Mhz Antenna
loop antenna matching with the following parameters,i wanna know the circuit for impedence matching.?
Q= 20
L= .71664 microH
operating frequency = 13.6 MHz
i want to know how to do the impedance matching, the values of the various circuit component. (capacitor, resistor etc.) and if there is a internet site that can help me with this.
thanx
First, you need to know the impedance of the antenna and the impedance of the system (i.e., transmission line) that you are matching it to. You haven’t really stated the impedance of the antenna in an obvious form. Do you mean that the antenna impedance looks like an inductance of 0.71664 microhenries with a Q of 20? Reading your question, that’s the conclusion I make. If that is true then here is how to match that impedance to a 50 ohm system at 13.6 MHz.
First, change your antenna impedance to a more user friendly form. At 13.6 MHz an inductor of 0.71664 uh has a reactance of X = 2 pi f L = 2 * pi * 13.6e6 * 0.71664e-6 = +j61.24 ohms. Let’s find the series equivalent impedance, so R = X/Q = 61.24/20 = 3.06 ohms. So your series equivalent impedance is 3.06 + j61.24 ohms at 13.6 MHz. By looking at these values it is apparent that this will result in a very narrow bandwidth match.
The next step is to decide what matching network topology you want to use. Your matching network must do 2 things. It must remove the reactive part (+j61.24 ohms) and change the real part (3.06 ohms) to 50 ohms. Certain circuit topologies may do this better than others, and certain circuit topologies will give you more reasonable matching component values than others. This is where lots of experience doing this comes in.
Let’s say we will use a simple 2 element network. You can design this on either a Smith Chart if you know how or using equations for an “L” network. To match on the Smith Chart you could start at the center (50 + j0 ohms) and add components until you arrive at the complex conjugate of the antenna impedance (3.06 – j61.24 ohms). Or you could just plug your source (50 + j0) and load (3.06 + j 61.24) into the appropriate “L” network equations. When I did this I came up with two matching circuits that should do the job and give reasonable component values.
Circuit #1: 50 ohm source – series C = 48.2 pf, shunt C = 144.4 pf – Antenna.
Circuit #2: 50 ohm source – series L = 2.84 uh, shunt C = 236.9 pf – Antenna
Both of these were plugged into a circuit simulator and they do work.
If you were to actually build this you would probably want to make the shunt C adjustable to tune the antenna right on.
