy some special applications with higher power
The output mode of the HPM source is normally the coaxial transverse electromagnetic TEM mode or the TM01 circular waveguide mode, and they both have donut shape patterns, which are unsuitable for direct applications
To satisfy the demand of power combination at different frequency bands, a dualband coaxial waveguide converter with a dual-channel structure, in which a cir.TM01–cir.TE11 converter was properly inserted into a coa.TEM–coa.TE11 converter, was designed as shown in Ref. 17, and its outer and inner converters operate at L- and C-bands, respectively
Summary
High-power microwave (HPM) techniques have been extensively applied in many military and civil applications, such as space debris detection and directed-energy weapons. limited by material and technology, the output power capacity of a single HPM source is usually at the gigawatt level, which still cannot satisfy some special applications with higher power. To satisfy the demand of power combination at different frequency bands, a dualband coaxial waveguide converter with a dual-channel structure, in which a cir.TM01–cir.TE11 converter was properly inserted into a coa.TEM–coa.TE11 converter, was designed as shown in Ref. 17, and its outer and inner converters operate at L- and C-bands, respectively. It has an asymmetric structure, in which the excited asymmetric interference modes are hardly suppressed especially in high frequency applications, such as those at the Ka-band.
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