Friis Transmission Equation
.calc-header {
margin-bottom: 30px;
padding: 25px;
background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
border-radius: 12px;
box-shadow: 0 4px 6px rgba(0,0,0,0.1);
color: white;
}
.calc-header h2 {
margin-top: 0;
color: white;
font-size: 28px;
margin-bottom: 10px;
}
.calc-header p {
margin: 10px 0;
opacity: 0.95;
font-size: 15px;
}
.form-section {
margin-top: 20px;
}
.form-row {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 20px;
margin-bottom: 20px;
}
.form-group {
display: flex;
flex-direction: column;
}
.form-group label {
margin-bottom: 8px;
font-weight: 600;
color: white;
font-size: 14px;
}
.form-group input,
.form-group select {
padding: 12px;
font-size: 16px;
border: 2px solid rgba(255,255,255,0.3);
border-radius: 6px;
font-family: 'Courier New', monospace;
background: rgba(255,255,255,0.95);
transition: all 0.3s ease;
}
.form-group input:focus,
.form-group select:focus {
outline: none;
border-color: #4CAF50;
background: white;
box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}
.button-group {
margin-top: 20px;
display: flex;
justify-content: center;
}
.calc-button {
padding: 14px 35px;
font-size: 16px;
background: #4CAF50;
color: white;
border: none;
border-radius: 6px;
cursor: pointer;
font-weight: bold;
transition: all 0.3s ease;
box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}
.calc-button:hover {
background: #45a049;
transform: translateY(-1px);
box-shadow: 0 4px 8px rgba(0,0,0,0.3);
}
.calc-button:active {
background: #3d8b40;
transform: translateY(0);
}
.result-section {
background: white;
border: 1px solid #e0e0e0;
border-radius: 8px;
margin-bottom: 15px;
overflow: hidden;
box-shadow: 0 2px 4px rgba(0,0,0,0.05);
transition: all 0.3s ease;
}
.result-section:hover {
box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}
.section-header {
background: linear-gradient(135deg, #4CAF50 0%, #45a049 100%);
color: white;
padding: 15px 20px;
display: flex;
justify-content: space-between;
align-items: center;
}
.section-header h3 {
margin: 0;
font-size: 18px;
display: flex;
align-items: center;
gap: 10px;
}
.section-content {
padding: 20px;
background: #fafafa;
}
.data-row {
display: flex;
margin: 12px 0;
padding: 10px;
background: white;
border-radius: 4px;
border-left: 3px solid #4CAF50;
}
.data-label {
font-weight: bold;
color: #555;
min-width: 180px;
flex-shrink: 0;
}
.data-value {
color: #333;
font-family: 'Courier New', monospace;
word-break: break-word;
}
.data-value.highlight {
color: #4CAF50;
font-weight: bold;
font-size: 18px;
}
.info-section {
margin-top: 30px;
padding: 20px;
background: white;
border-radius: 8px;
box-shadow: 0 2px 4px rgba(0,0,0,0.05);
border-top: 3px solid #4CAF50;
font-size: 14px;
color: #666;
line-height: 1.6;
}
.info-section h4 {
color: #333;
margin-top: 0;
margin-bottom: 10px;
font-size: 16px;
}
.info-section code {
background: #f5f5f5;
padding: 2px 6px;
border-radius: 3px;
font-family: 'Courier New', monospace;
color: #d63384;
}
.help-text {
margin-top: 15px;
font-size: 13px;
color: rgba(255,255,255,0.9);
background: rgba(0,0,0,0.1);
padding: 10px 15px;
border-radius: 4px;
}
/* Responsive design */
@media (max-width: 768px) {
.form-row {
grid-template-columns: 1fr;
gap: 15px;
}
}
Kalkulator enačb prenosa Friis
Izračunajte prejeto moč pri brezžičnem prenosu z uporabo Friisove enačbe prenosa. Vnesite frekvenco in razdaljo, da določite izgubo poti v prostem prostoru in polmer Fresnelove cone.
Opomba:Friisova enačba prenosa izračuna moč, ki jo prejme antena v idealiziranih pogojih, če druga antena oddaja znano količino moči, ki je oddaljena nekaj oddaljenosti.
O Friisovi transmisijski enačbi
Friisova prenosna enačba povezuje moč, ki jo sprejme antena, z močjo, ki jo oddaja druga antena, ki je ločena z določeno razdaljo. Enačba upošteva ojačanja antene in valovno dolžino signala.
Formula:
Pr / Pt = Gt × Gr × (λ / 4πR)²
kje:
-
Pr= Moč na sprejemni anteni -
Pt= Izhodna moč oddajne antene -
Gr= ojačanje sprejemne antene -
Gt= ojačanje oddajne antene -
λ= valovna dolžina -
R= Razdalja med antenama
Fresnelovo območje:Fresnelovo območje je elipsoidno območje med oddajno in sprejemno anteno. Ta kalkulator izračuna polmer v središčni točki, ki je ključnega pomena za ugotavljanje, ali bodo ovire motile signal.