Multiband feed using coaxial configuration

A compact feed horn with wide‐distributed operating bands of Ku/Ka/W

“…To the best knowledge of us, there are mainly three common methods to realize multiband-characteristics for a reflector antenna: using multiple off-set horns or active electronically scanned arrays reflected by respective sub-reflectors, [2][3][4] adopting frequency selective surfaces (FSS) as its sub-reflectors [5][6][7] with two horns placed to both sides of it, and employing only a single multiband feed horn [8][9][10][11][12][13][14][15][16][17] in a reflector antenna. Comparing with the former solutions, designing a multiband horn comes to a more suitable candidate in the demand for simplicity.…”

“…Comparing with the former solutions, designing a multiband horn comes to a more suitable candidate in the demand for simplicity. Up to now, there are mainly two types of multiband feed horns, that is, multimode horns, 1,8-10 with one cavity and coaxial horns [11][12][13][14] with multiple cavities. Usually, the operating bandwidth of horns with single cavity is limited to 2.7:1, and the use of dielectric rod 15,16 will increase the ratio to 5:1 or more.…”

Wideband turnstile junction coaxial waveguide orthomode transducer

“…Quite a few feed antennas for satellite communication adopted coaxial structures to realize multi-band functions and certain channel isolation: the outer coaxial waveguide propagates lower-frequency signals, and the interior circular waveguide is dimensioned to propagate electromagnetic waves of higher frequency bands. [1][2][3] The determination of single or dual concentric radiation apertures is based on specific frequency separation and electrical performance requirements. In particular, uplink and downlink signals within one band can propagate in the coaxial waveguides simultaneously, which improves the system multi-band function further.…”