Microstrip‐line‐fed elliptical wide‐slot antenna with similar parasitic patch for multiband applications

Abstract

This study presents two design improvements over conventional microstrip antenna in terms of multiband operation, gain and cross‐polarisation (XP) level. The first design (Type‐I) consists of a microstrip line on one side and an elliptical slot (ES) on the other side of the substrate. The second design (Type‐II) consists of a parasitic elliptical patch inside the ES in addition to the first design. A theoretical analysis using an equivalent circuit model is performed for both antenna designs for estimating the dimensions of each part of the proposed structures. It is found that the size of the wide ES determines the lower operating frequency, whereas coupling between the parasitic patch and microstrip line decides the multiband operation. Experimental results show that the Type‐I antenna resonates in three frequency bands at 2.49, 3.7, and 9.76 GHz with peak gain and XP level of 8.66 and 44.43 dB, respectively. With proper selection of the dimensions of the parasitic patch, the Type‐II antenna generates five frequency bands at 1.87, 6.42, 10.76, 12.67, and 13.66 GHz. An exceptionally high gain of 16.79 dB with an XP level of 36.15 dB is reported in Type‐II antenna. The theoretical and simulation results show a good agreement with the measured results.

Loss mechanism of the SISL and the experimental verifications

“…The transmission line is the fundamental component of the RF and millimetre wave circuit and system. The commonly used transmission lines contain microstripe [1], coplanar waveguide (CPW) [2], stripline [3], metallic waveguide [4], substrate integrated waveguide [5], and so on. Recently, a new platform named substrate integrated suspended line (SISL) [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] has been proposed, and it features good properties like low loss, selfpackaging, low cost, and high integration.…”

A high BDR microstrip‐line fed antenna with multiple asymmetric elliptical wide‐slots for wideband applications

“…The even and odd frequencies corresponding to each EWS is tabulated in Table . The detailed description about even and odd modes of an elliptical wide‐slot is given in Reference .…”

“…The antenna structures reported in References are large in size, making them not fit for modern wireless applications. It is seen that the dimensions of the wide‐slot decide the resonant frequency and hence, the overall size of the antenna structure . So, instead of using a single large‐sized wide‐slot, smaller slots are placed at each corner of the wide‐slot, raising the RLBW level up to 3.64 GHz (1.97‐5.61 GHz) in Reference .…”

Design Techniques for Elliptical Micro-Strip Patch Antenna and Their Effects on Antenna Performance

“…3. Use of elliptical parasitic patch has caused improvement in antenna characteristics [28]. A compact antenna for multiband wireless communication was presented and the structure consisted of a wide elliptical slot on the substrate.…”

“…The EMPA finds immense applications in Wireless Local Area Network (WLAN) [11] [12], Ultra Wide Band (UWB) communications [13] [20], GSM1800 (1.71-1.88) GHz, PCS1900 (1.93-1.99) GHz, Multi-band GNNS [14], WiMax communication systems [21], Microwave communications [22], L-band and S-band communications [23] [24], Super Wide Band (SWB) communications [25] [26], Ultra High Frequency (UHF) band communications, GSM900, Radio Frequency Identification (RFID) band communications [27], mobile satellite service, radio astronomy, amateur radio services, C-band communications, X-band communications [28], radiolocation (8.50-10.55 GHz) services [29] and holographic antennas [9].…”