Abstract
Two filtering antennas implemented on the dual-mode cavities are proposed, investigated and experimentally verified in this paper. They are developed based on the single-layer substrate integrated waveguide (SIW) technology. The rectangular SIW dual-mode cavities (using TE102, TE201 and TE301 modes) are effectively stimulated with a simple capacitive feeding near the diagonal line of the cavity. Surface current distribution is firstly analyzed for the optimal positions of slot radiators. Two rectangular slots are etched on the top surface of the SIW cavity, which are used to interfere the original current flow of one particular mode and generate radiation. These orthogonal dual-modes are used to obtain a filtering response. Their resonance frequencies are close to each other leading to field rotation and interaction with a radiation null generated outside the passband. The radiation and filtering function are achieved simultaneously by the dual-mode cavity, therefore only one cavity is required, resulting in a compact and simple antenna configuration. Good agreement has been observed between the simulation and measurement. They offer a variety of nice features, such as interesting working mechanism, low-profile, high radiation gain and good passband selectivity, which are also suitable for high-frequency antenna application.
Highlights
Several different-type filtering antennas based on substrate integrated waveguide (SIW) technology have been developed and reported in [15]–[19]
In [13], a millimeterwave filtering antenna array has been proposed, where patch array is fed by an SIW four-way anti-phase filtering power divider
In [18], an SIW filtering antenna with a controllable radiation null was presented, in which the null comes from the split-TE101 mode resonators
Summary
A NTENNAS and filters are the key RF/microwave components for the receiver and transmitter subsystems [1]–[6]. Simulated electric field distribution for the dual-mode filtering antenna at (a) 9.93 GHz, (b) 10.02 GHz and (c) 9.76 GHz (radiation null). It is noted that both of the two modes (TE102/TE201) could be clearly observed in the SIW cavity Their resonance frequencies could be controlled by adjusting the cavity geometrical size and the length of slots. Note that by tuning the size of cavity, the resonance frequency of TE201 mode could shift to higher transition band, so the radiation null could shift to the right side of the passband. The measured and simulated boresight gain is 6.92 dBi and 7.29 dBi, while the cross-pol. component is very low and well suppressed
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
