Patch end-Launchers-a family of compact colinear coaxial-to-rectangular waveguide transitions

Abstract

Abstract-A new family of structures launching the fundamental mode in rectangular waveguides is proposed. Individual or stacked cavity-backed patch antennas radiate into a rectangular waveguide, providing a good matching with a coaxial input over a wide frequency range. The configuration results in a very compact, colinear transition from a standard coaxial connector to a rectangular waveguide. The components have applications as general-purpose coaxial-to-rectangular waveguide transitions and are well suited for low-profile, phased-array antennas. Experimental results confirm the computational estimations of the proposed components' performance.

A Compact In-Line Waveguide-to-Microstrip Transition in the Q-Band for Radio Astronomy Applications

“…A possible solution consists in the insertion of antennas in the waveguide. In [9], a coaxial-fed circular patch, placed parallel to the waveguide back-short, is presented, with a very compact geometry, but the patch's return loss is only good for part of the X-band. A planar quasi-yagi antenna launcher [10], inserted in the E-plane of the waveguide, with a director element coupled to the microstrip line, provides a quite-flat return loss of 12 dB on a 40% bandwidth (in the X-band).…”

Topology optimization of compact wideband coaxial-to-waveguide transitions with minimum-size control

“…However, wideband transitions typically include complex, bulky 3D structures that can be complicated to mass produce (Yi et al 2011;Bang and Ahn 2014;Tako et al 2014). Simeoni et al (2006) proposed a compact type of coaxial-to-rectangular waveguide transitions that is suitable for mass production by using printed circuit board technology. However, the use of elementary design shapes together with the requirement on compactness make the proposed transitions exhibit narrow frequency band operation.…”

Broadband dual polarized end-launched coaxial transition for dielectric-filled square waveguide

“…An end-fed patch has been used by Simeoni et al [2] to excite an air-filled rectangular waveguide getting a -10 dB reflection coefficient and 10% bandwidth. This bandwidth is increased to 24% by including a parasitic patch.…”