BTW, I don’t recommend stub matches at HF. The stubs are too big and lossy. Also, never use resistors in matching networks. All they do is waste power. If you can’t get the match using only L and C values, try a different circuit topology, don’t add a resistor.
|
|
5-209SM-430 Antenna SMA 430Mhz for px-2r vx-350 vx-180 $15.20 |
|
|
5-209SM-145 Antenna SMA 145Mhz for VX-2R VX-170 FT-270R $15.20 |
|
|
Maxrad BMAXSCAN 1000 Scanner Antenna VHF UHF 800 MHZ $15.00 |
|
|
NAGOYA NL-77B DUAL BAND mobile radio antenna 144/430Mhz $17.20 |
|
|
Laird 118-512 MHz VHF Whip Antenna NMO Mount Style $9.95 |
|
|
Maxrad BMAXSCAN1000 Scanner Antenna VHF, UHF & 800 MHz $29.95 |
|
|
10X VHF 136-174MHz Antenna For Motorola Radio GP300 GP320 GP340 GP360 GP380 $23.75 |
|
|
AP-454.3,410-512 MHz On-glass antenna $47.00 |
|
|
MOTOROLA OEM UHF MOTOTRBO GPS ANTENNA – 450-495MHZ $11.75 |
|
|
MTI MT-262001/N 902-928 MHz 9dBi Panel Antenna N-f 12″x12″ 900MHz Patch $24.99 |
|
|
Brand New Sirio SY 27-4 4 elements 26-28 Mhz Yagi Beam Antenna $159.00 |
|
|
MILITARY RADIO HF folding Dipole Antenna 2-30MHz AT-1743 ARMY PRC-174 PRC-74 $165.00 |
|
|
Larsen 150 – 170 MHZ VHF Wide Band NMO antenna SCANNER $3.25 |
|
|
Maxrad BMAXSCAN 1000 Scanner Antenna VHF UHF 800 MHZ $0.06 |
|
|
5x 136-174Mhz VHF Antenna for Motorola Magone A8 $15.99 |
|
|
1000W – 1.8 TO 600 MHZ – Coax Antenna SWITCH – 2 position – Opek CX-201U $29.75 |
|
|
CushCraft 896-960Mhz 3 DB Antennas $8.00 |
|
|
7W Fm Transmitter (76-108Mhz) + power supply + GP antenna [CZH-5C] KITS-Black $95.00 |
|
|
JETSTREAM BALUN, 1:1 TRANSFORMER TYPE, 3.5-30 MHz $29.95 |
|
|
JETSTREAM JTD1 DISCONE SCANNER HAM ANTENNA 25-1300MHz JTD1-NOS $38.95 |
|
|
Tnc male radio Antenna antenne Aerials F33MHZ $8.99 |
|
|
ANTENNA SPECIALIST MAGNATIC ANTENNA BASE 800MHZ K-350T $18.00 |
|
|
Sirio 827 (26.4 – 28.4 Mhz) Tunable 10m & CB Base Antenna $129.00 |
|
|
Lot of 10 Larsen Electronics BSA-470-K Antennas, 470 – 490 MHz, BSA 470 K, BSA47 $9.99 |
|
|
COMET CAR Mobile Antenna SBB-1 PL259 144/430 MHz VHF UHF Dual-Band for HAM radio $47.99 |
|
|
RETECH DUAL BAND 144/430MHz ANTENNA SMA-M YAESU VX-2R VX-3R VX-6R VX-7R FT-60R $11.99 |
|
|
RETECH RHA-701 BNC DUAL BAND 144/430MHz VHF UHF ANETNNA $8.99 |
|
|
Diamond CR-77 2m / 70cm 144/430 MHz Dual-Band Moblie Whip Antenna $44.99 |
|
|
RETECH DUAL BAND 144/430MHz ANTENNA SMA-M VX-2R VX-3R VX-6R VX-7R $8.99 |
|
|
ANTENNA SMA-J Female 144 430 MHz VHF UHF Dual Band for HYT KENWOOD WOUXUN LINTON $8.99 |
|
|
Antenna SMA UHF 400MHz For Motorola 2-way Radio (9cm) $0.95 |
|
|
ANTENNA SMA-Female 430MHz UHF For KENWOOD TK370 TK372 TK380 TK390 TK3180 TK3140 $5.99 |
|
|
Antenna Glass Mount VHF 150-160 MHz NEW $24.95 |
|
|
COMET GP-98 TRI-BAND ANTENNA 144/440/1200 MHZ. $125.99 |
|
|
SWEDCOM PANEL ANTENNA 800-960MHz Model # SC-E6016 rev2 $400.00 |
