Shorting Pins Application in Wide-Band E-Shaped Patch Antenna
Shorting Pins Application in Wide-Band E-Shaped Patch Antenna Shorting Pins Application in Wide-Band E-Shaped Patch Antenna
YoYoC). The goal is to find the pin position where the higherresonant frequency has greater reduction.S11 (dB)0-5-10-15-20Antenna A (predicted)-25 Antenna B (predicted)Antenna C (predicted)Antenna C (measured)-302 2.2 2.4 2.6 2.8 3Frequency (GHz)Fig. 5– Return losses for the reduced size E antenna withthe pin position Yp=33mm and for three antennas: BW260 MHz (antenna A), 350 MHz (antenna B) and 440MHz (antenna C).C. Half E antenna, with pinSimilar to the process employed to a full E antennadescribed on item B, a pin will be applied to the half Eantenna with dimensions L=35mm, W=45mm, Ls=35mm,Ps=6mm and Ws=4mm, with h=10mm and air dielectric(Fig.6).L- Region ATable 4 presents values and results for the pin in the RegionA. The Fig.7 shows the geometry and Fig.8 is an examplewhen Yp=15mm and Yo=13mm Since the antenna isasymmetrical, three resonant frequencies (F1, F2 and F3) arepresent, where the major reduction of F3 (higher frequency)will indicate the position to apply the pin to minimize size ofthe antenna (Yp=32mm or 13 mm from the back border).Table 4 – Resonant frequencies in Region AYo Yp F1 F2 F3(mm) (mm) (GHz) (GHz) (GHz)43.0 44.0 0.91 1.85 2.8437.0 38.0 0.86 1.79 2.8131.0 32.0 0.84 1.90 2.6425.0 27.0 0.82 2.11 2.6419.0 20.0 0.77 2.30 2.6413.0 15.0 0.71 2.34 2.946.0 7.0 0.67 2.28 3.001.0 2.0 0.62 2.23 3.00Region ARegion BYpYLFeedWXPinYoLsRegion CFeedWPsWsFig.6– Patch geometry, with three regions forthe pin application.L=35 mm and W=45 mm, Region A.The step one, since it is a non symmetrical antenna, willbe to verify which region has the more appropriatebandwidth. These regions are located on the left border(Region A), back border (Region B) and right border (RegionYpPsYoWsFig.7– Half E antenna with the pin anddimensions L=35 mm and W=45 mm, Region A.Ls2009 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC 2009) 232
YoL20-2YpYoS11(dB)-4-6-8-10FeedPinW-12-14-16Ls-180.5 1 1.5 2 2.5 3 3.5Frequency (GHz)Fig.8– Example of the half E antenna with pinand triple resonance (0.71, 2.34 and 2.94 GHz),for Yo=13mm and Yp=15 mm.The same process occur with Regions B (Fig.9) and C(Fig.10), where the major reduction of F3 (higher frequency)indicate the position to apply the pin to minimize size(Yp=34mm or 1mm from the back border to Region B andYp=14mm or 14mm from the back border to Region C).Tables 5 and 6 present respectively resonant frequencies forRegion B and C.- Region BTable 5 – Resonant frequencies in Region BYo Yp F1 F2 F3(mm) (mm) (GHz) (GHz) (GHz)2.0 1.0 0.81 1.74 2.862.0 7.0 0.86 1.72 2.901.5 13.0 0.90 1.71 2.962.0 19.0 0.92 1.71 3.002.0 26.0 0.89 1.71 2.981.5 31.0 0.85 1.71 2.882.0 34.0 0.82 1.73 2.85Ps WsFig.9– Half E antenna with pin and dimensionsL=35 mm and W=45 mm, Region B.- Region CTable 6 – Resonant frequencies in Region CYo Yp Freq.1 Freq.2 Freq.3(mm) (mm) (GHz) (GHz) (GHz)2.0 1.0 0.85 1.73 2.858.5 7.0 0.89 1.75 2.7615.5 14.0 0.92 1.79 2.7620.5 19.0 0.93 1.84 2.7627.0 25.0 0.92 1.88 2.7632.5 31.0 0.89 1.91 2.7939.0 37.0 0.85 1.91 2.9145.0 43.0 0.84 1.92 2.95When the pin positions for the three Regions areobtained, the resulting dimensions of the half E antennasafter simulations are: Region A (L=30mm, W=40mm,Ls=31mm, Ws=6mm, Ps=5mm, Yp=27mm, Yo=16 mm eh=10 mm); Region B (L=30mm, W=40mm, Ls=31mm,Ws=6mm, Ps=4mm, Yp=29mm, Yo=11mm e h=10 mm);Region C (L=30mm, W=40mm, Ls=31mm, Ws=6 mm, Ps=4mm, Yp=14mm, Yo=15 mm e h=10 mm). The feedingposition Yo, shown on Fig. 6, is the same for all Regions.2009 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC 2009) 233
YoL20-2YpYoS11(dB)-4-6-8-10FeedP<strong>in</strong>W-12-14-16Ls-180.5 1 1.5 2 2.5 3 3.5Frequency (GHz)Fig.8– Example of the half E antenna with p<strong>in</strong>and triple resonance (0.71, 2.34 and 2.94 GHz),for Yo=13mm and Yp=15 mm.The same process occur with Regions B (Fig.9) and C(Fig.10), where the major reduction of F3 (higher frequency)<strong>in</strong>dicate the position to apply the p<strong>in</strong> to m<strong>in</strong>imize size(Yp=34mm or 1mm from the back border to Region B andYp=14mm or 14mm from the back border to Region C).Tables 5 and 6 present respectively resonant frequencies forRegion B and C.- Region BTable 5 – Resonant frequencies <strong>in</strong> Region BYo Yp F1 F2 F3(mm) (mm) (GHz) (GHz) (GHz)2.0 1.0 0.81 1.74 2.862.0 7.0 0.86 1.72 2.901.5 13.0 0.90 1.71 2.962.0 19.0 0.92 1.71 3.002.0 26.0 0.89 1.71 2.981.5 31.0 0.85 1.71 2.882.0 34.0 0.82 1.73 2.85Ps WsFig.9– Half E antenna with p<strong>in</strong> and dimensionsL=35 mm and W=45 mm, Region B.- Region CTable 6 – Resonant frequencies <strong>in</strong> Region CYo Yp Freq.1 Freq.2 Freq.3(mm) (mm) (GHz) (GHz) (GHz)2.0 1.0 0.85 1.73 2.858.5 7.0 0.89 1.75 2.7615.5 14.0 0.92 1.79 2.7620.5 19.0 0.93 1.84 2.7627.0 25.0 0.92 1.88 2.7632.5 31.0 0.89 1.91 2.7939.0 37.0 0.85 1.91 2.9145.0 43.0 0.84 1.92 2.95When the p<strong>in</strong> positions for the three Regions areobta<strong>in</strong>ed, the result<strong>in</strong>g dimensions of the half E antennasafter simulations are: Region A (L=30mm, W=40mm,Ls=31mm, Ws=6mm, Ps=5mm, Yp=27mm, Yo=16 mm eh=10 mm); Region B (L=30mm, W=40mm, Ls=31mm,Ws=6mm, Ps=4mm, Yp=29mm, Yo=11mm e h=10 mm);Region C (L=30mm, W=40mm, Ls=31mm, Ws=6 mm, Ps=4mm, Yp=14mm, Yo=15 mm e h=10 mm). The feed<strong>in</strong>gposition Yo, shown on Fig. 6, is the same for all Regions.2009 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC 2009) 233
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