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½Ç½À 03 − ¾ß±â¾ÈÅ׳ª ¼³°è, Á¦ÀÛ ¹× ÃøÁ¤
1. ½Ç½À¸ñÀû
¤· MWS »ç¿ë¹ý ¼÷´Þ
¤· Yagi ¾ÈÅ׳ª µ¿ÀÛ¿ø¸® ÇнÀ
¤· Yagi ¾ÈÅ׳ª ¼³°è±â¼ú ½Àµæ
¤· Frequency Scaling °³³ä ½Ç½À
2. ±âÃÊ
¤· ¾ß±â ¾ÈÅ׳ª: 1926³â ÀϺ»°úÇÐÀÚ Yagi¿Í Uda¿¡ ÀÇÇØ ¹ß¸í
¤· ±ÞÀüµÈ ´ÙÀÌÆú ÁÖº¯¿¡ ±ÞÀüµÇÁö ¾ÊÀº ´ÙÀÌÆúÀ» ±â»ý¼ÒÀÚ(parasitic elements)¸¦ ¼³Ä¡ÇÏ¿© À̵æÀ» Áõ°¡
¤· ±â»ý¼ÒÀÚ: Á÷Á¢ ±ÞÀüµÇÁö ¾Ê°í ÀÔ»çµÈ ÀüÀÚÆÄ(±ÞÀüµÈ ´ÙÀÌÆú¿¡ ÀÇÇÑ)¿¡ ÀÇÇØ ±â»ý¼ÒÀÚ Àü·ù°¡ À¯±âµÇ¸ç ÀÌ Àü·ù°¡ ¹æ»ç
¤· ±¸Á¶
- ¹Ý»ç±â(reflector) + ±ÞÀü±â(feeder, exciter, driver) + ÁöÇâ±â(director)
- ¹Ý»ç±â: 1°³ ´ÙÀÌÆú ¶Ç´Â ´ÙÀÌÆúÀ» ÀÌ¿ëÇÑ ÄÚ³Ê ¹Ý»ç°æ ÇüÅÂ, ±æÀÌ ¾à 0.48ÆÄÀå
- ±ÞÀü±â: ¹ÝÆÄÀå ´ÙÀÌÆú, ´ÙÀÌÆú ¶Ç´Â folded dipole (Á¾ÀÌ Å¬¸³Çü ´ÙÀÌÆú), ±æÀÌ ¾à 0.46 ÆÄÀå
- ÁöÇâ±â: °¹¼ö¿¡ µû¶ó À̵æ Áõ°¡. °¹¼ö°¡ Áõ°¡ÇÔ¿¡ µû¶ó ÀÌµæ Æ÷È, ±æÀÌ ¾à 0.40 ÆÄÀå
- ¹Ý»ç±â¿Í ±ÞÀü±â: ¾à 0.20 ÆÄÀå
- ±ÞÀü±â¿Í ÁöÇâ±â: 0.075 ÆÄÀå − 0.40 ÆÄÀå (¼³°è¿¡ µû¶ó ´Ù¸§). ±ÕÀÏ °£°Ý ¶Ç´Â ºñ±ÕÀÏ °£°Ý Àû¿ë
- ÁöÁö´ë(boom)ÀÇ ¿µÇâ: ³»±¸¼ºÀ» À§ÇØ ±Ý¼Ó »ç¿ë, ÁöÁö´ë »ç¿ë¿©ºÎ¿¡ µû¶ó ¼ÒÀÚ±æÀÌ Á¶Á¤, ÁöÁö´ë°¡ ÀÖÀ» ¶§ ¹Ý»ç±â¿Í ÁöÇâ±â Å©±â Áõ°¡
- ¼ÒÀÚ¿Í ÁöÁö´ëÀÇ Àý¿¬: ºñÀý¿¬, Àý¿¬
- ¼ÒÀÚ Á÷°æ: ±â°èÀû °µµ¸¦ °í·ÁÇÏ¿© ¼³Á¤. ¼ÒÀÚÁ÷°æ¿¡ µû¶ó ¼ÒÀÚ±æÀÌ ´Þ¶óÁø´Ù.
¤· µ¿ÀÛ¿ø¸®
- ±ÞÀü±â(exciter)¿¡ Àü·ù °ø±Þ
- ÁöÇâ±â(Director¸¦ Ÿ°í ÀüÆÄ°¡ director ¹æÇâÀ¸·Î ÁøÇà
- Reflector´Â ÀüÆÄ°¡ director ¹Ý´ë¹æÇâÀ¸·Î ÇâÇÏ´Â °ÍÀ» ¹æÁö
- ±ÞÀü±â + ¹æ»ç±â
- ±ÞÀü±â + ¹Ý»ç±â + ¹æ»ç±â
3. ¾ß±â¾ÈÅ׳ª ¼³°èÇÁ·Î±×·¥
¤· Yagi Calculator v.2.6.10 by John Drew (VK5DJ), http://www.vk5dj.com/yagi.html
¤· ¹Ý»ç±â(reflector)¿Í ÁöÇâ±â(director)´Â ±Ý¼Ó ÁöÁö´ë¿Í Àý¿¬½ÃŰÁö ¾Ê¾Æµµ µÇ³ª ±ÞÀü±â(exciter)´Â ¹Ýµå½Ã Àý¿¬½ÃÄÑ¾ß ÇÑ´Ù.