|
|
SMA Antenna 800MHz For Motorola MT2000 MTX850 XTS3000 $2.29 |
|
|
MAXON VHF Huigh Band Antenna 135-175 MHz $9.95 |
|
|
27MHz Wipe Antenna for Super Radio SS-301 AM/FM/SSB $9.95 |
|
|
Comet Antenna CFM-95SL FM Broadcast 88-108Mhz $109.00 |
|
|
UNIDEN BC246T 800MHZ HANDHELD POLICE FIRE NASCAR RACE SCANNER ANTENNAS BATTERIES $129.99 |
|
|
All Band Scanner Antenna, 3/8 x 24, 25 – 800 Mhz. $13.95 |
|
|
COMET CAR Mobile Antenna SBB3 PL259 144/430 MHz VHF UHF Dual-Band for HAM radio $54.99 |
|
|
NEW UHF Antenna 477mhz 565mm 4.5dB S/Steel Flexible Includes Antenna Cable Kit $61.56 |
|
|
NEW UHF Antenna 477mhz 640mm 4.5dB Fibreglass Flexible Pretuned + Cable Kit $61.07 |
|
|
Uniden NEW PRO630XL 27mhz AM CB Radio 40 Ch + Antenna Front Fire Speaker $197.37 |
|
|
VHF 150MHz Antenna for Motorola Radio GP340 HT1250 Pro $0.99 |
|
|
UHF 400MHz Antenna for Motorola Radio HT1250 GP340 88s $0.99 |
|
|
NEW Uniden UHF CB Radio 477mhz 5W 77ch + Antenna Kit 18km range Warranty – Mini $273.59 |
|
|
Indoor antenna for DCS/1800MHz Mobile Phone Amplifier,Repeater, Booster $18.00 |
|
|
SMA UHF 400MHz Antenna for Motorola Two-Way Radio (9cm) $0.99 |
|
|
20 pcs VHF 136-174MHz Antenna for Kenwood Puxing HYT Radio $27.99 |
|
|
20 pcs 800 MHz Stubby Antenna Motorola MTX8000 XTS5000 JT1000 $36.99 |
|
|
20 pcs 800 MHz long Antenna Motorola MTX8000 XTS5000 JT1000 $38.99 |
|
|
20 x Antenna UHF 400-470MHz SMA-F KENWOOD TK3107 3100 Radio $27.99 |
|
|
New Nagoya BA-6200 144/430Mhz 6.0/8.0dB 200W Base GP (2 Elements) Antenna $59.95 |
|
|
G-RH701SM TAIWAN GOODS SUPER Antenna 144/430MHZ for uv-3r px-325 px-2r kg-uv6d $25.00 |
|
|
G-RH701BNC TAIWAN GOODS SUPER Antenna 144/430MHZ for tk100 ic-v8 ht440 hh152 $25.00 |
|
|
G-RH701SF TAIWAN GOODS SUPER Antenna 144/430MHZ for fd-880 px777 kg-uvd kg659 $25.00 |
|
|
Maxrad 132-174 MHz WIDEBAND VHF Antenna 24Mhz Bandwidth $44.95 |
|
|
Tram UHF 406-512MHz Base Antenna 6.7db Gain 200 Watts $79.95 |
|
|
NEW Andrew (Decibel) DB493-K 6db gain 900MHz Yagi Antenna HAM No Reserve $19.99 |
|
|
Laird Technologies (Antenex) Mobile Load Coil Antenna 896 – 970 MHz $17.50 |
|
|
Bird AT-500 2-520 MHz Antenna Tester Analyzer (New) $1,399.00 |
|
|
Bird AT-800 806-960 MHz Antenna Tester Analyzer (New) $1,399.00 |
|
|
Comet CAA-500 Antenna Tester Analyzer 1.8-500 MHz (New) $449.00 |
|
|
TRAM UHF MOBILE QUARTER-WAVE ANTENNA, 410-490 MHz, WITH MAGNET MOUNT $35.00 |
|
|
SMA-F VHF 150mhz Antenna For Kenwood Radio TK-270 280 290 270G 272G $2.99 |
|
|
VHF 150mhz SMA Antenna For Motorola Radio MV21CV MV22CV MU11 MU11C $2.99 |
|
|
3.5 inch 800Mhz Antenna For Motorola Radio MT2000 MTS2000 LTS2000 STX $2.99 |
|
|
VHF 150mhz SMA Antenna For Motorola Radio GP328 HT750 HT1250 HT1550 $2.99 |
