Substrate Integrated Waveguide Frequency-Agile Slot Antenna and Its Multibeam Application

Abstract

Abstract-A new technique for designing the substrate integrated waveguide (SIW) frequency-agile slot antenna is presented in this paper. Similar to the metallic waveguide counterpart, the SIW is a uniconductor guided-wave structure and inherently difficult in the electronically tunable applications. To solve this problem, a single slot etched on the top conductor layer of a conventional antenna is instead of two slots to construct an isolated area, which is convenient for the DC bias. The electric length of slots can then be adjusted through two shunt varactors welded near the center of slot. As such, a SIW frequency-agile slot antenna is realized and fabricated to cover the frequency of 2.30 ∼ 2.74 GHz with different bias voltages. Experiments verify our theory analysis and design process. Then, a frequency-agile multibeam antenna is developed to cover several frequency bands while switching between four different radiation patterns pointing at different spatial locations for each frequency. It presents an excellent candidate for software and cognitive radio system applications.

A Compact Wideband Bandpass Filter Using Novel CSRR Loaded Qmsiw Resonator With High Selectivity

“…Then, the traditional non-planar hollow rectangular waveguide can effectively be synthesized into planar substrate with metalized slots or trenches or even arrays of metallic via posts. Compared with other planar components using microstrip or co-planar waveguide (CPW) schemes, SIW components have shown excellent performances such as high Q-factor and low insertion loss [3][4][5][6][7][8], however, which always have much larger size than their microstrip or CPW counterparts.…”

Directional Coupler With Good Restraint Outside the Passband and Its Frequency-Agile Application

“…It also recommends an effective way to avoid the performance degradation due to a cascade connection of two individual components. On the other hand, a number of reconfigurable microwave components, including frequencyagile couplers, have received significant attention because of their selectable fundamental characteristics [7][8][9][10][11][12]. Therefore, we hope to propose and design a 90-degree frequency-agile directional coupler incorporating with the filter's selectivity at each operation frequency band.…”

A Substrate Integrated Waveguide Bandpass Filter Using Novel Defected Ground Structure Shape

“…Substrate integrated waveguide (SIW), early introduced by Wu et al, has attracted plenty of attention and utilized in different applications due to its merits of higher quality factor, easy integration, low cost, high power handling and mass production [1][2][3][4][5]. The half-mode substrate integrated waveguide (HMSIW) has been developed for microwave and millimeter wave applications [6,7].…”