¤· ¼ÒÀÚ¼ö¿¡ µû¸¥ À̵æ
À̵æ 10dB: ¹Ý»ç±â 1°³, ±ÞÀü±â 1°³, ÁöÇâ±â 3°³
À̵æ 15dB: ¹Ý»ç±â 1°³, ±ÞÀü±â 1°³, ÁöÇâ±â 10°³
À̵æ 18dB: ¹Ý»ç±â 1°³, ±ÞÀü±â 1°³, ÁöÇâ±â 21°³
4. ½Ç½À
4.1. Yagi Calculator
v.2.6.10 by John Drew (VK5DJ), http://www.vk5dj.com/yagi.html¿¡¼ ¾ß±â ¾ÈÅ׳ª ¼³°èÇÁ·Î±×·¥À» ´Ù¿î¹Þ¾Æ ¼³Ä¡Ç϶ó.
4.2. À§ ÇÁ·Î±×·¥¿¡¼
1) ¼³°è 1
¤· [Task] ¡æ [Design Yagi]¸¦ ½ÇÇàÇ϶ó.
¤· ´ÙÀ½°ú °°ÀÌ ¼³Á¤Ç϶ó. ³ª¸ÓÁö´Â default °ª(¿ø·¡ ¼³Á¤µÇ¾î ÀÖ´Â °ª)À¸·Î Ç϶ó.
Frequency in MHz = 1575
Diameter of dipole bend
mm = 10
Dipole gap at feed point
mm = 2
Number of directors = 4
Cross-section of boom mm
= 2.2 (www.yeeuntech.com YET-085/50-TP »ç¿ë)
Boom type: Round
Construction of
directors/reflector:
Metal shape = Round
Director/Reflector mounting = bonded through
metal boom
Diameter of element(mm) = 2.2 (www.yeeuntech.com YET-085/50-TP »ç¿ë)
Construction of Dipole
Metal shape = Round
Folded dipole mounting = Fully insulated
Diameter of element(mm) = 2.2(www.yeeuntech.com YET-085/50-TP »ç¿ë)
À§¿Í °°ÀÌ ¼³Á¤ÇÑ ÈÄ [Calculate] ¹öưÀ» Ŭ¸¯Ç϶ó. À§ 3.1Ç×°ú °°Àº µ¥ÀÌÅ͸¦ ¾ò´ÂÁö È®ÀÎÇ϶ó.
- ¼³°èµÈ ¾ß±â ¾ÈÅ׳ª Ư¼º: 1575MHz (ÆÄÀå 190m), À̵æ 11dBi, ¼ÒÀÚ Á÷°æ 2.2mm, ÁöÁö´ë Á÷°æ 2.2mm,
ÁöÁö´ë¿Í ¹Ý»ç±â/ÁöÇâ±â ºñÀý¿¬
- Ä¡¼ö
¹Ý»ç±â: ±æÀÌ 92.8, ÁöÁö´ë ÇÑÂÊ ³¡(z = 0)À¸·ÎºÎÅÍ À§Ä¡ z = 3(ÇÁ·Î±×·¥¿¡¼´Â 30À¸·Î ³ª¿À³ª boom ±æÀ̸¦ ÁÙÀ̱â À§ÇØ 30 ¡æ 3·Î º¯°æ)
±ÞÀü±â: ´ÙÀÌÆú »ç¿ë(folded dipole »ç¿ëÇÏÁö ¾ÊÀ½). ±æÀÌ 88.4, À§Ä¡ z = 31
ÁöÇâ±â 1: ±æÀÌ 80.9, À§Ä¡ z = 55.3
ÁöÇâ±â 2: ±æÀÌ 79.9, À§Ä¡ z = 89.6
ÁöÇâ±â 3: ±æÀÌ 78.9, À§Ä¡ z = 130.5
ÁöÇâ±â 4: ±æÀÌ 78.0, À§Ä¡ z = 178.1
2) À§ ¼³°è 1¿¡¼ ´ÙÀ½°ú °°ÀÌ º¯È¸¦ ÁÖ¸é¼ °á°ú¸¦ °üÂûÇ϶ó
- Directors/Reflector
mounting: non metal boom (orf standoffs)
- Construction of
directors/reflector: Diameter of element (mm) = 4.0
- Construction of Dipole:
Diameter of element (mm) = 4.0
À§ °æ¿ì ¸ðµÎ ±ÞÀü±â, ÁöÇâ±â, ¹Ý»ç±âÀÇ ±æÀ̸¸ º¯°æµÊÀ» ¾Ë ¼ö ÀÖ´Ù.
3) À§ ¼³°è 1¿¡¼ ´ÙÀ½°ú °°ÀÌ ÁöÇâ±â ¼ö 40À¸·Î ÇÏ°í °á°úÇ¥¿¡¼ ÁöÇâ±â ¼ö¿¡ µû¸¥ À̵æÀ» È®ÀÎÇ϶ó.
