Development of a Novel Uwb Vivaldi Antenna Array Using Siw Technology

Abstract

Abstract-A compact Vivaldi antenna array printed on thick substrate and fed by a Substrate Integrated Waveguides (SIW) structure has been developed. The antenna array utilizes a compact SIW binary divider to significantly minimize the feed structure insertion losses. The low-loss SIW binary divider has a common novel Grounded Coplanar Waveguide (GCPW) feed to provide a wideband transition to the SIW and to sustain a good input match while preventing higher order modes excitation. The antenna array was designed, fabricated, and thoroughly investigated. Detailed simulations of the antenna and its feed, in addition to its relevant measurements, will be presented in this paper.

Design of a Wide Band Eight-Way Compact Siw Power Combiner Fed by a Low Loss GCPW-to-Siw Transition

“…The measured insertion loss results are in very good agreement with the simulated results and show that the designed transition of a 53 mm operates over a bandwidth of 10 GHz with an insertion loss of 0.4 dB. This is a considerable improvement over the previously reported results of about 0.6 dB in [5] over 9-11 GHz and 0.7 dB in [16] at 7-9 GHz for a similar transition designed to operate over a 2 GHz bandwidth. Table 2 categorizes the simulated loss contributions due to metal, dielectric, leakage, and SMA connectors using CST simulation.…”

“…The measured insertion loss of approximately 1.05 dB is better than previously reported results by [1,4], and [16]. The fabricated divider was measured and the insertion loss results of the divider including the SIW-GCPW transitions and SMA connectors at the input and output ports are shown in Figure 10.…”

“…Subsequently, it was predicted that the optimized length of the taper slot is λ/4 at the center frequency (f 0 = 10 GHz) to achieve a wider bandwidth, where λ = λ o / √ ε r [16]. Meanwhile, the design of the SIW transition involves the selection of the substrate properties (i.e., thickness and dielectric constant) which presumably would affect its return loss and insertion loss performance.…”

Broadband Rectangular Waveguide to GCPW Transition

“…However, for many applications, conductor-backed CPW (GCPW) will be needed: the back conductor of GCPW can be used to provide added mechanical support and heat sinking ability compared to conventional CPW [1]. The GCPW can be built on many kinds of manufacturing processes, such as LTCC process [3], integrated circuits process [4], and standard PCB process [5][6][7][8][9]. Due to the advantages of high quality factor and power-handing capacity, the metallic waveguides still play an essential role in millimeter-wave systems.…”

A Compact Inductively Loaded Monopole Antenna for Future Uwb Applications

“…Some of these UWB antennas do not have simple structure (i.e., the radiators is etched on a substrate and placed vertically 0.5 mm above the ground plane [16]) and are not suitable to be integrated with associated UWB electronics. And the typical feeding techniques include slotted structures [17,18,20], CPW feeds [21,22], and simple microstrip lines [23,24,25]. Antenna operation is generally limited within the FCC defined UWB frequency range for these antenna designs.…”