Abstract
We designed a patch antenna surrounded by a mushroom-like electromagnetic band-gap (EBG) struc- ture and completed it by a partially reflective surface (PRS). EBG suppresses surface waves and creates the bottom wall of the Fabry-Perot (FP) resonator. PRS plays the role of a planar lens and forms the top wall of the FP resonator. The novel PRS consists of a two-layer grid ex- hibiting inductive and capacitive (LC) behavior which allows us to obtain a reflection phase between -180° and +180°. Thanks to this PRS, we can control the height of the cavity in the range from λ/2 to λ/300. Obtained results show that the FP resonator antenna ena- bles us to achieve a low profile and a high-gain. The patch is excited by a microstrip transmission line via the cross- slot aperture generating the circular polarization. Functionality of the described concept of the FP antenna was verified at 10 GHz. The antenna gain was 15 dBi, the impedance bandwidth 2.3% for |S11| < -10 dB, and the axial ratio bandwidth 0.6% for AR < 3.0 dB. Hence, the antenna is suitable for narrowband applications. Computer simulations show that the microwave FP an- tenna can be simply redesigned to serve as a source of circularly polarized terahertz waves.
Highlights
The gain of an antenna can be increased by a partially reflective superstrate (PRS) [1,2,3,4] which behaves like a planar lens
If the planar antenna is surrounded by an electromagnetic band-gap (EBG) structure to suppress surface waves, the PRS and the EBG can form a cavity behaving like a Fabry-Perot (FP) resonator
Many researchers assume infinitely large ground plane and PRS for such an analysis. This assumption is practically valid for very large PRS and ground plane areas, which are in order of 25 2 to 36 2
Summary
The gain of an antenna can be increased by a partially reflective superstrate (PRS) [1,2,3,4] which behaves like a planar lens. A ray method was applied to demonstrate the function of the FP antenna [1] Both the EBG and the PRS are described by complex reflection coefficients exp( j 1) and ρ exp( j 2), respectively. Researching the open literature, we can find the following concepts of circularly polarized Fabry-Perot antennas which have been published recently: In [11], authors presented a single-layer partially reflecting surface antenna with PRS cells consisting of rectangular patches. We describe a novel design of a circularly polarized FP resonator antenna with a two-layer LC superstrate and a mushroom-like EBG structure surrounding the patch. Original approaches used for the design of the presented antenna comprise: An exploitation of a mushroom-like EBG structure surrounding the patch for the suppression of surface waves on one hand, and for forming the bottom plane of the FP resonator on the other hand.
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