1: 6.9dBi
2: 8.6dBi
3: 9.9dBi
4: 11.0dBi
8: 13.9dBi
12: 15.7dBi
16: 16.9dBi
20: 17.9dBi
30: 19.4dBi
40: 20.4dBi
4.3. À§ ¼³°è 1ÀÇ Ä¡¼ö¸¦ Microwave Studio·Î »ý¼ºÇÑ ÈÄ ¾Æ·¡ ±×¸²À» Âü°í·Î¿Í °°ÀÌ simulationÀ» ¼öÇàÇ϶ó.
4
¤· ´ÙÀÌÆú Ãà x ¹æÇâ, ÁöÁö´ë Ãà z ¹æÇâÀ¸·Î Ç϶ó.
¤· ÁöÁö´ëÀÇ ÇÑÂÊ ³¡À» z = 0À¸·Î Ç϶ó.
ÁöÁö´ë ¹°Áú: PEC
¹Ý»ç±â¿Í ÁöÇâ±â: Á÷°æ 2.2mm solid metal
±ÞÀü±â: Á÷°æ 2.2mm solid metalÀ» ÇÁ·Î±×·¥¿¡¼ °è»êÇÑ ±æÀÌ·Î »ý¼º ÈÄ Áß°£¿¡¼ 2mm ±¸°£À» Á¦°ÅÇϰí discrete port·Î ±ÞÀü, ÁöÁö´ë·ÎºÎÅÍ 1mm À§·Î ¶ç¿ò.
ÁöÁö´ë: Á÷°æ 2.2mm ±æÀÌ 180mm, ÁÂÇ¥ ¿øÁ¡ (z = 0)
ÇØ¼®Á֯ļö: 1000-2000MHz
À̵æ°è»ê Á֯ļö: 1575MHz
±ÞÀü±â ¼ÒÀÚ ¿Ü¿¡ ÁöÇâ±â¿Í ¹Ý»ç±â´Â ÁöÁö´ë(boom)¿¡ Á¢Ã˽ÃŲ´Ù.
¤· ¾ÈÅ׳ª Çü»ó »ý¼º ÈÄ ½Ã¹Ä·¹À̼ÇÀ» ¼öÇàÇ϶ó.
¤· ¾ÈÅ׳ª ±¸Á¶¸¦ µµ½ÃÇ϶ó. (10Á¡)
¤· S11(dB)¸¦
1000−2000MHz¿¡ °ÉÃļ µµ½ÃÇ϶ó. (10Á¡)
¤· S11À»
1000−2000MHz¿¡ °ÉÃļ Smith Chart¿¡ µµ½ÃÇ϶ó.
(10Á¡)
¤· ÀÔ·Â ÀÓÇÇ´ø½º¸¦ 1000−2000MHz¿¡ °ÉÃļ »ç°¢Çü ±×·¡ÇÁ¿¡ µµ½ÃÇ϶ó. (10Á¡)
¤· 1575MHz¿¡¼ ÁöÇâµµ DabsÀÇ 3Â÷¿ø ÆÐÅÏÀ» µµ½ÃÇ϶ó. (10Á¡)
¤· 1575MHz¿¡¼ ÁöÇâµµ DabsÀÇ Àü°è¸é ÆÐÅÏ(phi = 0¡Æ, theta = 0¡Æ−360¡Æ º¯È)À» polar plotÀ¸·Î µµ½ÃÇ϶ó. (10Á¡)
¤· 1575MHz¿¡¼ ÁöÇâµµ DabsÀÇ ÀÚ°è¸é ÆÐÅÏ(phi = 90¡Æ, theta = 0¡Æ−360¡Æ º¯È)À» polar plotÀ¸·Î µµ½ÃÇ϶ó. (10Á¡)
5. Á¦ÀÛ ¹× ÃøÁ¤
5.1 À§ ±×¸²À» Âü°í·Î ¼³°è 1ÀÇ ¾ß±â ¾ÈÅ׳ª¸¦ Á¦ÀÛÇ϶ó. Á¦ÀÛ»çÁøÀ» º¸°í¼¿¡ ÷ºÎÇ϶ó(50Á¡)
5.2 Á¦ÀÛµÈ ¾ÈÅ׳ªÀÇ ¹Ý»ç°è¼ö¸¦ 1000-2000MHz¿¡¼ ÃøÁ¤Ç϶ó(20Á¡)
- |S11|(dB)¸¦ rectangular plotÀ¸·Î µµ½ÃÇ϶ó.
- S11À» ½º¹Ì½º µµÇ¥¿¡ µµ½ÃÇ϶ó.
5.3 Á¦ÀÛµÈ ¾ÈÅ׳ªÀÇ À̵æÀ» ÃøÁ¤Ç϶ó (30Á¡)
6. Âü°íÀÚ·á
¤· 1575MHz 6-¼ÒÀÚ ¾ß±â ´ÙÀÌÆú ¾ÈÅ׳ª ¼³°èµµ¸é
¤· ¾ß±â¾ÈÅ׳ª °øºÎÀÚ·á