|
|
VHF 150mhz SMA Antenna For Motorola Radio HT1250 P110 CT250 PRO3150 HT1550 $2.99 |
|
|
400Mhz UHF Antenna For Yaesu Radio VX-110 130 150 160 180 210 400 800 $2.99 |
|
|
UHF 400mhz SMA Antenna For Motorola Radio GP328 GP340 GP350 GP380 GP640 $2.99 |
|
|
SMA-F UHF 400mhz Antenna For Kenwood Radio TK-3100 3140 3160 3170 3180 $2.99 |
|
|
UHF 400Mhz Antenna For Motorola Radio MT2000 MTS2000 LTS2000 STX $2.99 |
|
|
VHF 150mhz SMA Antenna For Motorola Radio GP328 GP340 GP350 GP380 GP640 $2.99 |
|
|
150Mhz VHF Antenna For Motorola Radio HT1000 XTS3000 MT2000 $2.99 |
|
|
150Mhz VHF Antenna For Motorola Radio XTS5000 HT2000 JT1000 $2.99 |
|
|
150Mhz VHF Antenna For Yaesu Radio VX-110 130 150 160 180 210 400 800 $2.99 |
|
|
9cm 800Mhz Antenna For Motorola Radio HT1000 HT2000 JT1000 $2.99 |
|
|
VHF 150mhz SMA Antenna For Motorola Radio MU22CVS MU24CVS MU24CVST $2.99 |
|
|
SMA-F VHF 150mhz Antenna For Kenwood Radio TK-2100 2140 2160 2170 2180 $2.99 |
|
|
7 inch 800Mhz Antenna For Motorola Radio HT1000 MTX9250 MTX950 $2.99 |
|
|
UHF 400mhz SMA Antenna For Motorola Radio RDV-5100 2020 RDU 2020 2080D $2.99 |
|
|
UHF 400mhz SMA Antenna For Motorola Radio HT1250 P110 CT250 PRO3150 HT1550 $2.99 |
|
|
SMA-F UHF 400mhz Antenna For Kenwood Radio TK-3200 2302 2312 3302 $2.99 |
|
|
SMA-F VHF 150mhz Antenna For Kenwood Radio TK-2200 2202 2212 2302 $2.99 |
|
|
SMA 150Mhz VHF Antenna For Yaesu Radio VX-110 180 400 800 $2.99 |
|
|
UHF 400mhz SMA Antenna For Motorola Radio Saber IR IIR I II III $2.99 |
|
|
UHF 400mhz SMA Antenna For Motorola Radio CP150 CP200 PR400 SP21 SP50 $2.99 |
|
|
UHF 400mhz SMA Antenna For Motorola Radio CP200 EX500 EX600 PR400 $2.99 |
|
|
VHF 150mhz SMA Antenna For Motorola Radio CP150 CP200 PR400 SP21 SP50 $2.99 |
|
|
UHF 400Mhz Antenna For Motorola Radio HT1000 HT2000 JT1000 $2.99 |
|
|
VHF 150mhz SMA Antenna For Motorola Radio Saber IR IIR I II III $2.99 |
|
|
SMA-F UHF 400mhz Antenna For Kenwood Radio TK-372 373 380 390 370G 372G $2.99 |
|
|
150Mhz VHF Antenna For Motorola Radio GTX XTS 2500 3000 3500 5000 $2.99 |
|
|
Antenna VHF 150MHz For Motorola 2-way Radio GP328 GP380 $3.00 |
|
|
800MHz stubby antenna Motorola radio XTS5000 XTS2500 XTS1500 MTX950 MTX850 $9.99 |
|
|
Tram Browning UHF 450-460MHz Base Antenna 5db Gain NEW $79.95 |
|
|
NEW Antenna Specialists XPD80T 824 to 896 MHz Antenna $15.00 |
Blackcat! Cell Phone Antenna
BLACKCAT! CELL PHONE ANTENNA
The BLACKCAT! Cell Phone Antenna has been solving our customer’s cellular signal problems since 2000. About 4,000 happy customers use it in their homes, offices, metal buildings, boats and vehicles. It has allowed people to eliminate their high-priced, high taxed land-lines.
