Some experimental investigations on electromagnetically coupled microstrip antennas on two‐layer substrates

Abstract

The results of some experimental investigations on electromagnetically coupled microstrip antennas on two‐layer substrates are reported in this article. The variation of input impedance of electromagnetically coupled square and circular microstrip patches, with the degree of overlapping between the patch and feedline, is studied. Also presented is the percentage shift of resonance frequency due to the change of this overlapping. A method of increasing the 1:2 V.S.W.R. bandwidth of the patch antenna is also indicated.

Design of a Circularly Polarized Microstrip Antenna for Wlan

“…Current research works also include miniaturized multiband short circuited microstrip antennas [9][10][11] and wideband proximity coupled microstrip antennas [12][13][14][15][16][17][18]. Single layer microstrip antennas have very narrow bandwidth, but using multi-layered configurations like proximity coupled microstrip antennas or aperture coupled microstrip antennas, higher bandwidth can be achieved [12][13][14][15][16][17][18]. Design and development of compact printed antennas for wireless communications are also reported [19][20][21][22][23][24][25][26][27][28].…”

Compact and Broadband Microstrip Antennas for Next Generation High-Speed Wireless Communication Using HIPERLAN/2

“…The mainaimof nextgeneration wireless communication is high-speed networking service for multimedia communication.The most important high-data-rate wireless broadband networking systems for next generation wireless communications areEuropean Telecommunications Standards Institutes (ETSI) High Performance Local Area Network type 1 (HIPER-LAN/1), and High Performance Local Area Network type 2 (HIPERLAN/2) which uses the frequency bands 5.150 GHz-5.350 GHz and 5.470 GHz-5.725 GHz, respectively, with omnidirectional antennas [1]. The modern wireless communication systems requirethe antennas for different systems and standards with characteristicslike compact, broadband, multiple resonant frequencies and moderate gain.Because of many attractive features, microstrip patch antennas have received considerable attention for wireless communication applications [2][3][4][5][6][7][8].Single-layer microstrip antennas have very narrow bandwidth, but using two-layer proximitycoupled microstrip antennas higher bandwidth can be achieved [9][10][11][12][13]. The input impedance of a proximitycoupled microstrip antenna is a sensitive function of length and width of the microstrip feed line.…”

Electromagnetically coupled microstrip square/circular ring resonators: Inset/offset feed variation effects on resonance frequency

“…Most of the aforementioned results are reported for direct in-plane feed or coaxial feed where the feed as well as the coupling (between the resonator and feed line) do not have any flexibility in the feed position. Electromagnetic coupled (EMC) microstrip patches are preferred over the direct in-plane or coaxial-feed, because of the advantages such as improved impedance bandwidth, reduction in radiation loss from feeding network, etc [7][8][9]. Specialty of the EMC lies mainly in its flexible feed coupling.…”