Why does it work? Cellular signals are the same as your television signals. They are radio frequency signals that just operate at different levels. Just like television signals, cell phone signals simply will not penetrate most building materials.
And just like your television, your cell phone needs help getting the signals from out there to in here, where you want to use it. So, if you can get a signal outside in your yard, we guarantee that the BLACKCAT! Cell Phone Antennawill solve your signal problem, as stated above.
It is omni-directional, meaning the signal covers 360 degrees. It is 16 inches tall and has a 3 inch diameter magnetic base, but it does not have to sit on metal to work, though it will work better that way. It is dual band, meaning it works on both the 800 and 1900 MHz bands. It is quad mode, so it works with analog, digital, PCS, GSM, EVDO, CDMA, TDMA and GRPS.
Yes, it works great with all Air Cards for which an adapter is made. So, if you want to speed up your laptop, plug it into the Air Card. Works great with in-line 3 Watt Amplifiers , too.
View our BLACKCAT! Cell Phone Antenna Products.
BLACKCAT! Antenna Technical Specifications
Part #…………………….
BC-101
Frequency Range…….
824-894 and 1850-1990 MHz
Height……………..
16 Inches
Antenna Gain………….
7 dB
Coax Cable……………
RG58, 10 Feet
Base…………………….
3 Inch Diameter
Polarization…………….
Vertical
Connector……………….
FME Female
BLACKCAT! Antenna Case Histories
Building and Vehicle: I am so excited! Not only are the dead spots on I-20 eliminated, I get great reception inside my tree surrounded, in the country home where I have never had a signal since my old bag phone died. Poor SBC. They just lost a sizeable chunk of long distance charges. Pat
Building: I received the antenna and WOW! I went from no service to two bars digital service. Outstanding! I can now use my cell phone at my house!!! Thank you so much! Sede
Building and Vehicle: I cannot believe how good the antenna works. I can dial out in the living room or use my phone anywhere in the Holly Lake area, even among the tall pines. I would recommend this antenna without reservation. Sam
Camping/Hunting Sites: The antenna works great. I can now hear my husband’s call from all over the North Central Louisiana woods Your staff was very helpful. Libby
Building: Our cell phone would show no service until we installed the antenna. Now it sounds like the person we are talking to is in the room with us. To say we are happy would be an understatement. Eddie (Eddie bought 5-7 more antennas for his RV friends over the next year)
Rural Commercial Vehicle: We are rural contract mail carriers. In some parts of the county there has never been service for me, but with the antenna I am never without service and feel much safer for it. Thank you! Rhonda
Metal Building: The antenna works great. In the window of our metal building it picks up two bars and in the house it gets two more bars than the antenna I was using. Thanks. Larry
Building: The antenna solved our problem using the cell phone in our house. Thanks. Herb
Warranty: This antenna carries a 30 day satisfaction guarantee. We may, at our option, replace it one time, before issuing a refund (if you don’t get a signal in you yard, you likely need a different antenna, so please don’t buy this one). The restrictions on the guarantee are that it must be returned to us in the condition as it was received: in new, saleable condition with no nicks, chips, cuts, bends, etc. It must be received by us with the cable rolled and tied with the ties that come with it, the thread protector in place and in its original packaging. We must receive it in our store within 30 days from receipt by customer. Call the store for an RMA# before returning.
About the Author
UnwiredSignal.com Questions? Call us at the store in Dallas, TX anytime from 9 AM to 6 PM Monday-Friday. We are happy to help you. 214-774-2588 or toll free 888-713-1243.
Freescale introduces industry-first 50 V RF LDMOS power transistor for high-mismatch applications
Freescale Semiconductor today introduced an RF LDMOS power transistor designed for operation from 1.8 to 600 MHz and optimized for use under the potentially-destructive impedance mismatch conditions encountered in applications such as CO 2 lasers, plasma generators, and magnetic resonance imaging (MRI) scanners. The new MRFE6VP6300H FET is the world’s first 50 V LDMOS transistor to deliver full …
